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Loans and Allowance for Loan Losses - Summary of Aging of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | $ 40,541 |  | $ 60,413 |
Current |  | 1,165,235 |  | 1,076,281 |
Total |  | 1,205,776 | [1] | 1,136,694 | [2]
Accruing |  | 0 |  | 0 |
30-59 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 24,890 |  | 40,779 |
60-89 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 8,773 |  | 10,971 |
91+ [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 6,878 |  | 8,663 |
Recreation [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 34,983 |  | 41,583 |
Current |  | 732,391 |  | 648,227 |
Total |  | 767,374 | [1] | 689,810 | [2]
Accruing |  | 0 |  | 0 |
Recreation [Member] | 30-59 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 22,058 |  | 27,357 |
Recreation [Member] | 60-89 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 7,582 |  | 8,426 |
Recreation [Member] | 91+ [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 5,343 |  | 5,800 |
Home Improvement [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 1,201 |  | 1,542 |
Current |  | 335,684 |  | 249,288 |
Total |  | 336,885 | [1] | 250,830 | [2]
Accruing |  | 0 |  | 0 |
Home Improvement [Member] | 30-59 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 813 |  | 931 |
Home Improvement [Member] | 60-89 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 218 |  | 427 |
Home Improvement [Member] | 91+ [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 170 |  | 184 |
Commercial Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 75 |  | 107 |
Current |  | 65,265 |  | 69,660 |
Total |  | 65,340 | [1] | 69,767 | [2]
Accruing |  | 0 |  | 0 |
Commercial Loans [Member] | 91+ [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 75 |  | 107 |
Medallion [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 4,282 |  | 17,181 |
Current |  | 31,871 |  | 109,106 |
Total |  | 36,153 | [1] | 126,287 | [2]
Accruing |  | 0 |  | 0 |
Medallion [Member] | 30-59 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 2,019 |  | 12,491 |
Medallion [Member] | 60-89 [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 973 |  | 2,118 |
Medallion [Member] | 91+ [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Past Due |  | 1,290 |  | $ 2,572 |
Strategic Partnership [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Current |  | 24 |  |  |
Total | [1] | 24 |  |  |
Accruing |  | $ 0 |  |  |
[1] | Excludes loan premiums of $2,717 resulting from purchase price accounting and $21,345 of capitalized loan origination costs.
[2] | Excludes loan premiums of $5,758 resulting from purchase price accounting and $18,403 of capitalized loan origination costs.

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