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Disclosure - Investments - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - Investments - Cost basis, unrealized gains and losses, and fair value of AFS debt securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - Investments - HTM debt securities in unrealized loss position (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - Disclosure - Investments - AFS debt securities in unrealized loss position (Details) link:presentationLink link:calculationLink link:definitionLink 9954503 - Disclosure - Investments - Accrued interest receivable (Details) link:presentationLink link:calculationLink link:definitionLink 9954504 - Disclosure - Investments - Securities sales activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - Investments - Amortized cost and fair value of AFS and HTM debt securities by contractual maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9954506 - Disclosure - Investments - Schedule of Equity Method Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9954507 - Disclosure - Loans and Leases and Allowance for Credit Losses - Major classifications of loan and lease portfolio (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - Loans and Leases and Allowance for Credit Losses - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954509 - Disclosure - Loans and Leases and Allowance for Credit Losses - Loans sold (Details) link:presentationLink link:calculationLink link:definitionLink 9954510 - Disclosure - Loans and Leases and Allowance for Credit Losses - Components of net investment in leases (Details) link:presentationLink link:calculationLink link:definitionLink 9954511 - Disclosure - Loans and Leases and Allowance for Credit Losses - Minimum future lease payments expected to be received from equipment financing lease contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9954512 - Disclosure - Loans and Leases and Allowance for Credit Losses - Loans by aging category and accrual status (Details) link:presentationLink link:calculationLink link:definitionLink 9954513 - Disclosure - Loans and Leases and Allowance for Credit Losses - Nonaccrual loans by loan class (Details) link:presentationLink link:calculationLink link:definitionLink 9954514 - Disclosure - Loans and Leases and Allowance for Credit Losses - Risk category of term loans by vintage year (Details) link:presentationLink link:calculationLink link:definitionLink 9954515 - Disclosure - Loans and Leases and Allowance for Credit Losses - Loans modified under terms of TDR (Details) link:presentationLink link:calculationLink link:definitionLink 9954516 - Disclosure - Loans and Leases and Allowance for Credit Losses - Balance and activity in the ACL by portfolio segment (Details) link:presentationLink link:calculationLink link:definitionLink 9954517 - Disclosure - Premises and Equipment - Summary (Details) link:presentationLink link:calculationLink link:definitionLink 9954518 - Disclosure - Premises and Equipment - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954519 - Disclosure - Derivatives and Hedging Activities - Fair value of derivative financial instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9954520 - Disclosure - Derivatives and Hedging Activities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954521 - Disclosure - Derivatives and Hedging Activities - Effect of derivatives in hedging relationships (Details) link:presentationLink link:calculationLink link:definitionLink 9954522 - Disclosure - Derivatives and Hedging Activities - Carrying Amount and Cumulative Fair Value Hedging Adjustments on Hedged Liability (Details) link:presentationLink link:calculationLink link:definitionLink 9954523 - Disclosure - Derivatives and Hedging Activities - Gains and losses recognized in income on derivatives not designated as hedging instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9954524 - Disclosure - Goodwill and Other Intangible Assets - Carrying amount (Details) link:presentationLink link:calculationLink link:definitionLink 9954525 - Disclosure - Goodwill and Other Intangible Assets - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954526 - Disclosure - Goodwill and Other Intangible Assets - Changes in carrying amount of goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 9954527 - Disclosure - Goodwill and Other Intangible Assets - Estimated aggregate amortization expense for future periods (Details) link:presentationLink link:calculationLink link:definitionLink 9954528 - Disclosure - Servicing Assets and Liabilities - Changes in SBA/USDA loans servicing rights (Details) link:presentationLink link:calculationLink link:definitionLink 9954529 - Disclosure - Servicing Assets and Liabilities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954530 - Disclosure - Servicing Assets and Liabilities - Key characteristics, inputs, and economic assumptions for SBA/USDA loans and related sensitivity (Details) link:presentationLink link:calculationLink link:definitionLink 9954531 - Disclosure - Servicing Assets and Liabilities - Changes in residential mortgage loans servicing rights (Details) link:presentationLink link:calculationLink link:definitionLink 9954532 - Disclosure - Servicing Assets and Liabilities - Key characteristics, inputs, and economic assumptions for residential mortgage loans and related sensitivity (Details) link:presentationLink link:calculationLink link:definitionLink 9954533 - Disclosure - Time Deposits - Contractual maturities of time deposits (Details) link:presentationLink link:calculationLink link:definitionLink 9954534 - Disclosure - Time Deposits - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954535 - Disclosure - Short-term Borrowings and Federal Home Loan Bank Advances - Schedule of Repurchase Agreements are Secured Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 9954536 - Disclosure - Short-term Borrowings and Federal Home Loan Bank Advances - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954537 - Disclosure - Long-term Debt - Schedule of long-term debt (Details) link:presentationLink link:calculationLink link:definitionLink 9954538 - Disclosure - Operating Leases - ROU asset and operating lease liability (Details) link:presentationLink link:calculationLink link:definitionLink 9954539 - Disclosure - Operating Leases - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954540 - Disclosure - Operating Leases - Operating lease income and expense and other supplemental information (Details) link:presentationLink link:calculationLink link:definitionLink 9954541 - Disclosure - Operating Leases - Future minimum lease payments (Details) link:presentationLink link:calculationLink link:definitionLink 9954541 - Disclosure - Operating Leases - Future minimum lease payments (Details) link:presentationLink link:calculationLink link:definitionLink 9954542 - Disclosure - Fair Value Measurements - Assets and liabilities measured at fair value on recurring basis (Details) link:presentationLink link:calculationLink link:definitionLink 9954543 - Disclosure - Fair Value Measurements - Reconciliation for measurements at fair value on a recurring basis using significant unobservable inputs (Details) link:presentationLink link:calculationLink link:definitionLink 9954544 - Disclosure - Fair Value Measurements - Quantitative information about Level 3 measurements for fair value on a recurring basis (Details) link:presentationLink link:calculationLink link:definitionLink 9954545 - Disclosure - Fair Value Measurements - Fair value option (Details) link:presentationLink link:calculationLink link:definitionLink 9954546 - Disclosure - Fair Value Measurements - Assets and liabilities measured at fair value on nonrecurring basis (Details) link:presentationLink link:calculationLink link:definitionLink 9954547 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954548 - Disclosure - Fair Value Measurements - Fair values for other financial instruments that are not measured at fair value on recurring basis (Details) link:presentationLink link:calculationLink link:definitionLink 9954549 - Disclosure - Common and Preferred Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9954550 - Disclosure - Equity Compensation Plans - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954551 - Disclosure - Equity Compensation Plans - Restricted stock units and options outstanding activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954552 - Disclosure - Reclassifications Out of AOCI (Details) link:presentationLink link:calculationLink link:definitionLink 9954553 - Disclosure - Earnings Per Share - Computation of basic and diluted earnings per share (Details) link:presentationLink link:calculationLink link:definitionLink 9954554 - Disclosure - Earnings Per Share - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954555 - Disclosure - Income Taxes - Income tax expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954556 - Disclosure - Income Taxes - Differences between provision for income taxes and amount computed as statutory rate (Details) link:presentationLink link:calculationLink link:definitionLink 9954557 - Disclosure - Income Taxes - Deferred taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954558 - Disclosure - Income Taxes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954559 - Disclosure - Income Taxes - Reconciliation of unrecognized tax benefits (Details) link:presentationLink link:calculationLink link:definitionLink 9954560 - Disclosure - Benefit Plans - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954561 - Disclosure - Benefit Plans - Weighted-average assumptions to determine pension benefit obligation (Details) link:presentationLink link:calculationLink link:definitionLink 9954562 - Disclosure - Benefit Plans - Changes in obligations and plan assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954563 - Disclosure - Benefit Plans - Components of net periodic benefit cost (Details) link:presentationLink link:calculationLink link:definitionLink 9954564 - Disclosure - Benefit Plans - Estimated future benefit payments expected to be paid (Details) link:presentationLink link:calculationLink link:definitionLink 9954565 - Disclosure - Regulatory Matters - Regulatory capital ratios and minimum amounts required (Details) link:presentationLink link:calculationLink link:definitionLink 9954566 - Disclosure - Regulatory Matters - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9954567 - Disclosure - Commitments and Contingencies - Contractual amount of off-balance sheet instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9954568 - Disclosure - Commitment and Contingencies - Schedule of tax credit and certain equity method investments (Details) link:presentationLink link:calculationLink link:definitionLink 9954569 - Disclosure - Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) - Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 9954570 - Disclosure - Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) - Statements of Income (Details) link:presentationLink link:calculationLink link:definitionLink 9954571 - Disclosure - Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) - Statements of Cash Flows (Details) link:presentationLink link:calculationLink link:definitionLink 9954572 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink