Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Trust Services [Member] Trust Services [Member] Trust Services [Member] Synovus Bank [Member] Synovus Bank [Member] Synovus Bank [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill Goodwill Accumulated impairment losses Goodwill, Impairment Loss Goodwill acquired during year Goodwill, Acquired During Period Goodwill Other Assets [Abstract] Cash surrender value of bank-owned life insurance Cash Surrender Value of Life Insurance Federal Reserve Bank and FHLB stock Federal Reserve Bank Stock And Federal Home Loan Bank Stock Federal Reserve Bank Stock And Federal Home Loan Bank Stock Accrued interest receivable Interest Receivable Prepaid expenses Prepaid Expense Accounts receivable Accounts Receivable, Net Private equity investments Private Equity Investments Private Equity Investments Derivative asset positions Derivative Asset Other properties held for sale Disposal Group, Including Discontinued Operation, Other Assets SBA/GGL servicing assets, net Servicing Asset Miscellaneous other assets Other Assets, Miscellaneous Total other assets Other Assets Discontinued Operations and Disposal Groups [Abstract] Sale of Branches Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Quarterly Financial Data [Abstract] Interest income Interest and Dividend Income, Operating Net interest income Interest Income (Expense), Net Provision for loan losses Provision for Loan and Lease Losses Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income available common shareholders Net Income (Loss) Available to Common Stockholders, Basic Net income per common share, basic (per share) Earnings Per Share, Basic Net income per common share, diluted (per share) Earnings Per Share, Diluted Allowance for loan losses and provision for loan losses Allowance for Loan Losses and Provision for Loan Losses Allowance for Loan Losses and Provision for Loan Losses Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Shareholder Approved Equity Compensation Plans for Shares of Synovus Stock [Member] Shareholder Approved Equity Compensation Plans for Shares of Synovus Stock [Member] Shareholder Approved Equity Compensation Plans for Shares of Synovus Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of securities to be issued upon vesting of restricted share units (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of securities to be issued upon exercise of outstanding options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted-average exercise price of outstanding options (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Number of shares remaining available for issuance excluding shares discussed (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Supplemental Income Statement Elements [Abstract] Litigation settlement/contingency expenses Litigation Settlement/ Loss Contingency Expenses Litigation Settlement/ Loss Contingency Expenses Insurance and bonds Insurance and Bonds Insurance and Bonds Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Cash and cash equivalents Cash and Due from Banks Interest bearing funds with Federal Reserve Bank Interest bearing funds with Federal Reserve Bank Interest bearing funds deposited with the Federal Reserve Bank. Interest earning deposits with banks Interest-bearing Deposits in Banks and Other Financial Institutions Federal funds sold and securities purchased under resale agreements Federal Funds Sold and Securities Purchased under Agreements to Resell Trading account assets, at fair value Trading Securities Mortgage loans held for sale, at fair value Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Mortgage Investment securities available for sale, at fair value Available-for-sale Securities Loans, net of deferred fees and costs Loans and Leases Receivable, Net of Deferred Income Allowance for loan losses Loans and Leases Receivable, Allowance Loans, net Loans and Leases Receivable, Net Amount Premises and equipment, net Property, Plant and Equipment, Net Goodwill Other intangible assets Other Intangible Assets, Net Other real estate Real Estate Acquired Through Foreclosure Deferred tax asset, net Deferred Tax Assets, Net Other assets Total assets Assets LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Non-interest bearing deposits Noninterest-bearing Deposit Liabilities Interest bearing deposits, excluding brokered deposits Interest Bearing Deposit Liabilities, Excluding Brokered Deposits Interest Bearing Deposit Liabilities, Excluding Brokered Deposits Brokered deposits Interest-bearing Domestic Deposit, Brokered Total deposits Deposits Federal funds purchased and securities sold under repurchase agreements Federal Funds Purchased And Other Short Term Borrowings Federal funds purchased, repurchase agreements, and other short-term borrowings Long-term debt Long-term Debt Other liabilities Other Liabilities Total liabilities Liabilities Shareholders' Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Series C Preferred Stock – no par value. 