Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] 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 and other U.S. government agencies US Treasury and Government [Member] Mortgage-backed securities Mortgage Backed Securities, Other [Member] Collateralized mortgage obligations Collateralized Mortgage Backed Securities [Member] State and political subdivisions US States and Political Subdivisions Debt Securities [Member] Other Other Debt Obligations [Member] Equity Securities Equity Securities [Member] Asset-backed securities Asset-backed Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Investment securities available for sale: Available-for-sale Securities, Debt Maturities [Abstract] Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Gross Unrealized Gain Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Securities, Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Investment securities available for sale Available-for-sale Securities Investment securities held to maturity: Held-to-maturity Securities [Abstract] Held-to-maturity Securities, Amortized Cost Basis Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment Held-to-maturity Securities, Gross Unrealized Gain Held-to-maturity Securities, Accumulated Unrecognized Holding Gain Held-to-maturity Securities, Gross Unrealized Losses Held-to-maturity Securities, Accumulated Unrecognized Holding Loss Investment securities held to maturity, estimated fair value Held-to-maturity Securities, Fair Value Transfers and Servicing [Abstract] Loans held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, measurements, nonrecurring Fair Value, Measurements, Nonrecurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Investment securities held to maturity recorded as other than temporary impairment losses Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Held-to-maturity Securities Impaired loans, fair value Impaired Financing Receivable, Recorded Investment Impaired loans, total gains (losses) Impaired Financing Receivable, Fair Value Adjustment Impaired Financing Receivable, Fair Value Adjustment OREO, fair value Other Real Estate, Fair Value Disclosure Other Real Estate, Fair Value Disclosure OREO, total gains (losses) Impairment of Real Estate Accounting Policies [Abstract] Use of estimates Use of Estimates, Policy [Policy Text Block] Recently issued accounting standards New Accounting Pronouncements, Policy [Policy Text Block] Derivatives Derivatives, Policy [Policy Text Block] Securities Financing Activities Repurchase and Resale Agreements Policy [Policy Text Block] Receivables [Abstract] Schedule of composition of loan portfolio Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Disclosure of activity in allowance for loan losses during year Allowance for Credit Losses on Financing Receivables [Table Text Block] Schedule of impaired financing receivables Impaired Financing Receivables [Table Text Block] Schedule of credit quality indicators associated with the Company's loans Financing Receivable Credit Quality Indicators [Table Text Block] Schedule of past due loans Past Due Financing Receivables [Table Text Block] Schedule of troubled debt restructuring loans Troubled Debt Restructurings on Financing Receivables [Table Text Block] Schedule of subsequent default on restructured loans Schedule of Subsequent Default on Restructured Loans [Table Text Block] Schedule of Subsequent Default on Restructured Loans [Table Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial, Financial and Agricultural Commercial, Financial and Agricultural Loan Portfolio [Member] Commercial, Financial and Agricultural Loans Portfolio [Member] Consumer Consumer Portfolio Segment [Member] Residential Residential Portfolio Segment [Member] Commercial Real Estate Commercial Real Estate Portfolio Segment [Member] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass Pass [Member] Special Mention Special Mention [Member] Substandard Substandard [Member] Doubtful Doubtful [Member] Performing Performing Financial Instruments [Member] Nonperforming Nonperforming Financial Instruments [Member] Class of Financing Receivable [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable, Type [Domain] Real estate – construction Construction Loans [Member] Mortgage Mortgage Receivable [Member] Equity lines of credit Home Equity Line of Credit [Member] Equity loans Home Equity Loan [Member] Credit card Credit Card Receivable [Member] Consumer direct Direct Consumer Receivables [Member] Direct Consumer Receivables [Member] Consumer indirect Indirect Consumer Receivables [Member] Indirect Consumer Receivables [Member] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Total loans, excluding covered loans Loans and Leases Receivable, Gross Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Derivatives designated as hedging instrument Designated as Hedging Instrument [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash flow hedges Cash Flow Hedging [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap Interest Rate Swap [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest Income Interest Income [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Cash flow hedges not terminated, net fair value Cash Flow Hedges Derivative Instruments at Fair Value, Net Fair value hedges weighted average expected remaining term Derivative, Average Remaining Maturity Cash flow hedge gain (loss) to be reclassified within twelve months Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months Maximum length of time hedged in interest rate cash flow hedge Maximum Length of Time Hedged in Interest Rate Cash Flow Hedge Interest Rate Cash Flow Hedges [Abstract] Interest Rate Cash Flow Hedges [Abstract] Net change in amount recognized in other comprehensive income Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net Amount reclassified from accumulated other comprehensive income (loss) into net interest income Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Amount of ineffectiveness recognized in net interest income Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, measurements, recurring Fair Value, Measurements, Recurring [Member] Quoted Prices in Active Markets for Identical Assets, Level 1 Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] U.S. Treasury and other U.S. government agencies Other debt securities Interest rate contracts Interest Rate Contract [Member] Commodity contracts Commodity Contract [Member] Foreign exchange contracts Foreign Exchange Contract [Member] Other trading assets Other Trading [Member] Mortgage-backed securities Mortgage Securities [Member] Mortgage Securities [Member] Collateralized mortgage obligations Equity contracts Equity Contract [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Assets: Assets [Abstract] Trading account assets Trading Securities Loans held for sale, estimated fair value Loans Held-for-sale, Fair Value Disclosure Investment securities available for sale Derivative asset Derivative Asset Other assets Other Assets Liabilities: Liabilities [Abstract] Trading account liabilities Trading Liabilities, Fair Value Disclosure Derivative liabilities Derivative Liability Fair Value, Option, Quantitative Disclosures [Table] Fair Value, Option, Quantitative Disclosures [Table] Noninterest income Noninterest Income [Member] Noninterest Income [Member] Eligible Item or Group for Fair Value Option [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Residential mortgage loans held for sale Loans Held for Sale, Mortgages [Member] Loans Held for Sale, Mortgages [Member] Forward contracts Forward Contracts [Member] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Net gains (losses) realized due to changes in fair value of loans Fair Value, Option, Changes in Fair Value, Gain (Loss) Federal home loan bank and federal reserve stock required to be owned by company Federal Home Loan Bank Stock and Federal Reserve Bank Stock Derivative financial assets: Derivative Asset [Abstract] Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized Derivative Asset, Fair Value, Gross Asset Derivative assets, total derivative subject to a master netting arrangement, gross amounts offset in the condensed consolidated balance sheet Derivative Asset, Fair Value, Gross Liability Derivative assets, total derivatives subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheets Derivative Asset, Fair Value, Amount Not Offset Against Collateral Derivative assets, total derivatives subject to a master netting arrangement, financial instruments collateral received/pledged Derivative, Collateral, Obligation to Return Securities Derivate assets, total derivatives subject to a master netting arrangement, cash collateral received/pledged Derivative, Collateral, Obligation to Return Cash Derivative asset, total derivatives subject to a master netting arrangement, net amount Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Derivative assets, total derivatives not subject to a master netting arrangement Derivative Asset, Not Subject to Master Netting Arrangement Derivative assets, total derivatives not subject to a master netting arrangement, net amount Derivative Asset, Not Subject to Master Netting Arrangement Deduction Total derivative financial assets, gross amounts recognized Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement Total derivative financial assets, net amount presented in the condensed consolidated balance sheet Total derivative financial assets, net amount Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative financial liabilities: Derivative Liability [Abstract] Derivative liabilities, total derivative subject to a master netting arrangement, gross amounts recognized Derivative Liability, Fair Value, Gross Liability Derivative liabilities, total derivative subject to a master netting arrangement, gross amount offset in the condensed consolidated balance sheets Derivative Liability, Fair Value, Gross Asset Derivative liabilities, total derivative subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheets Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative liabilities, total derivatives subject