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Loans and Allowance for Loan Losses - Summary of Nonperforming Loan Portfolio (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded Investment, With related allowance | $ 62,174 | $ 62,493
Unpaid principal balance, With related allowance | 62,778 | 62,964
Related Allowance, With related allowance | 25,310 | 15,156
Average Investment Recorded, With related allowance | 65,933 | 61,109
Interest Income (Expense) Recognized, With related allowance | 1,150 | 1,209
Recreation [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded Investment, With related allowance | 7,639 | 8,262
Unpaid principal balance, With related allowance | 7,639 | 8,262
Related Allowance, With related allowance | 264 | 329
Average Investment Recorded, With related allowance | 7,949 | 8,317
Interest Income (Expense) Recognized, With related allowance | 560 | 471
Home Improvement [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded Investment, With related allowance | 171 | 185
Unpaid principal balance, With related allowance | 171 | 185
Related Allowance, With related allowance | 3 | 3
Average Investment Recorded, With related allowance | 172 | 185
Interest Income (Expense) Recognized, With related allowance | 2 |
Commercial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded Investment, With related allowance | 16,596 | 11,862
Unpaid principal balance, With related allowance | 16,600 | 11,867
Average Investment Recorded, With related allowance | 16,884 | 7,886
Interest Income (Expense) Recognized, With related allowance | 123 | 392
Medallion [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Recorded Investment, With related allowance | 37,768 | 42,184
Unpaid principal balance, With related allowance | 38,368 | 42,650
Related Allowance, With related allowance | 25,043 | 14,824
Average Investment Recorded, With related allowance | 40,928 | 44,721
Interest Income (Expense) Recognized, With related allowance | $ 465 | $ 346

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