5,200,000 shares outstanding at December 31, 2016 and December 31, 2015 Preferred Stock, Value, Issued Common stock - $1.00 par value. Authorized 342,857,143 shares at December 31, 2016 and December 31, 2015; issued 142,025,720 at December 31, 2016 and 140,592,409 at December 31, 2015; outstanding 122,266,106 at December 31, 2016 and 129,547,032 at December 31, 2015 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock, at cost – 19,759,614 shares at December 31, 2016 and 11,045,377 shares at December 31, 2015 Treasury Stock, Value Accumulated other comprehensive loss, net Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity Schedule of Stock Options Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Fair Value of Option Grants Used in Measuring Compensation Expense Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Restricted Stock Units Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Schedule of Grants Under All Synovus Equity Compensation Plans Schedule of Aggregate Information of Grants Under All Entity Equity Compensation Plans [Table Text Block] Schedule of Aggregate Information of Grants Under All Entity Equity Compensation Plans [Table Text Block] Variable Interest Entities [Abstract] Variable Interest Entities [Abstract] Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Rabbi Trusts [Member] Rabbi Trusts [Member] Rabbi Trusts [Member] Low Income Housing Tax Credit Partnerships [Member] Low Income Housing Tax Credit Partnerships [Member] Low Income Housing Tax Credit Partnerships [Member] Historic Rehabilitation Partnerships [Member] Historic Rehabilitation Partnerships [Member] Historic Rehabilitation Partnerships [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Carrying value of VIE assets and liabilities, net Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net Equity method investments Equity Method Investments Commitments to fund equity investments Variable Interest Entity, Financial or Other Support, Amount Stockholders' Equity Note [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Shares Issued [Member] Preferred Stock [Member] Common Shares Issued [Member] Common Stock [Member] Treasury Shares Held [Member] Treasury Stock [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series C Preferred Stock [Member] Series C Preferred Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Shares, Outstanding Common stock, shares outstanding Common Stock, Shares, Outstanding Issuance of common stock for acquisition Stock Issued During Period, Value, Acquisitions Restricted share unit activity Stock Issued During Period, Shares, Restricted Share Unit, Net of Forfeitures Stock Issued During Period, Shares, Restricted Share Unit, Net of Forfeitures Stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Repurchase of common stock Treasury Stock, Shares, Acquired Repurchase of common stock Stock Repurchased During Period, Shares Balance Investments [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities, Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] U.S. Treasury Securities [Member] US Treasury Securities [Member] U.S. Government Agency Securities [Member] US Government Agencies Short-term Debt Securities [Member] Securities Issued By U.S. Government Sponsored Enterprises [Member] US Government-sponsored Enterprises Debt Securities [Member] Mortgage-Backed Securities Issued By U.S. Government Agencies [Member] Mortgage Backed Securities Issued By U S Government Agencies [Member] Mortgage Backed Securities Issued By U S Government Agencies [Member] Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member] Mortgages [Member] Collateralized Mortgage Obligations Issued by U.S. Government Sponsored Enterprises [Member] Collateralized Mortgage Obligations Issued By U S Government Sponsored Enterprises [Member] Collateralized Mortgage Obligations Issued by U.S. Government Sponsored Enterprises [Member] State and Municipal Securities [Member] US States and Political Subdivisions Debt Securities [Member] Equity Securities [Member] Equity Securities [Member] Other Investments [Member] Other Investments [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Financial Statements [Table] Condensed Financial Statements [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Parent Company [Member] Parent Company [Member] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Net income, Before-tax Amount Income (loss) before income taxes including income from discontinued operations before income taxes Income (loss) before income taxes including income from discontinued operations before income taxes Net income, Tax (Expense) Benefit Reclassification adjustment for losses realized in net income, Before-tax Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Reclassification adjustment for losses realized in net income, Tax (Expense) Benefit Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax Reclassification adjustment for losses realized in net income, Net of Tax Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Reclassification adjustment for net gains realized in net income on investment securities available for sale, Before-tax Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reclassification adjustment for net gains realized in net income on investment securities available for sale, Tax (Expense) Benefit Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Reclassification adjustment for net gains realized in net income on investment securities available for sale, Net of Tax Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Net unrealized (losses) gains arising during the period, Before-tax Amount Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Net unrealized (losses) gains arising during the period, Tax (Expense) Benefit Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Net unrealized (losses) gains arising during the period, Net of Tax Amount Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other comprehensive gain (loss) of bank subsidiary, Before-tax Amount Other Comprehensive Income (Loss) of Subsidiaries, before Tax Other Comprehensive