to a master netting arrangement, financial instruments collateral received/pledged Derivative, Collateral, Right to Reclaim Securities Derivative liabilities, total derivative subject to a master netting arrangement, cash collateral received/pledged Derivative, Collateral, Right to Reclaim Cash Derivate liabilities, total derivatives subject to master netting arrangement, net amount Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Derivative liabilities, total derivatives not subject to a master netting arrangement Derivative Liability, Not Subject to Master Netting Arrangement Derivative liabilities, total derivatives not subject to a master netting arrangement, net amount Derivative Liability, Not Subject to Master Netting Arrangement Deduction Derivative liabilities, total derivative financial liabilities, gross amount recognized Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement Total derivative financial liabilities, net amount presented in the condensed consolidated balance sheets Total derivative financial liabilities, net amount Derivative Liability, Fair Value, Amount Offset Against Collateral Commitments and Contingencies Disclosure [Abstract] Schedule of commitments to extend credit, standby letters of credit and commercial letters of credit Schedule of Commitments to Extend Credit, Standby Letters of Credit and Commercial Letters of Credit [Table Text Block] Schedule of Commitments to Extend Credit, Standby Letters of Credit and Commercial Letters of Credit [Table Text Block] Fair Value Inputs, Liabilities, Quantitative Information [Table] Fair Value Inputs, Liabilities, Quantitative Information [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Average Weighted Average [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Other Trading Assets Trading Securities [Member] Other Assets Other Assets [Member] Impaired loans Impaired Loans [Member] Impaired Loans [Member] OREO Other Real Estate Owned [Member] Other Real Estate Owned [Member] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Discounted cash flow Income Approach Valuation Technique [Member] Appraised value Market Approach Valuation Technique [Member] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Other trading asset, fair value Other Trading Asset, At Fair Value Other Trading Asset, At Fair Value Interest rate contracts, fair value Interest Rate Derivative Asset, At Fair Value Interest Rate Derivative Asset, At Fair Value Other assets -MSRs, fair value Other Asset, At Fair Value Other Asset, At Fair Value Default rate Fair Value Inputs, Probability of Default Prepayment rate Fair Value Inputs, Prepayment Rate Cost to service Fair Value Inputs, Service Cost, Amount Fair Value Inputs, Service Cost, Amount Closing rate Fair Value Inputs, Closing Rate Fair Value Inputs, Closing Rate Cap grid rate Fair Value Inputs, Cap Rate Discount rate Fair Value Inputs, Discount Rate Appraised value rate Fair Value Inputs, Comparability Adjustments Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Reported value measurement Reported Value Measurement [Member] Estimate of fair value measurement Estimate of Fair Value Measurement [Member] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 2 Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, estimated fair value Cash and Cash Equivalents, Fair Value Disclosure Investment securities held to maturity Held-to-maturity Securities Investment securities held to maturity, estimated fair value Loans, net Loans and Leases Receivable, Net Amount Loans, net, estimated fair value Loans Receivable, Fair Value Disclosure Deposits Deposits Deposits, estimated fair value Deposits, Fair Value Disclosure FHLB and other borrowings Federal Home Loan Bank and Other Borrowings Federal Home Loan Bank and Other Borrowings FHLB and other borrowings, estimated fair value Federal Home Loan Bank and Other Borrowings, Fair Value Disclosure Federal Home Loan Bank and Other Borrowings, Fair Value Disclosure Federal funds purchased and securities sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Federal funds purchased and securities sold under agreements to repurchase, estimated fair value Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Other short-term borrowings Other Short-term Borrowings Other short-term borrowings, estimated fair value Other Short Term Borrowings, Fair Value Disclosure Other Short Term Borrowings, Fair Value Disclosure Supplemental Cash Flow Elements [Abstract] Supplemental Disclosure for Statement of Cash Flows Cash Flow, Supplemental Disclosures [Text Block] Schedule of adjusted cost and approximate fair value of investment securities available for sale and investments held to maturity Marketable Securities [Table Text Block] Schedule of fair value and gross unrealized losses of available for sale and held to maturity securities that were in a loss position Schedule of Unrealized Loss on Investments [Table Text Block] Schedule of activity related to credit losses for debt securities where other than temporary impairments was recognized in other comprehensive income Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] Schedule of investments classified by contractual maturity date Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of realized gain (loss) on investments Realized Gain (Loss) on Investments [Table Text Block] Gross gains Available-for-sale Securities, Gross Realized Gains Gross losses Available-for-sale Securities, Gross Realized Losses Net realized gains Gain (Loss) on Sale of Securities, Net Equity [Abstract] Other Comprehensive Income (Loss), Pretax [Abstract] Other Comprehensive Income (Loss), before Tax [Abstract] Unrealized holding gains arising during period from securities available for sale Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Less: reclassification adjustment for net gains on sale of securities in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Net change in unrealized gains on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Change in unamortized net holding losses on investment securities held to maturity Other Comprehensive Income (Loss), Change in Unamortized Net Holding Losses on Investment, Securities Held to Maturity, Before Tax Other Comprehensive Income (Loss), Change in Unamortized Net Holding Losses on Investment, Securities Held to Maturity, Before Tax Less: non-credit related impairment on investment securities held to maturity Other Comprehensive Income (Loss), Non-credit Related Impairment on Investment Securities Held to Maturity, Before Tax Other Comprehensive Income (Loss), Non-credit Related Impairment on Investment Securities Held to Maturity, Before Tax Change in unamortized non-credit related impairment on investment securities held to maturity Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Held-to-maturity Securities Net change in unamortized holding losses on securities held to maturity Other Comprehensive Income (Loss), Net Change in Unamortized Holding Losses on Securities Held to Maturity, Before Tax Other Comprehensive Income (Loss), Net Change in Unamortized Holding Losses on Securities Held to Maturity, Before Tax Unrealized holding gains arising during period from cash flow hedge instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Change in defined benefit plans Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax Other comprehensive income Other Comprehensive Income (Loss), before Tax Other Comprehensive Income (Loss), Tax Expense/(Benefit) [Abstract] Other Comprehensive Income (Loss), Tax [Abstract] Unrealized holding gains arising during period from securities available for sale Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Less: reclassification adjustment for net gains on sale of securities in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Net change in unrealized gains on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities, Tax Change in unamortized net holding losses on investment securities held to maturity Other Comprehensive Income (Loss), Change in Unamortized Net Holding Losses on Investment, Securities Held to Maturity, Tax Other Comprehensive Income (Loss), Change in Unamortized Net Holding Losses on Investment, Securities Held to Maturity, Tax Less: non-credit related impairment on investment securities held to maturity Other Comprehensive Income (Loss), Non-credit Related Impairment on Investment Securities Held to Maturity, Tax Other Comprehensive Income (Loss), Non-credit Related Impairment on Investment Securities Held to Maturity, Tax Change in unamortized non-credit related impairment on investment securities held to maturity Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Including Portion Attributable to Noncontrolling Interest, Held-to-maturity Securities Net change in unamortized holding losses on securities held to maturity Other Comprehensive Income (Loss), Net Change in Unamortized Holding Losses on Securities Held to Maturity, Tax Other Comprehensive Income (Loss), Net Change in Unamortized Holding Losses on Securities Held to Maturity, Tax Unrealized holding gains arising during period from cash flow hedge instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Change in defined benefit plans Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Other comprehensive income Other Comprehensive Income (Loss), Tax Other Comprehensive Income (Loss), After-Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized holding gains arising during period from securities available for sale Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Less: reclassification adjustment for net gains on sale of securities in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Net change in unrealized holding gains on securities available for sale Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Change in unamortized net holding losses on investment securities held to maturity Other Comprehensive Income (Loss), Change in Unamortized Net Holding Losses on Investment, Securities Held to Maturity, Net of Tax Other Comprehensive Income (Loss), Change in Unamortized Net Holding Losses on Investment, Securities Held to Maturity, Net of