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Adjustment, after Tax Maturity, year three Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Due in Year Three Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Due in Year Three Mortgage loans held for sale, at fair value Mortgage loans held for sale (at fair value) Loan, Mortgage, Held-for-Sale, Fair Value Disclosure Assets (liabilities) measured at fair value Fair Value, Net Asset (Liability) Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Less than 3 months Weighted Average Interest Rate of Time Deposits, $100,000 or More, Three Months or Less Stock issued for employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Accounts receivables Valuation Methods, Accounts Receivable [Member] Valuation Methods, Accounts Receivable Interest bearing demand, savings and money market deposits Interest Bearing Demand, Savings And Money Market Deposits Interest Bearing Demand, 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Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Securities Securities Investments Within 1 year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Domain] Subsequent Event Type [Domain] 3 to 6 months Contractual Maturities, Time Deposits, $100,000 or More, Three Months Through Six Months Retained Earnings Retained Earnings [Member] Operating lease liabilities Operating Lease, Liability, Noncurrent Net unrealized holding losses on debt securities available for sale Net unrealized holding (losses) gains on debt securities available for sale: AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Schedule of Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation 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provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] FDIC assessments and insurance Federal Deposit Insurance Corporation Premium Expense Total Shareholder Return Amount Total Shareholder Return Amount Cards and trade finance servicing fees Fees and Commissions, Mortgage Banking and Servicing Liabilities Liabilities, Fair Value Disclosure [Abstract] Three years before current fiscal year Financing Receivable, Excluding Accrued Interest, Charge Offs, Year Four, Originated, Three Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Charge Offs, Year Four, Originated, Three Years before Current Fiscal Year Nonaccrual Loans With Related Allowance Financing Receivable, Excluding Accrued Interest, Nonaccrual, With Allowance Financing Receivable, Excluding Accrued Interest, Nonaccrual, With Allowance Ownership [Domain] Ownership [Domain] Three years before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Obligation to repay Cash pledged as collateral, obligation to repay Cash Pledged As Collateral Obligation To Repay Cash Pledged As Collateral Obligation To Repay Adjustments to reconcile net income to net cash provided by operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Reclassification adjustment for net gains included in net income Reclassification from AOCI, Current Period, Tax Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Financial Instruments [Domain] Financial Instruments [Domain] Tax Effect Other Comprehensive Income (Loss), Tax [Abstract] Deposits and service fees Deposits and Service Fees Deposits and Service Fees Financial assets: Financial Instruments, Financial Assets, Balance 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compensation expense Share-Based Payment Arrangement, Noncash Expense Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Interest expense Interest Expense, Operating and Nonoperating [Abstract] Salaries and employee benefits Labor and Related Expense Net (increase) decrease in loans Payments for (Proceeds from) Loans and Leases Over 3 years Weighted Average Interest Rate of Time Deposits, $100,000 or More, After 36 Months Weighted Average Interest Rate of Time Deposits, $100,000 or More, After 36 Months After 5 years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Schedule of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Cash and Cash Equivalents and Time Deposits with other Banks Cash And Cash Equivalents And Time Deposits With Other Banks [Text Block] Cash And Cash Equivalents And Time Deposits With Other Banks Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Measurement Input Type Measurement Input Type [Axis] Loss Unlikely to be Collected Financing Receivable [Member] With Specific Reserve With Specific Reserve [Member] With Specific Reserve Repurchase of common stock - Class A Repurchase of common stock - Class A Payments for Repurchase of Common Stock Mortgage Backed Securities Collateralized Mortgage-Backed Securities [Member] Mortgage servicing rights (MSRs) Mortgage Servicing Rights Mortgage Servicing Rights Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Consumer loans and 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Geographic Distribution [Domain] Geographic Distribution [Domain] Schedule of Loan Portfolio by Classes Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Additional paid in capital Additional