Income (Loss) of Subsidiaries, before Tax Other comprehensive gain (loss) of bank subsidiary, Tax (expense) Benefit Other Comprehensive Income (Loss) of Subsidiaries, Tax Other Comprehensive Income (Loss) of Subsidiaries, Tax Other comprehensive gain (loss) of bank subsidiary, Net of Tax Amount Other Comprehensive Income (Loss) of Subsidiaries, Net of Tax Other Comprehensive Income (Loss) of Subsidiaries, Net of Tax Other comprehensive (loss) income, Before-tax Amount Other Comprehensive Income (Loss), before Tax Other comprehensive (loss) income, Tax (Expense) Benefit Other Comprehensive Income (Loss), Tax Other comprehensive (loss) income, Net of Tax Amount Other Comprehensive Income (Loss), Net of Tax Comprehensive income, Net of Tax Amount Comprehensive Income (Loss), Net of Tax, Attributable to Parent Proceeds from sales of investment securities available for sale Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds Gross realized gains on sales (1) Available-for-sale Securities, Gross Realized Gains Gross realized losses on sales Available-for-sale Securities, Gross Realized Losses Investment securities gains, net Available-for-sale Securities, Gross Realized Gain (Loss) Available-for-sale securities, transfers, gains Available-for-sale Securities, Transfers to Trading, Gains (Losses) Investment securities available for sale transferred to trading account assets at fair value Investment securities available for sale transferred to trading account assets at fair value Investment securities available for sale transferred to trading account assets at fair value Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Net Unrealized Gains (Losses) on Cash Flow Hedges [Member] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member] Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Post-retirement Unfunded Health Benefit [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward] Beginning balance Other comprehensive income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Ending balance Collateralized Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member] Collateralized Mortgage Backed Securities Issued By U S Government Sponsored Enterprises [Member] Collateralized Mortgage-Backed Securities Issued by U.S. Government Sponsored Enterprises [Member] Amortized Cost, Within One year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Amortized Cost, 1 to 5 Years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Amortized Cost, 5 to 10 Years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Amortized Cost, More Than 10 years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Amortized Cost, Amortized Cost, No Stated Maturity Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Total Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Fair Value, Within One year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Fair Value, 1 to 5 Years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Fair Value, 5 to 10 Years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Fair Value, More Than 10 years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Fair Value, No Stated Maturity Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Total Fair Value Available-for-sale Securities, Debt Securities Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Share Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding, Beginning of Period (in shares) Share unit rounding due to reverse stock split on May 16, 2014 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Rounded due to Reserve Stock Split in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Rounded due to Reserve Stock Split in Period, Gross Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Dividend equivalents granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Dividend Equivalents Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Dividend Equivalents Granted Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding, End of Period (in shares) Weighted-Average grant date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share unit rounding due to reverse stock split on May 16, 2014, Weighted-Average Grant-date Fair Value (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Rounded due to Reserve Split in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Equity Instruments Other than Options, Rounded due to Reserve Split in Period, Weighted Average Exercise Price Granted, Weighted-Average Grant-date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Dividend Equivalents Granted, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Dividend Equivalents Granted, Weighted Average Grant Date Fair Value Vested, Weighted-Average Grant-date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) Schedule of Income Statement, Supplemental Disclosure Schedule of Income Statement, Supplemental Disclosure [Table Text Block] Schedule of Income Statement, Supplemental Disclosure [Table Text Block] Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 5.125% Subordinated Notes due June 15, 2017 [Member] Five Point One Two Five Percent Subordinated Notes, Due June 15, 2017 [Member] 5.125% Subordinated Notes, Due June 15, 2017 [Member] 7.875% Senior Notes due February 15, 2019 [Member] Seven Point Eight Seven Five Percent Senior Notes, Due February 15, 2019 [Member] 7.875% Senior Notes, Due February 15, 2019 [Member] 5.75% Subordinated Notes, Due December 15, 2025 [Member] Five Point Seven Five Percent Subordinated Notes, Due December 15, 2025 [Member] Five Point Seven Five Percent Subordinated Notes, Due