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Loans and Allowance for Loan Losses - Summary of Performance Status of Loan (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 1,229,838 |  | $ 1,160,855
Percentage of Nonperforming to Total |  | 5.06% |  | 5.38%
Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 1,167,664 |  | $ 1,098,362
Non - Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans | [1] | 62,174 |  | 62,493
Recreation [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 792,686 |  | $ 713,332
Percentage of Nonperforming to Total |  | 0.96% |  | 1.16%
Recreation [Member] | Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 785,047 |  | $ 705,070
Recreation [Member] | Non - Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | 7,639 |  | 8,262
Home Improvement [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 334,033 |  | $ 247,324
Percentage of Nonperforming to Total |  | 0.05% |  | 0.07%
Home Improvement [Member] | Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 333,862 |  | $ 247,139
Home Improvement [Member] | Non - Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | 171 |  | 185
Commercial [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 65,327 |  | $ 69,767
Percentage of Nonperforming to Total |  | 25.40% |  | 17.00%
Commercial [Member] | Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 48,731 |  | $ 57,905
Commercial [Member] | Non - Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | 16,596 |  | 11,862
Medallion [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 37,768 |  | $ 130,432
Percentage of Nonperforming to Total |  | 100.00% |  | 32.34%
Medallion [Member] | Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  |  |  | $ 88,248
Medallion [Member] | Non - Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 37,768 | [2] | $ 42,184
Strategic Partnership [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 24 |  |
Percentage of Nonperforming to Total |  | 0.00% |  |
Strategic Partnership [Member] | Performing [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Status of loans |  | $ 24 |  |
[1] | Includes $408 and $36,009 of TDRs as of December 31, 2020 and 2019, which are accruing and paying currently, but which are considered nonperforming loans under GAAP.
[2] | Includes medallion loan premiums of $1,615 as of December 31, 2020.

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