Paid in Capital Junior subordinated debentures held by trust subsidiaries Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust U.S. Government agency and sponsored enterprise residential MBS U.S. Government Agency and Sponsored Enterprise Residential Mortgage Backed Securities [Member] U.S. Government Agency and Sponsored Enterprise Residential Mortgage Backed Securities Redemption of senior notes Redemption of senior notes Repayments of Senior Debt Name Awards Close in Time to MNPI Disclosures, Individual Name Proceeds from loan portfolio sales Proceeds from Sale of Loans Held-for-investment1 Proceeds from Sale of Loans Held-for-investment1 Purchases of investment securities Payments to Acquire Investments Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] 3 to 6 months Weighted Average Interest Rate of Time Deposits, $100,000 or More, Three Months Through Six Months Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Schedule of Realized Gain (Loss) Schedule of Realized Gain (Loss) [Table Text Block] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Debt securities, available-for-sale, weighted average yield Debt Securities, Available-for-Sale, Weighted Average Yield Adjustment to Compensation: Adjustment to Compensation [Axis] Maturity, year two Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Due in Year Two Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Due in Year Two Hedging Designation [Domain] Hedging Designation 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Hedging Instrument [Member] Unrealized gain (loss) Equity Securities, FV-NI, Unrealized Gain (Loss) Cash flow dependent loans measured for expected credit losses Cash Flow Dependent Loans Measured for Expected Credit Losses [Member] Cash Flow Dependent Loans Measured for Expected Credit Losses Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Deposits Deposits [Abstract] Net premium amortization on securities Investment Income, Net, Amortization of Discount and Premium Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Interest rate caps: Interest Rate Cap [Member] Approximate Contract Amount Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability Other Liabilities Derivative instruments Derivative Liability Non-PEO NEO Non-PEO NEO [Member] Credit risk participation agreements Credit Risk Contract [Member] Number of sale of loans held for sale Number Of Loans Sold At Lower Of Cost Or Fair Value Number Of Loans Sold At Lower Of Cost Or Fair Value Senior notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for new lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Advances from Federal Home Loan Banks [Abstract] Advance from Federal Home Loan Bank [Abstract] Income tax expense Income Tax Expense (Benefit) Total noninterest expenses Noninterest Expense Collateralized Loan Obligations Collateralized Loan Obligations [Member] Restricted stock forfeited (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Award Timing Method Award Timing Method [Text Block] Net (decrease) increase in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Loans charged-off Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Loan-level derivative income Loan Level Derivative Income Loan Level Derivative Income Schedule of Amortized Cost Basis of Collateral Dependent/ Impaired Loans Schedule Of Financing Receivables By Type Of Collateral [Table Text Block] Schedule Of Financing Receivables By Type Of Collateral Cash paid: Cash Paid [Abstract] Cash Paid Non-agency commercial MBS Non-agency Commercial Mortgage Backed Securities [Member] Non-agency commercial Net income attributable to Amerant Bancorp Inc. Net income attributable to Amerant Bancorp Inc. Net income Net income attributable to Amerant Bancorp Inc. Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Components of AOCL/AOCI Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] 1 to 3 years Contractual Maturities, Time Deposits, $100,000 or More, 12 Months through 36 Months Contractual Maturities, Time Deposits, $100,000 or More, 12 Months through 36 Months Number of instruments terminated Derivative, Number of Instruments Terminated Derivative, Number of Instruments Terminated Fiscal year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Residential and Commercial Residential And Commercial Portfolio Segment [Member] Residential And Commercial Portfolio Segment Individually Evaluated Individually Evaluated [Member] Individually Evaluated Geographic Distribution [Axis] Geographic Distribution [Axis] Total Mortgage loans held for sale at fair value Loan, Held-for-Sale, Fair Value Disclosure Mortgage loans on real estate, commercial and consumer, net Mortgage Loans on Real Estate, Commercial and Consumer, Net Internal risk ratings, loan balance, minimum Internal Risk Ratings, Loan Balance, Minimum Internal Risk Ratings, Loan Balance, Minimum Maturity, year four Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Due in Year Four Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate, Due in Year Four Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]