Tax Less: non-credit related impairment on investment securities held to maturity Other Comprehensive Income (Loss), Non-credit Related Impairment on Investment Securities Held to Maturity, After Tax Other Comprehensive Income (Loss), Non-credit Related Impairment on Investment Securities Held to Maturity, After Tax Change in unamortized non-credit related impairment on investment securities held to maturity Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Held-to-maturity Securities Net change in unamortized holding losses on securities held to maturity Other Comprehensive Income (Loss), Net Change in Unamortized Holding Losses on Securities Held to Maturity, After Tax Other Comprehensive Income (Loss), Net Change in Unamortized Holding Losses on Securities Held to Maturity, After Tax Unrealized holding gains arising during period from cash flow hedge instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Change in defined benefit plans Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax Servicing Asset at Amortized Cost [Table] Servicing Asset at Amortized Cost [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Residential Mortgage Residential Mortgage [Member] Servicing Asset at Amortized Cost [Line Items] Servicing Asset at Amortized Cost [Line Items] Servicing Asset at Fair Value, Amount [Roll Forward] Servicing Asset at Fair Value, Amount [Roll Forward] Beginning balance Servicing Asset at Fair Value, Amount Additions Servicing Asset at Fair Value, Additions Increase (decrease) in fair value due to changes in valuation inputs or assumptions Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions Increase (decrease) in fair value due to other changes in fair value Servicing Asset at Fair Value, Other Changes in Fair Value Ending balance Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Residential Real Estate Mortgage Loans Sold with Retained Servicing Residential Real Estate Mortgage Loans Sold with Retained Servicing [Member] Residential Real Estate Mortgage Loans Sold with Retained Servicing [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Residential mortgage loans sold Mortgage Loans on Real Estate, Cost of Mortgages Sold Servicing fees recognized Contractually Specified Servicing Fees, Amount Recorded balance of residential real estate mortgage loans sold with retained servicing Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement Fair value of MSRs Schedule of differences between aggregate fair value and aggregate unpaid principle balance Fair Value, Option, Qualitative Disclosures Related to Election [Table Text Block] Summary of asset and liabilities measure at fair value on a recurring basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Reconciliation of assets measured on a recurring basis using significant unobservable inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of carrying amounts and estimated fair values within the fair value hierarchy Fair Value Measurements, Nonrecurring [Table Text Block] Schedule of fair value measurement inputs Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Schedule of fair value by balance sheet location Fair Value, by Balance Sheet Grouping [Table Text Block] Statement of Financial Position [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, liquidation preference (in dollars per share) Preferred Stock, Liquidation Preference Per Share Preferred stock, number of shares authorized Preferred Stock, Shares Authorized Preferred stock, number of shares issued Preferred Stock, Shares Issued Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, number of shares authorized Common Stock, Shares Authorized Common stock, number of shares issued Common Stock, Shares, Issued Securities Financing Activities Assets and Liabilities Subject to Enforceable Master Netting Arrangements [Text Block] Assets and Liabilities Subject to Enforceable Master Netting Arrangements [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Litigation Status [Axis] Litigation Status [Axis] Litigation Status [Domain] Litigation Status [Domain] Pending Litigation Pending Litigation [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Morris Cerullo World Evangelism v. BBVA Compass and Jack Wilkinson Morris Cerullo World Evangelism v. BBVA Compass and Jack Wilkinson [Member] Morris Cerullo World Evangelism v. BBVA Compass and Jack Wilkinson [Member] Intellectual Ventures II, LLC vs BBVA Compass Bancshares, Inc Intellectual Ventures II, LLC vs BBVA Compass Bancshares, Inc [Member] Intellectual Ventures II, LLC vs BBVA Compass Bancshares, Inc [Member] Jack Demetree Vs. BBVA Compass Jack Demetree Vs. BBVA Compass [Member] Jack Demetree Vs. BBVA Compass [Member] In re Plains All American Pipeline, L.P. Securities Litigation In re Plains All American Pipeline, L.P. Securities Litigation [Member] In re Plains All American Pipeline, L.P. Securities Litigation [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities [Member] Accrued Expenses and Other Liabilities [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Potential Recourse Related To FNMA Securitizations Potential Recourse Related To FNMA Securitizations [Member] Potential Recourse Related To FNMA Securitizations [Member] Standard Representations And Warranties Related To Loan Sales To Government-Sponsored Agencies Standard Representations And Warranties Related To Loan Sales To Government-Sponsored Agencies [Member] Standard Representations And Warranties Related To Loan Sales To Government-Sponsored Agencies [Member] FDIC Loss Sharing Agreement FDIC Loss Sharing Agreement [Member] FDIC Loss Sharing Agreement [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] BSI BSI [Member] BSI [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Financial Standby Letter of Credit Financial Standby Letter of Credit [Member] Commercial Loan Commercial Loan [Member] Single Family Residential Loan Single Family Residential Loan [Member] Single Family Residential Loan [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Standby and commercial letters of credit expiration term Guarantor Obligations, Expiration Term Guarantor Obligations, Expiration Term Letters of credit, deferred fees Deferred Revenue Maximum potential amount of future undiscounted payments Company could be required to make on outstanding standby letters of credit Guarantor Obligations, Maximum Exposure, Undiscounted Loss contingency accrual Loss Contingency Accrual Potential recourse Loss Contingency, Range of Possible Loss, Maximum Covered loans Loans And Leases Receivable, Net Reported Amount, And Other Real Estate, Covered Loans And Leases Receivable, Net Reported Amount, And Other Real Estate, Covered Loan losses reimbursable by FDIC, percentage of loss reimbursable FDIC Indemnification Asset, Percentage of Incurred Losses Below Threshold Amount Reimbursed FDIC Indemnification Asset, Percentage of Incurred Losses Below Threshold Amount Reimbursed FDIC indemnification asset, threshold loss amount FDIC Indemnification Asset, Threshold Loss Amount FDIC Indemnification Asset, Threshold Loss Amount FDIC indemnification asset, percentage of incurred losses above threshold, amount reimbursed FDIC Indemnification Asset, Percentage of Incurred Losses Above Threshold Amount Reimbursed FDIC Indemnification Asset, Percentage of Incurred Losses Above Threshold Amount Reimbursed FDIC loss sharing agreement, term FDIC Indemnification Asset, Term Of Loss Sharing Agreement FDIC Indemnification Asset, Term Of Loss Sharing Agreement Loss sharing agreement, percentage owed by company to FDIC if terms are met Loss Sharing Agreement, Percentage Owed By Company to FDIC if Terms Are Met Loss Sharing Agreement, Percentage Owed By Company to FDIC if Terms Are Met Loss sharing agreement, threshold amount Loss Sharing Agreement, Threshold Amount Loss Sharing Agreement, Threshold Amount Loss sharing agreement, percentage of net amount paid to company, subject to repayment to FDIC Loss Sharing Agreement, Percentage of Net Amount Paid to Company, Subject to Repayment to FDIC Loss Sharing Agreement, Percentage of Net Amount Paid to Company, Subject to Repayment to FDIC Loss sharing agreement, administration costs for loans, percentage subject to repayment to FDIC Loss Sharing Agreement, Administration Costs for Loans, Percentage Subject to Repayment to FDIC Loss Sharing Agreement, Administration Costs for Loans, Percentage Subject to Repayment to FDIC Loss sharing agreement, average administration cost percentage Loss Sharing Agreement, Average Administration Cost, Percentage Loss Sharing Agreement, Average Administration Cost, Percentage Loss sharing agreement, amount owed to FDIC Loss Contingency, Estimate of Possible Loss FDIC indemnification expense FDIC Indemnification Expense FDIC Indemnification Expense Line of credit Long-term Line of Credit Damages sought Loss Contingency, Damages Sought, Value Loss contingency, patents allegedly infringed Loss Contingency, Patents Allegedly Infringed, Number Loss contingency, number of security offers challenged Loss Contingency, Number Of Security Offers Challenged Loss Contingency, Number Of Security Offers Challenged Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Unrealized Gains on Securities Available for Sale and Transferred to Held to Maturity Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Accumulated Gains (Losses) on Cash Flow Hedging Instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Defined Benefit Plan Adjustment Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Unamortized Impairment Losses on Investment Securities Held to Maturity Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Investment securities gains, net Available-for-sale Securities, Gross Realized Gain (Loss) Interest on investment securities held to maturity Interest Income, Securities, Operating, Held-to-maturity Interest and fees on loans Interest and Fee Income, Loans and Leases Interest and fees on FHLB advances Interest Expense, Long-term Debt Net periodic expense Defined Benefit Plan, Net Periodic Benefit Cost Net income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax (expense) benefit