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Allowance for Credit Losses - Schedule of Amortized Cost Basis of Collateral Dependent Loans Individually Evaluated Expected Credit Losses and Related Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Real Estate Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated for expected credit losses | $ 4,805 | $ 12,645
Other Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated for expected credit losses | 2,760 | 8,844
Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated allowance for credit losses | 584 | 2,359
Commercial and Agriculture [Member] | Other Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated for expected credit losses | 2,760 | 8,179
Commercial and Agriculture [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated allowance for credit losses | 584 | 1,679
Commercial Real Estate Owner Occupied [Member] | Real Estate Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated for expected credit losses | 2,840 | 0
Commercial Real Estate Owner Occupied [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated allowance for credit losses |  | 0
Commercial Real Estate Non Owner Occupied [Member] | Real Estate Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated for expected credit losses | 484 | 10,514
Commercial Real Estate Non Owner Occupied [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated allowance for credit losses | 0 | 674
Residential Real Estate [Member] | Real Estate Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated for expected credit losses | $ 1,481 | 2,131
Lease Financing Receivable [Member] | Other Loan [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated for expected credit losses |  | 665
Lease Financing Receivable [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans individually evaluated allowance for credit losses |  | $ 6

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