December 15, 2025 [Member] LIBOR Plus 1.80% debentures, due April 19, 2035 with quarterly interest payments and principal to be paid at maturity (rate of 2.04% and 2.11% at December 31, 2013 and 2012, respectively) LIBOR Plus 180 Debentures, due April 19, 2035 [Member] LIBOR Plus 180 Debentures, due April 19, 2035 [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Senior Notes [Member] Senior Notes [Member] FHLB Advances [Member] Federal Home Loan Bank Advances [Member] Other Notes Payable and Capital Leases [Member] Other Notes Payable and Capital Leases [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Triggering Event [Axis] Triggering Event [Axis] Triggering Event [Axis] Triggering Event [Domain] Triggering Event [Domain] [Domain] for Triggering Event [Axis] To be paid at Maturity [Member] To be paid at Maturity [Member] To be paid at Maturity [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Subordinated notes Subordinated Debt Long-term debt Long-term Debt, Gross Unsecured debt Unsecured Debt Hedge-related basis adjustments Hedge-related Basis Adjustments Hedge-related Basis Adjustments FHLB advances with interest and principal payments due at various maturity dates through 2018 Long-term Federal Home Loan Bank Advances Other notes payable and capital leases with interest and principal payments due at various maturity dates through 2031 Other Notes Payable and Capital Lease Obligations Other Notes Payable and Capital Lease Obligations Stated percentage Debt Instrument, Interest Rate, Stated Percentage Debt, face amount Debt Instrument, Face Amount Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Interest rate at period end Debt Instrument, Interest Rate, Effective Percentage Weighted average interest rate Long-term Debt, Weighted Average Interest Rate Extinguishment of debt, amount Extinguishment of Debt, Amount Restructuring Charges [Abstract] Severance charges Severance Costs Lease termination charges Gain (Loss) on Contract Termination Asset impairment charges Asset Impairment Charges Gain on sale of assets held for sale, net Gain (Loss) on Disposition of Other Assets Professional fees and other charges Restructuring Charges Professional Fees And Other Charges Restructuring charges, professional fees. Total restructuring charges Restructuring Charges Accounting Policies [Abstract] Basis Of Presentation [Table] Basis Of Presentation [Table] Basis Of Presentation [Table] Schedule of Investment Income, Reported Amounts, by Category [Axis] Investment Type [Axis] Investment Income, Categories [Domain] Investments [Domain] Cash And Cash Equivalents [Member] Cash and Cash Equivalents [Member] Loans Rating [Axis] Loans Rating [Axis] Loans Rating [Axis] Loans Rating [Domain] Loans Rating [Domain] [Domain] for Loans Rating [Axis] DRR Methodology [Member] DRR Methodology [Member] DRR Methodology [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Non-employee Director [Member] Non-employee Director [Member] Non-employee Director [Member] Non-employee [Member] Non-employee [Member] Non-employee [Member] Basis Of Presentation [Line Items] Basis Of Presentation [Line Items] Basis Of Presentation [Line Items] Total deposits Cash And Due From Banks Restricted Cash and due from banks which is pledged as collateral or restricted as to withdrawal. Cash and cash equivalents Cash On Deposit Per Federal Reserve Bank Requirements Cash on deposit to meet Federal Reserve Bank Requirements. Interest earning deposits with banks Short Term Investments Restricted LOC Short-term investments which are pledged in connection with letters of credit. Federal funds sold Short Term Investments Restricted Derivatives Short-term investments which are pledged in connection with derivative instruments. Retail loans and commercial loans, evaluated for impairment Retail Loans and Commercial Loans, Evaluated for Impairment Retail Loans and Commercial Loans, Evaluated for Impairment Loans, net of deferred fees and costs Loans, net, percent Loans and Leases Receivable, Net Amount, Percent Loans and Leases Receivable, Net Amount, Percent Useful life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Federal Reserve Bank stock held Federal Reserve Bank Stock Federal Home Loan Bank stock held Federal Home Loan Bank Stock Stock split, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Non-interest income revenue streams in scope Non-interest Income Revenue Streams in Scope Non-interest Income Revenue Streams in Scope Statement of Comprehensive Income [Abstract] Net change related to cash flow hedges: Before-tax Amount Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax [Abstract] Net change related to cash flow hedges: Tax (Expense) Benefit Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract] Net change related to cash flow hedges: Net of Tax Amount Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] Net unrealized gains (losses) on investment securities available for sale: Before-tax Amount Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, [Abstract] Reclassification adjustment for net gains realized in net income, Before-tax Amount Net unrealized gains (losses), Before-tax Amount Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Net unrealized gains (losses) on investment securities available for sale: Tax (Expense) Benefit Other Comprehensive Income (Loss), Available-for-sale Securities, Tax [Abstract] Reclassification adjustment for net gains realized in net income, Tax (Expense) Benefit Net unrealized gains (losses), Tax (Expense) Benefit Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Net unrealized gains (losses) on investment securities available for sale: Net of Tax Amount Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] Reclassification adjustment for net gains realized in net income, Net of Tax Amount Net unrealized gains (losses), Net of Tax Amount Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Post-retirement unfunded health benefit: Before-tax Amount Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax [Abstract] Reclassification adjustment for gains realized in net income, Before-tax Amount Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax Actuarial gains arising during the period, Before-tax Amount Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax Net unrealized (losses) gains, Before-tax Amount Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax Post-retirement unfunded health benefit: Tax (Expense) Benefit Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax [Abstract] Reclassification adjustment for gains realized in net income, Tax (Expense) Benefit Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax Actuarial gains arising during the period, Tax (Expense) Benefit Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax Net unrealized (losses) gains, Tax (Expense) Benefit Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Post-retirement unfunded health benefit: Net of Tax Amount Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract] Reclassification adjustment for gains realized in net income, Net of Tax Amount Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax Actuarial gains arising during the period, Net of Tax Amount Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax Net unrealized (losses) gains, Net of Tax Amount Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Loans and Allowance for Loan Losses [Abstract] Loans and Allowance for Loan Losses [Abstract] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable, Recorded Investment, by Class of Financing Receivable [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable, Type [Domain] Commercial Real Estate [Member] Commercial Real Estate [Member] Investment Properties [Member] Investment Properties [Member] Investment Properties [Member] 1-4 Family Properties [Member] One To Four Family Properties [Member] One To Four Family Properties [Member] Land Acquisition [Member] Land Acquisition [Member] Land Acquisition [Member] Commercial And Industrial [Member] Commercial And Industrial [Member] Commercial and Industrial [Member] Commercial, Financial and Agricultural [Member] Commercial, Financial and Agricultural [Member] Commercial, Financial and Agricultural [Member] Owner-Occupied [Member] Owner-Occupied [Member] Owner-Occupied [Member] Retail [Member] Retail [Member] Retail [Member] Servicing Assets at Fair Value by Types of Financial instrument [Axis] Financial Instrument [Axis] Types of Financial Instruments [Domain] Financial Instruments [Domain] Home Equity Lines [Member] Home Equity Line of Credit [Member] Consumer Mortgages [Member] Consumer Loan [Member] Credit Cards [Member] Credit Card Receivable [Member] Other Retail Loans [Member] Other Retail Loans [Member] Other Retail Loans [Member] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Recorded Investment, With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment Unpaid Principal Balance, With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Related Allowance, With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Related Allowance Impaired Financing Receivable, with No Related Allowance, Related Allowance Average Recorded Investment, With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Interest Income Recognized, With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Recorded Investment, With allowance recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Unpaid Principal Balance, With allowance recorded Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Related Allowance, With allowance recorded Impaired Financing Receivable, with Related Allowance, Related Allowance Impaired Financing Receivable, with Related Allowance, Related Allowance Average Recorded Investment, With allowance recorded Impaired Financing Receivable, with Related Allowance, Average 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Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Contingent consideration Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability Deferred tax liability, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities, Other Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Consideration paid Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Cash paid Payments to Acquire Businesses, Gross Fair value of common stock issued Loans, unpaid principal balance Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Loans Payable, Unpaid Principal Balance Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Loans Payable, Unpaid Principal Balance Schedule of Premises and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Financial Instruments Owned and Pledged as Collateral by Type [Axis] Financial Instruments Owned and Pledged as Collateral by Type [Axis] Financial Instruments Owned and Pledged as Collateral, Type [Domain] Financial Instruments Owned and Pledged as Collateral, Type [Domain] Loans Receivable [Member] Loans Receivable [Member] Repurchased face amount Debt Instrument, Repurchased Face Amount Proceeds from issuance of debt Proceeds from Issuance of Debt Loss on repurchase of debt Gain (Loss) on