Income Tax Expense (Benefit) Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Derivatives and Hedging Derivative Instruments and Hedging Activities Disclosure [Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Preferred Stock Preferred Stock [Member] Common Stock Common Stock [Member] Surplus Additional Paid-in Capital [Member] Accumulated Deficit Retained Deficit [Member] Retained Deficit [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Non-controlling Interests Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Net income Other comprehensive income, net of tax Preferred stock dividends Dividends, Preferred Stock Vesting of restricted stock Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition Amortization of stock-based deferred compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Balance, end of period Free-standing derivatives not designated as hedging instrument Not Designated as Hedging Instrument [Member] Futures contracts Future [Member] Option contracts related to mortgage servicing rights Option Contract Related To Mortgage Servicing Rights [Member] Option Contract Related To Mortgage Servicing Rights [Member] Forward contracts related to residential mortgage loans held for sale Interest Rate Forward Contracts, Held For Sale Mortgages [Member] Interest Rate Forward Contracts, Held For Sale Mortgages [Member] Interest rate lock commitments Interest Rate Lock Commitments [Member] Interest rate contracts for customers Commodity contracts for customers Purchased equity option related to equity-linked CDs Purchased Equity Option Contracts, Equity Linked CDs [Member] Purchased Equity Option Contracts, Equity Linked CDs [Member] Written equity option related to equity-linked CDs Written Equity Options Linked to CDs [Member] Written Equity Options Linked to CDs [Member] Forward and swap contracts related to commercial loans Forward Exchange Contracts, Commercial Loans [Member] Forward Exchange Contracts, Commercial Loans [Member] Spot contracts related to commercial loans Foreign Exchange Spot Contracts, Commercial Loans [Member] Foreign Exchange Spot Contracts, Commercial Loans [Member] Foreign currency exchange contracts for customers Mortgage Banking Income and Corporate and Correspondent Investment Sales [Member] Mortgage Banking Income and Corporate and Correspondent Investment Sales [Member] Mortgage Banking Income and Corporate and Correspondent Investment Sales [Member] Mortgage banking income Mortgage Banking Income [Member] Mortgage Banking Income [Member] Other expense Noninterest Expense, Other [Member] Noninterest Expense, Other [Member] Other income Other Income [Member] Corporate and correspondent investments sales Corporate and Correspondant Investment Sales [Member] Corporate and Correspondant Investment Sales [Member] Derivative instruments not designated as hedging instruments, gain (loss), net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Schedule of segment reporting information Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair value hedges Fair Value Hedging [Member] Interest rate swap long term debt Interest Rate Swap Long Term Debt [Member] Interest Rate Swap Long Term Debt [Member] Interest rate swap commercial loan Interest Rate Swap Commercial Loan [Member] Interest Rate Swap Commercial Loan [Member] Interest rate swap FHLB advances Interest Rate Swap FHLB Advances [Member] Interest Rate Swap FHLB Advances [Member] Forward contracts related to residential mortgage loans held for sale Interest Rate Forward Contracts and Option Contracts, Held For Sale Mortgages [Member] Interest Rate Forward Contracts and Option Contracts, Held For Sale Mortgages [Member] Equity contracts, swap associated with sale of Visa Inc. Class B shares Equity Swap Contracts, Sale of Visa Class B Shares [Member] Equity Swap Contracts, Sale of Visa Class B Shares [Member] Futures contracts Futures Contracts [Member] Futures Contracts [Member] Interest rate contracts for customers Interest Rate Contracts For Customers, Trading Account Assets and Liabilities [Member] Interest Rate Contracts For Customers, Trading Account Assets and Liabilities [Member] Commodity contracts for customers Commodity Contracts, Trading Account Assets and Liabilities [Member] Commodity Contracts, Trading Account Assets and Liabilities [Member] Foreign exchange contracts for customers Foreign Exchange Contracts, Trading Account Assets and Liabilities [Member] Foreign Exchange Contracts, Trading Account Assets and Liabilities [Member] Total trading account assets and liabilities Trading Account Assets and Liabilities [Member] Trading Account Assets and Liabilities [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Derivative, notional amount Derivative, Notional Amount Derivative assets Derivative liabilities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate, Non-Segment Corporate, Non-Segment [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Consumer and Commercial Banking Consumer and Commercial Banking [Member] Consumer and Commercial Banking [Member] Corporate and Investment Banking Corporate and Investment Banking [Member] Corporate and Investment Banking [Member] Treasury Treasury [Member] Treasury [Member] Corporate Support and Other Corporate Support and Other [Member] Corporate Support and Other [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Net interest income (expense) Interest Income (Expense), Net Allocated provision for loan losses Provision for Loan and Lease Losses Noninterest income Noninterest Income Noninterest expense Noninterest Expense Net income (loss) before income tax expense (benefit) Income tax expense (benefit) Less: net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to BBVA Compass Bancshares, Inc. Net Income (Loss) Attributable to Parent Average assets Average Assets Average Assets Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Commitments to extend credit Unused Commitments to Extend Credit Standby and commercial letters of credit Guarantor Obligations, Current Carrying Value Aggregate Fair Value Mortgages Held-for-sale, Fair Value Disclosure Aggregate Unpaid Principal Balance Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement Difference Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series A Preferred Stock [Member] Series A Preferred Stock [Member] Other Noninterest Income Other Noninterest Income [Member] Other Noninterest Income [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Revolving Note And Cash Subordinated Agreement Revolving Note And Cash Subordinated Agreement [Member] Revolving Note And Cash Subordinated Agreement [Member] Free-standing derivative instruments – risk management and other purposes Risk Management and Other Purposes Derivative [Member] Risk Management and Other Purposes Derivative [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] BSI Subsidiary of Common Parent [Member] BBVA Affiliated Entity [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit Line of Credit [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] BBVA Compass Bancshares, Inc. BBVA Compass Bancshares, Inc. [Member] BBVA Compass Bancshares, Inc. [Member] BBVA New York [Member] BBVA New York [Member] BBVA New York [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related party transaction, amount of transaction Derivative, Fair Value, Net Securities purchased under agreements to resell Securities Purchased under Agreements to Resell Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase Due from related parties Due from Related Parties FHLB and other borrowings Long-term Debt Interest expense Interest Expense, Related Party Fees on agreements Related Party Transaction, Expenses from Transactions with Related Party Preferred stock Preferred Stock, Value, Issued Preferred stock dividends Revenue from related parties Revenue from Related Parties Related party transaction amount Related Party Transaction, Amounts of Transaction Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance, beginning of year Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Purchases, issuances, sales and settlements: [Abstract] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Balance, end of year Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) Schedule of loans transferred to held for sale and loans sold Schedule of Loans Transferred To Held for Sale And Loans Sold [Table Text Block] Schedule of Loans Transferred To Held for Sale And Loans Sold [Table Text Block] Schedule of loan sales and residential mortgage servicing rights Schedule of Servicing Assets at Fair Value [Table Text Block] Schedule of sensitivity of current fair value of residential real estate mortgage servicing rights Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Individually evaluated impaired loans with no recorded allowance, recorded investment Impaired Financing Receivable, with No Related Allowance, Recorded Investment Individually evaluated impaired loans with no recorded allowance, unpaid principle balance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Individually evaluated impaired loans with a recorded allowance, recorded investment Impaired Financing Receivable, with Related Allowance, Recorded Investment Individually evaluated impaired loans with a recorded allowance, unpaid principle balance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Individually evaluated impaired loans with a recorded allowance, allowance Impaired Financing Receivable, Related Allowance Individually evaluated impaired loans, average recorded investment Impaired Financing Receivable, Average Recorded Investment Individually evaluated impaired loans, interest income recognized Impaired Financing Receivable, Interest Income, Accrual Method Available-for-sale securities, securities in a loss position for less than 12 months, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Available-for-sale securities, securities in a loss position for less than 12 months, unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss Accumulated In Investments Available-for-sale securities, securities in a loss position for 12 months or