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Loans - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2021 USD ($) Loan | Dec. 31, 2020 USD ($) Loan | Dec. 31, 2023 USD ($) | Dec. 27, 2020 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total loans | $ 3,081,230 |  |  | $ 2,861,727 |
Net deferred loan fees | 2,686 |  |  | 2,743 |
Financing Receivable, after Allowance for Credit Loss | $ 3,041,561 |  |  | 2,824,568 |
Minimum [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Lease financing receivables sales-type and direct financing leases for equipment, term | 2 years |  |  |  |
Maximum [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Lease financing receivables sales-type and direct financing leases for equipment, term | 6 years |  |  |  |
Paycheck Protection Program Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total loans | $ 177 |  |  |  |
Number of loans processed | Loan |  | 1,340 | 2,300 |  |
Loans processed |  | $ 131,109 | $ 268,300 |  | $ 284,500,000
Financing Receivable, after Allowance for Credit Loss | 7,520 |  |  | 7,231 |
Commercial and Agriculture [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total loans | 328,488 |  |  | 304,793 |
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Total loans | $ 177 |  |  | $ 326 |

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