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Loans and Allowance for Loan Losses - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) TDR | Dec. 31, 2019 USD ($) TDR | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Weighted average loan-to-value ratio | 327.00% |  | 190.00% |  |  |
Allowance for loan loss | $ 57,548,000 | [1],[2] | $ 46,093,000 | [1],[2] | $ 36,395,000 | $ 46,093,000
Medallion [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Number of loans modified as TDRs defaulted | TDR | 59 |  | 71 |  |  |
Allowance for loan loss | $ 25,043,000 |  | $ 25,410,000 |  |  |
Recreation [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Number of loans modified as TDRs defaulted | TDR | 77 |  | 294 |  |  |
Allowance for loan loss | $ 27,348,000 |  | $ 18,075,000 |  |  |
Commercial Loans [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Number of loans modified as TDRs defaulted | TDR | 1 |  |  |  |  |
Troubled Debt Restructuring Defaulted [Member] | Medallion [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Number of loans modified as TDRs defaulted | TDR | 5 |  | 4 |  |  |
TDR investment value | $ 738,000 |  | $ 1,023,000 |  |  |
Allowance for loan loss | $ 331,000 |  | $ 428,000 |  |  |
Troubled Debt Restructuring Defaulted [Member] | Recreation [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Number of loans modified as TDRs defaulted | TDR | 43 |  | 213 |  |  |
TDR investment value | $ 433,000 |  | $ 1,905,000 |  |  |
Allowance for loan loss | $ 15,000 |  | $ 76,000 |  |  |
Troubled Debt Restructuring Defaulted [Member] | Commercial Loans [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Number of loans modified as TDRs defaulted | TDR | 0 |  |  |  |  |
[1] | As of December 31, 2020, the general reserves previously recorded for the Company’s medallion loan portfolio had been reversed as all loans had been deemed impaired and written down to collateral value.
[2] | As of December 31, 2020, there was no allowance for loan losses and net charge-offs related to the strategic partnership loans.

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