longer, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Available-for-sale securities, Securities in a loss position for 12 months or longer, unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss, Accumulated in Investments Available-for-sale securities, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale securities, unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss, Accumulated in Investments Held-to-maturity securities, securities in a loss position for less than 12 months, fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Held-to-maturity securities, securities in a loss position for less than 12 months, unrealized losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Held-to-maturity securities, securities in a loss position for 12 months or longer, fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Held-to-maturity securities, securities in a loss position for 12 months or longer, unrealized losses Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Held-to-maturity securities, fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value Held-to-maturity securities unrealized losses Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss Originated For Sale In The Secondary Market Secondary Residential Market [Member] Secondary Residential Market [Member] Residential real estate loans originated for sale in the secondary market sold Net gains recognized on sales of residential real estate loans originated for sale in the secondary market Gain (Loss) on Sale of Mortgage Loans Trading Securities [Table] Trading Securities [Table] Schedule of Trading Securities and Other Trading Assets [Line Items] Schedule of Trading Securities and Other Trading Assets [Line Items] Investment securities available for sale, amortized cost [Abstract] Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Maturing within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Maturing after one but within five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Maturing after five but within ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Maturing after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Total single date maturities Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Mortgage-backed securities and collateralized mortgage obligations Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Available-for-sale Securities, Amortized Cost Basis Investment securities available for sale, fair value [Abstract] Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Maturing within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Maturing after one but within five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Maturing after five but within ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Maturing after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Total single date maturities Available-for-sale Securities, Debt Maturities, Single Maturity Date Mortgage-backed securities and collateralized mortgage obligations Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Held-to-maturity securities, amortized cost [Abstract] Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract] Maturing within one year Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount Maturing after one but within five years Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount Maturing after five but within ten years Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount Maturing after ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount Total single date maturities Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Collateralized mortgage obligations Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount Total Held-to-maturity securities, fair value [Abstract] Held-to-maturity Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Maturing within one year Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value Maturing after one but within five years Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value Maturing after five but within ten years Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value Maturing after ten years Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value Total single date maturities Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value Collateralized mortgage obligations Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value Total Investments Securities Held to Maturity Income Statement [Abstract] Interest income: Interest Income [Abstract] Interest Income [Abstract] Interest and fees on loans Interest on investment securities available for sale Interest and Dividend Income, Securities, Operating, Available-for-sale Interest on federal funds sold, securities purchased under agreements to resell and interest bearing deposits Interest Income, Federal Funds Sold, Securities Purchased Under Agreements To Resell, And Deposits With Financial Institutions Interest Income, Federal Funds Sold, Securities Purchased Under Agreements To Resell, And Deposits With Financial Institutions Interest on trading account assets Interest and Dividend Income, Securities, Operating, Trading or Measured at Fair Value Total interest income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Interest on deposits Interest Expense, Deposits Interest on FHLB and other borrowings Interest on federal funds purchased and securities sold under agreements to repurchase Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase Interest on other short-term borrowings Interest Expense, Short-term Borrowings Total interest expense Interest Expense Net interest income Provision for loan losses Provision For Loan Lease and Other Losses, Covered and Not Covered Provision For Loan Lease and Other Losses, Covered and Not Covered Net interest income after provision for loan losses Interest Income (Expense), after Provision for Loan Loss Noninterest income: Noninterest Income [Abstract] Service charges on deposit accounts Fees and Commissions, Depositor Accounts Card and merchant processing fees Fees and Commissions, Credit Cards Retail investment sales Retail Investment Revenue Retail Investment Revenue Investment banking and advisory fees Investment Advisory, Management and Administrative Fees Asset management fees Asset Management Fees Corporate and correspondent investment sales Fees and Commissions, Corporate and Correspondent Investment Sales Fees and Commissions, Corporate and Correspondent Investment Sales Mortgage banking Fees and Commissions, Mortgage Banking Income Fees and Commissions, Mortgage Banking Income Bank owned life insurance Life Insurance, Corporate or Bank Owned, Change in Value Investment securities gains, net Loss on prepayment of FHLB and other borrowings, net Gain (Loss) on Prepayment of FHLB and Other Borrowings Gain (Loss) on Prepayment of FHLB and Other Borrowings Other Noninterest Income, Other Total noninterest income Noninterest expense: Noninterest Expense [Abstract] Salaries, benefits and commissions Labor and Related Expense Equipment Equipment Expense Professional services Professional Fees Net occupancy Occupancy, Net Amortization of intangibles Amortization of Intangible Assets Securities impairment: Securities Impairment [Abstract] Securities Impairment [Abstract] Other-than-temporary impairment Other than Temporary Impairment Losses, Investments Less: non-credit portion recognized in other comprehensive income Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest Securities impairment Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Other Other Noninterest Expense Total noninterest expense Income tax expense Less: preferred stock dividends Preferred Stock Dividends, Income Statement Impact Net income attributable to common shareholder Net Income (Loss) Available to Common Stockholders, Basic Loans and Loans Held for Sale Excluding Loans Originated for Sale in Secondary Market [Member] Loans and Loans Held for Sale Excluding Loans Originated for Sale in Secondary Market [Member] Loans and Loans Held for Sale Excluding Loans Originated for Sale in Secondary Market [Member] Loans transferred from held for investment to held for sale Transfer of Held for Investment Loans to Held-for-Sale Transfer of Held for Investment Loans to Held-for-Sale Loans and loans held for sale sold Loans and Loans Held for Sale, Cost of Loans Sold Loans and Loans Held for Sale, Cost of Loans Sold Commitments, Contingencies and Guarantees Commitments and Contingencies Disclosure [Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30-59 Days Past Due Financing Receivables, 30 to 59 Days Past Due [Member] 60-89 Days Past Due Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days or More Past Due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Past Due Financing Receivable, Recorded Investment, Past Due Nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Accruing TDRs Financing Receivable, Modifications, Recorded Investment, Accruing Financing Receivable, Modifications, Recorded Investment, Accruing Total Past Due and Impaired Financing Receivable, Recorded Investment, Past Due And Impaired Financing Receivable, Recorded Investment, Past Due And Impaired Not Past Due or Impaired Financing Receivable, Recorded Investment, Not Past Due or Impaired Financing Receivable, Recorded Investment, Not Past Due or Impaired Total Financing Receivable, Past Due, Covered Financing Receivable, Covered, Recorded Investment, Past Due Financing Receivable, Covered, Recorded Investment, Past Due Nonaccrual, Covered Financing Receivable, Covered, Recorded Investment, Nonaccrual Status Financing Receivable, Covered, Recorded Investment, Nonaccrual Status Accruing TDRs, Covered Financing Receivable, Covered, Modifications, Recorded Investment, Accruing Financing Receivable, Covered, Modifications, Recorded Investment, Accruing Total Past Due and Impaired, Covered Financing Receivable, Covered, Recorded Investment, Past Due and Impaired Financing Receivable, Covered, Recorded Investment, Past Due and Impaired Not Past Due or Impaired, Covered Financing Receivable, Covered, Recorded Investment, Not Past Due or Impaired Financing Receivable, Covered, Recorded Investment, Not Past Due or Impaired Total, Covered Financing Receivable, Covered, Recorded Investment Financing Receivable, Covered, Recorded Investment Financing Receivable, Past Due, Total Loans Financing Receivable, Covered And Not Covered, Recorded Investment, Past Due Financing Receivable, Covered And Not Covered, Recorded Investment, Past Due Nonaccrual, Total Loans Financing Receivable, Covered And Not Covered, Recorded Investment, Nonaccrual Status Financing Receivable, Covered And Not Covered, Recorded Investment, Nonaccrual Status Accruing TDRs, Total Loans Financing Receivable, Covered And Not Covered, Modifications, Recorded Investment, Accruing Financing Receivable, Covered And Not Covered, Modifications, Recorded Investment, Accruing Total Past Due and Impaired, Total Loans Financing Receivable, Covered And Not Covered, Recorded Investment, Past Due and Impaired Financing Receivable, Covered And Not Covered, Recorded Investment, Past Due and Impaired Not Past Due or Impaired, Total Loans Financing Receivable, Covered And Not Covered, Recorded Investment, Past Due or Impaired Financing Receivable, Covered And Not Covered, Recorded Investment, Past Due or Impaired Total Loans Financing Receivable, Covered And Not Covered, Recorded Investment, Total Financing Receivable, Covered And Not Covered, Recorded Investment, Total Schedule of Assets Sold under Agreements to Repurchase [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Securities or Other Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Overnight and Continuous Maturity Overnight [Member] Up to 30 days Maturity Less than 30 Days [Member] 30 - 90 days Maturity 30 to 90 Days [Member] Greater Than 90 days Maturity Greater than 90 Days [Member] Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Securities sold under agreements to repurchase, subject to a master netting arrangement, gross amounts recognized Securities Sold under Agreements to Repurchase, Gross Securities sold under agreements repurchase Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Related Party Transactions Related Party Transactions Disclosure [Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] 30-59 Days Past Due Financing Receivable, Modifications, Recorded Investment, 30 to 59 Days Past Due Financing Receivable, Modifications, Recorded Investment, 30 to 59 Days Past Due 60-89 Days Past Due Financing Receivable, Modifications, Recorded Investment, 60 to 89 Days Past Due Financing Receivable, Modifications, Recorded Investment, 60 to 89 Days Past Due 90 Days or More Past Due Financing Receivable, Modifications, Recorded Investment, Equal to Greater than 90 Days Past Due The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings that are 90 days or more past due and accruing Nonaccrual Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status Financing Receivable, Modifications, Recorded Investment, Nonaccrual Status Total Past Due and Nonaccrual Financing Receivable, Modifications, Recorded Investment, Past Due and Nonaccrual Financing Receivable, Modifications, Recorded Investment, Past Due and Nonaccrual Not Past Due or Nonaccrual Financing Receivable, Modifications, Recorded Investment, Not Past Due or Nonaccrual Financing Receivable, Modifications, Recorded Investment, Not Past Due or Nonaccrual Total Financing Receivable, Modifications, Recorded Investment 30 - 59 Days Past Due, Covered Financing Receivable, Covered, Modifications, Recorded Investment, 30 to 59 Days Past Due Financing Receivable, Covered, Modifications, Recorded Investment, 30 to 59 Days Past Due 60 - 89 Days Past Due, Covered Financing Receivable, Covered, Modifications, Recorded Investment, 60 to 89 Days Past Due Financing Receivable, Covered, Modifications, Recorded Investment, 60 to 89 Days Past Due 90 Days or More Past Due, Covered Financing Receivable, Covered, Modifications, Recorded Investment, 90 Days Or More Past Due Financing Receivable, Covered, Modifications, Recorded Investment, 90 Days Or More Past Due Nonaccrual, Covered Financing Receivable, Covered, Modifications, Recorded Investment, Nonaccrual Status Financing Receivable, Covered, Modifications, Recorded Investment, Nonaccrual Status Total Past Due and Nonaccrual, Covered Financing Receivable, Covered, Modifications, Recorded Investment, Past Due and Nonaccrual Financing Receivable, Covered, Modifications, Recorded Investment, Past Due and Nonaccrual Not Past Due or Nonaccrual, Covered Financing Receivable, Covered, Modifications, Recorded Investment, Not Past Due or Nonaccrual Financing Receivable, Covered, Modifications, Recorded Investment, Not Past Due or Nonaccrual Total, Covered Financing Receivable, Covered, Modifications, Recorded Investment Financing Receivable, Covered, Modifications, Recorded Investment 30 - 59 Days Past Due, Total Loans Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, 30 to 59 Days Past Due Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, 30 to 59 Days Past Due 60 - 89 Days Past Due, Total Loans Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, 60 To 89 Days Past Due Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, 60 To 89 Days Past Due 90 Days or More Past Due, Total Loans Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, 90 Days Or More Past Due Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, 90 Days Or More Past Due Nonaccrual, Total Loans Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, Nonaccrual Status Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, Nonaccrual Status Total Past Due and Nonaccrual, Total Loans Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, Past Due and Nonaccrual Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, Past Due and Nonaccrual Not Past Due or Nonaccrual, Total Loans Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, Not Past Due Or Nonaccrual Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment, Not Past Due Or Nonaccrual Total Loans Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment Financing Receivable, Covered and Not Covered, Modifications, Recorded Investment Change in components of other comprehensive income (loss) Comprehensive Income (Loss) [Table Text Block] Schedule of accumulated other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of reclassifications out of accumulated other comprehensive income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Loans and Allowance for Loan Losses Financing Receivables [Text Block] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Axis] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables Acquired with Deteriorated Credit Quality [Domain] Receivables acquired with deteriorated credit quality Receivables Acquired with Deteriorated Credit Quality [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Ending balance of allowance attributable to loans: Ending Balance of Allowance Attributable to Loans [Abstract] Ending Balance of Allowance Attributable to Loans [Abstract] Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Purchased impaired Financing Receivable, Allowance for Credit Losses Purchased nonimpaired Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Allowance For Loan Losses Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Allowance For Loan Losses Purchased nonimpaired, covered Certain Loans Acquired in Transfer Not Accounted For As Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Allowance for Loan Losses, Covered Certain Loans Acquired in Transfer Not Accounted For As Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Allowance for Loan Losses, Covered Purchased nonimpaired, total loans Certain Loans Acquired in Transfer Not Accounted For As Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Allowance for Loan Losses, Covered and Not Covered Certain Loans Acquired in Transfer Not Accounted For As Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Allowance for Loan Losses, Covered and Not Covered Total allowance for loan losses Loans and Leases Receivable, Allowance Total allowance for loan losses, covered Loans and Leases Receivable, Allowance, Covered Total allowance for loan losses, total loans Loans And Leases Receivable Allowance, Covered And Not Covered Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Ending balance of loans: Ending Balance of Loans [Abstract] Ending Balance of Loans [Abstract] Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Purchased impaired Financing Receivable, Net Purchased nonimpaired loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Recorded Investment Certain loans acquired in transfer not account for as debt securities, elected to be accounted for as acquired with deteriorated quality, recorded investment. Purchased nonimpaired loans, covered Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Recorded Investment, Covered Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Recorded Investment, Covered Purchased nonimpaired loans, total loans Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Recorded Investment, Covered and Not Covered Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Elected to be Accounted for as Acquired with Deteriorated Quality, Recorded Investment, Covered and Not Covered Covered loans Loans and Leases Receivable, Gross, Carrying Amount, Covered Total loans Loans And Leases Receivable, Gross, Covered And Not Covered Loans And Leases Receivable, Gross, Covered And Not Covered Statement of Comprehensive Income [Abstract] Net income Other comprehensive income, net of tax: Unrealized holding gains arising during period from securities available for sale Less: reclassification adjustment for net gains on sale of securities available for sale in net income Change in unamortized net holding losses on investment securities held to maturity Less: non-credit related impairment on investment securities held to maturity Change in unamortized non-credit related impairment on investment securities held to maturity Unrealized holding gains arising during period from cash flow hedge instruments Change in defined benefit plans Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to BBVA Compass Bancshares, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of supplemental