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Banks Time Deposits With Other Banks 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] Number of other real estate properties disposed Number of Other Real Estate Properties Disposed Number of Other Real Estate Properties Disposed 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] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Nonowner occupied Nonowner Occupied Commercial Real Estate Loans [Member] Nonowner Occupied Commercial Real Estate Loans [Member] 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] Fiscal year before current fiscal year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Two years before current fiscal year Financing Receivable, Excluding Accrued Interest, Charge Offs, Year Three, Originated, Two Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Charge Offs, Year Three, Originated, Two Years before Current Fiscal Year 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 Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]