Repurchase of Debt Instrument Recorded balance loans receivable Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 2013 Omnibus Plan [Member] Two Thousand Thirteen Omnibus Plan [Member] Two Thousand Thirteen Omnibus Plan [Member] Market Restricted Stock Units (MRSUs) [Member] Market Restricted Stock Units (MRSUs) [Member] Market Restricted Stock Units (MRSUs) [Member] Performance Share Units (PSUs) [Member] Performance Share Units (PSUs) [Member] Performance Share Units (PSUs) [Member] Salary Stock Units (SSUs) [Member] Salary Stock Units (SSUs) [Member] Salary Stock Units (SSUs) [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Contractual Expiration Dates in 2017 and 2018 [Member] Contractual Expiration Dates in 2017 and 2018 [Member] Contractual Expiration Dates in 2017 and 2018 [Member] Shares of authorized but unissued common stock reserved for future grants (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Contractual terms Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Non-option awards granted (in shares) Non-option awards granted, weighted-average grant-date fair value (in dollars per share) Share-based compensation expense Allocated Share-based Compensation Expense Tax benefit recognized from compensation expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Options outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options outstanding, weighted average remaining contractual term (years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options exercised, intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Cash received from option exercises Total grant date fair value of stock options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Options expired/canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Options expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Share-based compensation, excess tax expense, amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Expense, Amount Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Expense, Amount Number of simulations Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Number of Simulations Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Number of Simulations Non-option awards vested, total fair value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Taxes paid for vesting of employee share units Share-based Compensation Arrangement by Share-based Payment Award, Taxes Paid for Vesting of Employee Share Units Share-based Compensation Arrangement by Share-based Payment Award, Taxes Paid for Vesting of Employee Share Units Unrecognized compensation cost, period of recognition (years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Vesting range based on return on average assets (ROAA) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Range Based on Shareholder Return Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Range Based on Shareholder Return Options, vested and expected to vest, range based on return on average assets Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Range Based on Return on Average Assets (ROAA) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Range Based on Return on Average Assets (ROAA) Units granted, fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted in Period, Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted in Period, Fair Value Reconciliation of Unrecognized Income Tax Benefits Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at January 1, Unrecognized Tax Benefits Additions based on income tax positions related to current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Additions for income tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Additions from acquisition Unrecognized Tax Benefits, Increase Resulting from Acquisition Deductions for income tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Statute of limitation expirations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Balance at December 31, Mortgage loans held for sale Change In Mortgage Loans Held For Sale Included In Net Income Changes in the fair value of mortgage loans held for sale that were included in the consolidated statements of income during the reporting period. Fair value Additional Collateral, Aggregate Fair Value Unpaid principal balance Fair value option, aggregate unpaid principal balance of mortgage loans held for sale Fair value option, aggregate unpaid principal balance of mortgage loans held for sale. Fair value less aggregate unpaid principal balance Fair Value, Option, Aggregate Differences, Long-term Debt Instruments Total Income Tax Expense (Benefit) Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total current income tax expense Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total deferred income tax expense Total income tax expense Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) Condensed Financial Information of Parent Company Only Disclosure [Text Block] Income Statement [Abstract] Interest income: Revenues [Abstract] Loans, including fees Interest and Fee Income, Loans and Leases Investment securities available for sale Interest Income on Available for Sale Securities Interest Income on Available for Sale Securities Trading account assets Interest and Dividend Income, Securities, Operating, Trading or Measured at Fair Value Mortgage loans held for sale Interest and Fee Income, Loans Held-for-sale, Mortgages Federal Reserve Bank balances Interest on Federal Reserve Bank balances Interest income earned on balances deposited with the Federal Reserve Bank. Other earning assets