cash flow disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Statement of Cash Flows [Abstract] Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Depreciation and amortization Depreciation, Amortization and Accretion, Net Accretion of discount, loan fees and purchase market adjustments, net Accretion (Amortization) of Discount, Loan Fees and Purchase Market Adjustments Accretion (Amortization) of Discount, Loan Fees and Purchase Market Adjustments Net change in FDIC indemnification liability FDIC Indemnification Asset, Period Increase (Decrease) Provision for loan losses Amortization of stock based compensation Share-based Compensation Net change in trading account assets Increase (Decrease) in Trading Securities Net change in trading account liabilities Increase (Decrease) in Trading Liabilities Net change in loans held for sale Increase (Decrease) in Loans Held-for-sale Deferred tax expense Deferred Income Tax Expense (Benefit) Investment securities gains, net Loss on prepayment of FHLB and other borrowings, net Loss on sale of premises and equipment Gain (Loss) on Disposition of Property Plant Equipment (Gain) loss on sale of loans Gain (Loss) on Sale of Loans Gain (Loss) on Sale of Loans Net gain on sale of other real estate and other assets Gain (Loss) on Disposition of Other Assets (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Decrease in other liabilities Increase (Decrease) in Other Operating Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sales of investment securities available for sale Proceeds from Sale of Available-for-sale Securities Proceeds from prepayments, maturities and calls of investment securities available for sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Purchases of investment securities available for sale Payments to Acquire Available-for-sale Securities Proceeds from prepayments, maturities and calls of investment securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Purchases of investment securities held to maturity Payments to Acquire Held-to-maturity Securities Proceeds from sales of trading securities Proceeds from Sale of Trading Securities Held-for-investment Purchases of trading securities Payments to Acquire Trading Securities Held-for-investment Net change in loan portfolio Payments for (Proceeds from) Loans and Leases Purchase of premises and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sale of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from sales of loans Proceeds from Sale of Loans Receivable Reimbursements from (payments to) FDIC for covered assets FDIC Indemnification Asset, Cash Payments (Received) Made Amount of increases (decreases) to the indemnification asset due to cash payments (received) made relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). Proceeds from sales of other real estate owned Proceeds from Sale of Other Real Estate Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase in demand deposits, NOW accounts and savings accounts Increase (Decrease) in Demand Deposits, NOW Accounts and Savings Accounts Increase (Decrease) in Demand Deposits, NOW Accounts and Savings Accounts Net increase (decrease) in time deposits Increase (Decrease) in Time Deposits Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase Proceeds from (Payments for) Federal Funds Sold and Securities Purchased under Agreements to Resell, Net Net (decrease) increase in other short-term borrowings Proceeds from (Repayments of) Short-term Debt Proceeds from FHLB and other borrowings Proceeds from Issuance of Long-term Debt Repayment of FHLB and other borrowings Repayments of Long-term Debt Vesting of restricted stock Payments Related to the Vesting of Restricted Stock Payments Related to the Vesting of Restricted Stock Preferred dividends paid Payments of Ordinary Dividends, Preferred Stock and Preference Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Number of Contracts Financing Receivable, Modifications, Number of Contracts Post-Modification Outstanding Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Number of contracts, covered Financing Receivable, Covered, Modifications, Number of Contracts Financing Receivable, Covered, Modifications, Number of Contracts Post modification outstanding recorded investment, covered Financing Receivable, Covered, Modifications, Post-Modification Recorded Investment Financing Receivable, Covered, Modifications, Post-Modification Recorded Investment Number of subsequent default contracts Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded investment at subsequent default Financing Receivable, Modifications, Subsequent Default, Recorded Investment Number of subsequent default contracts, covered Financing Receivable, Covered, Modifications, Subsequent Default, Number of Contracts Financing Receivable, Covered, Modifications, Subsequent Default, Number of Contracts Recorded investment at subsequent default, covered Financing Receivable, Covered, Modifications, Subsequent Default, Recorded Investment Financing Receivable, Covered, Modifications, Subsequent Default, Recorded Investment Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered [Abstract] Commercial loans: Loans and Leases Receivable, Gross, Commercial [Abstract] Commercial, financial and agricultural Loans Receivable, Gross, Commercial, Financial and Agricultural Real estate – construction Loans Receivable, Gross, Commercial, Construction Commercial real estate – mortgage Loans Receivable, Gross, Commercial, Mortgage Total commercial loans Loans and Leases Receivable, Gross, Commercial Consumer loans: Loans and Leases Receivable, Gross, Consumer [Abstract] Residential real estate – mortgage Loans and Leases Receivable, Gross, Consumer, Mortgage Equity lines of credit Loans and Lease Receivable, Gross, Consumer, Equity Lines of Credit Loans and Lease Receivable, Gross, Consumer, Equity Lines of Credit Equity loans Loans and Lease Receivable, Gross, Consumer, Equity Loans Loans and Lease Receivable, Gross, Consumer, Equity Loans Credit card Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card Consumer direct Loans and Lease Receivable, Gross, Consumer, Direct Consumer Loan Loans and Lease Receivable, Gross, Consumer, Direct Consumer Loan Consumer indirect Loans and Lease Receivable, Gross, Consumer, Indirect Consumer Loan Loans and Lease Receivable, Gross, Consumer, Indirect Consumer Loan Total consumer loans Loans and Leases Receivable, Gross, Consumer Total loans Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid Net income taxes paid Income Taxes Paid, Net Supplemental schedule of noncash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Transfer of loans and loans held for sale to OREO Transfer of Loans Held-for-sale to Portfolio Loans Transfer of loans to loans held for sale Transfer of Portfolio Loans and Leases to Held-for-sale Change in unrealized gains on available for sale securities Other Significant Noncash Transaction, Change in Unrealized Gain (Loss) on Available for Sale Securities Other Significant Noncash Transaction, Change in Unrealized Gain (Loss) on Available for Sale Securities Issuance of restricted stock, net of cancellations Other Significant Noncash Transaction, Issuance of Restricted Stock, Net of Cancellations Other Significant Noncash Transaction, Issuance of Restricted Stock, Net of Cancellations Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Unrealized Gains (Losses) on Securities Available for Sale and Transferred to Held to Maturity Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Comprehensive Income [Roll Forward] Beginning balance Accumulated Other Comprehensive Income (Loss), Net of Tax 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 Interest on FHLB and other borrowings Interest On FHLB And Other Borrowings [Member] Interest on FHLB and Other Borrowings [Member] Gain (loss) related to hedge, firm commitments no longer qualifying as a fair value hedge Gain (Loss) on Fair Value Hedges Recognized in Earnings Interest Rate Fair Value Hedges [Abstract] Interest Rate Fair Value Hedges [Abstract] Change in fair value of interest rate contract - interest rate swaps hedging long term debt Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments Change in fair value of interest rate contract - hedged long term debt Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge Interest and amortization related to interest rate swaps on hedged long term debt Interest And Amortization of Hedged Item in Interest Rate Fair Value Hedge Interest And Amortization of Hedged Item in Interest Rate Fair Value Hedge Schedule of assets and liabilities subject to enforceable master netting arrangements Schedule of Securities Financing Transactions [Table Text Block] Schedule of securities sold under agreements to repurchase Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block] Loan Sales and Servicing Transfers and Servicing of Financial Assets [Text Block] Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Schedule of derivative contracts between the Company and BBVA Schedule of Related Party Transactions [Table Text Block] Federal home loan bank and federal reserve stock carried at par value Cash and due from banks Cash and Due from Banks Federal funds sold, securities purchased under agreements to resell and interest bearing deposits Federal Funds Sold, Securities Purchased Under Agreement to Resell and Interest Bearing Deposits Federal Funds Sold, Securities Purchased Under Agreement to Resell and Interest Bearing Deposits Cash and cash equivalents Investment securities held to maturity (fair value of $1,201,832 and $1,244,121 at March 31, 2016 and December 31, 2015, respectively) Loans held for sale, at fair value Loans Allowance for loan losses Net loans Loans and Leases Receivable, Net Reported Amount, Covered and Not Covered Premises and equipment, net Property, Plant and Equipment, Net Bank owned life insurance Bank Owned Life Insurance Goodwill Goodwill Other intangible assets Intangible Assets, Net (Excluding Goodwill) Other real estate owned Real Estate Acquired Through Foreclosure Total assets Assets Deposits: Deposits [Abstract] Noninterest