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Loans and Allowance for Loan Losses - Summary of Allowance for Loan Losses by Type (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Allowance for loan losses - ending balance | $ 57,548 | [1],[2] | $ 46,093 | [1],[2] | $ 36,395 | $ 46,093
Percentage of Allowance | 100.00% |  | 100.00% |  |  |
Allowance as a Percent of Loan Category | 4.68% |  | 3.97% |  |  |
Allowance as a Percent of Nonaccrual | 93.17% |  | 174.04% |  |  |
Recreation [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Allowance for loan losses - ending balance | $ 27,348 |  | $ 18,075 |  |  |
Percentage of Allowance | 48.00% |  | 39.00% |  |  |
Allowance as a Percent of Loan Category | 3.45% |  | 2.53% |  |  |
Allowance as a Percent of Nonaccrual | 378.20% |  | 228.25% |  |  |
Home Improvement [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Allowance for loan losses - ending balance | $ 5,157 |  | $ 2,608 |  |  |
Percentage of Allowance | 9.00% |  | 6.00% |  |  |
Allowance as a Percent of Loan Category | 1.54% |  | 1.05% |  |  |
Medallion [Member] |  |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |  |
Allowance for loan losses - ending balance | $ 25,043 |  | $ 25,410 |  |  |
Percentage of Allowance | 43.00% |  | 55.00% |  |  |
Allowance as a Percent of Loan Category | 66.31% |  | 19.48% |  |  |
Allowance as a Percent of Nonaccrual | 68.01% |  | 389.84% |  |  |
[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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