bearing Noninterest-bearing Deposit Liabilities Interest bearing Interest-bearing Deposit Liabilities Total deposits Federal funds purchased and securities sold under agreements to repurchase Accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Total liabilities Liabilities Shareholder’s Equity: Series A Preferred stock, $.0.01 par value, liquidation preference $200,000 per share, authorized - 30,000,000 shares, issued - 1,150 at both March 31, 2016 and December 31, 2015 Common stock - $0.01 par value; authorized - 300,000,000 shares, issued - 222,950,721 shares at both March 31, 2016 and December 31, 2015 Common Stock, Value, Issued Surplus Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Total BBVA Compass Bancshares, Inc. shareholder’s equity Stockholders' Equity Attributable to Parent Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Total shareholder’s equity Total liabilities and shareholder’s equity Liabilities and Equity Derivative, net liability position, aggregate fair value Derivative, Net Liability Position, Aggregate Fair Value Collateral already posted, aggregate fair value Collateral Already Posted, Aggregate Fair Value Additional collateral, aggregate fair value Additional Collateral, Aggregate Fair Value Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Other than temporary impairment recognized in other comprehensive income, beginning of period Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Reductions for securities paid off during the period (realized) Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Cash Flows Additions for the credit component on debt securities in which OTTI was not previously recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, No Previous Impairment Additions for the credit component on debt securities in which OTTI was previously recognized Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses Other than temporary impairment recognized in other comprehensive income, end of period Investment Securities Available for Sale and Investment Securities Held to Maturity Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Financing Receivable, Allowance for Credit Losses [Roll Forward] Financing Receivable, Allowance for Credit Losses [Roll Forward] Allowance for loan losses, beginning of period Allowance for loan losses, covered, beginning of period Allowance for loan losses, total loans, beginning of period Provision (credit) for loan losses Provision for Loan, Lease, and Other Losses Provision (credit) for loan losses, covered Provision For Loan Lease and Other Losses, Covered Provision For Loan Lease and Other Losses, Covered Provision (credit) for loan losses, total loans Loans charged off Financing Receivable, Allowance for Credit Losses, Write-downs Loans charged off, covered Financing Receivable, Allowance for Credit Losses, Write-downs, Covered Financing Receivable, Allowance for Credit Losses, Write-downs, Covered Loans charged off, total loans Financing Receivable, Allowance for Credit Losses, Write-downs, Covered and Not Covered Financing Receivable, Allowance for Credit Losses, Write-downs, Covered and Not Covered Loan recoveries Financing Receivable, Allowance for Credit Losses, Recovery Loan recoveries, covered Financing Receivable, Allowance for Credit Losses, Recovery, Covered Financing Receivable, Allowance for Credit Losses, Recovery, Covered Loan recoveries, total loans Financing Receivable, Allowance for Credit Losses, Recovery, Covered and Not Covered Financing Receivable, Allowance for Credit Losses, Recovery, Covered and Not Covered Net (charge offs) recoveries Financing Receivable, Allowance for Credit Losses, Write-Offs (Recovery), Net Financing Receivable, Allowance for Credit Losses, Write-Offs (Recovery), Net Net (charge offs) recoveries, covered Financing Receivable, Allowance for Credit Losses, Write-Offs (Recovery), Net, Covered Financing Receivable, Allowance for Credit Losses, Write-Offs (Recovery), Net, Covered Net (charge offs) recoveries, total loans Financing Receivable, Allowance for Credit Losses, Write-Offs (Recovery), Net, Covered And Not Covered Financing Receivable, Allowance for Credit Losses, Write-Offs (Recovery), Net, Covered And Not Covered Allowance for loan losses, end of period Allowance for loan losses, covered, end of period Allowance for loan losses, total loans, end of period Schedule of Credit Derivatives [Table] Schedule of Credit Derivatives [Table] Deposits Deposits [Member] Trading Activity [Axis] Trading Activity [Axis] Trading Activity, by Type [Domain] Trading Activity, by Type [Domain] Over the Counter Over the Counter [Member] Derivatives [Line Items] Credit Derivatives [Line Items] Credit risk derivatives, at fair value, net Derivatives, Credit Risk Amount Derivatives, Credit Risk Amount Gain (loss) on derivative instruments held for trading purposes, net Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net Derivative, collateral, right to reclaim cash Derivative, collateral, obligation to return Entity [Abstract] Entity [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Energy Portfolio Segment [Member] Energy Portfolio Segment [Member] Energy Portfolio Segment [Member] Interest Rate Concession [Member] Interest Rate Concession [Member] Interest Rate Concession [Member] Modification of Loan Structure [Member] Modification of Loan Structure [Member] Modification of Loan Structure [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Residential Real Estate [Member] Residential Real Estate [Member] Accounts, Notes, Loans and Financing Receivable Including Other Real Estated Owned [Line Items] Total energy exposure, including unused commitments to extend credit and letters of credit Total Exposure Including Unused Commitments To Extend Credit And Letters Of Credit Total Exposure Including Unused Commitments To Extend Credit And Letters Of Credit TDRs Commitments to lend additional funds to borrowers whose terms have been modified in a TDR Loans and Leases Receivable, Impaired, Commitment to Lend Residential real estate loans secured by residential real estate properties for which formal foreclosure proceedings were in process Mortgage Loans in Process of Foreclosure, Amount Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule Of Assets Subject To Enforceable Master Netting Arrangements Offsetting Assets [Table Text Block] Schedule Of Liabilities Subject To Enforceable Master Netting Arrangements Offsetting Liabilities [Table Text Block] Fair value of collateral received related to securities purchased under agreements to resell Securities Purchased under Agreements to Resell, Fair Value of Collateral Fair value of collateral pledged related to securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase, Fair Value of Collateral Securities purchased under agreements to resell Securities Purchased under Agreements to Resell, Gross Including Not Subject to Master Netting Arrangement [Abstract] Securities purchased under agreements to resell, subject to master netting arrangement, gross amounts recognized Securities Purchased under Agreements to Resell, Gross Securities purchased under agreements to resell, subject to a master netting arrangement, gross amounts offset in the condensed consolidated balance sheets Securities Purchased under Agreements to Resell, Liability Securities purchased under agreements to resell, subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheets Securities purchased under agreements to resell, subject to a master netting arrangement, financial instruments collateral received/ pledged Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities Securities purchased under agreements to resell, net amount Securities Purchased under Agreements to Resell, Amount Offset Against Collateral Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral [Abstract] Securities sold under agreements to repurchase, gross amounts offset in the condensed consolidated balance sheets Securities Sold under Agreements to Repurchase, Asset Securities sold under agreements to repurchase, subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheet Securities sold under agreements to repurchase, subject to a master netting arrangement, financial instruments collateral received/ pledged Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities Securities sold under agreements to repurchase, subject to a master netting arrangement, net amount Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral Schedule of Servicing Assets at Fair Value [Table] Schedule of Servicing Assets at Fair Value [Table] Fixed rate mortgage loan Fixed Rate Residential Mortgage [Member] Adjustable rate mortgage loan Adjustable Rate Residential Mortgage [Member] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] Composition of residential loans serviced for others, percentage Servicing Asset at Fair Value, Composition by Type, Percentage Servicing Asset at Fair Value, Composition by Type, Percentage Weighted average life (in years) Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life Prepayment speed: Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Effect on fair value of a 10% increase Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed Effect on fair value of a 20% increase Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed Weighted average option adjusted spread: Assumptions For Fair Value of Assets Or Liabilities That Relate To Transferor's Continuing Involvement, Option Adjusted Spread Assumptions For Fair Value of Assets Or Liabilities That Relate To Transferor's Continuing Involvement, Option Adjusted Spread Effect on fair value of a 10% increase Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of 10 Percent Adverse Change In Option Adjusted Spread Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of 10 Percent Adverse Change In Option Adjusted Spread Effect on fair value of a 20% increase Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of 20 Percent Adverse Change In Option Adjusted Spread Sensitivity Analysis Of Fair Value, Transferor's Interests In Transferred Financial Assets, Impact Of 20 Percent Adverse Change In Option Adjusted Spread