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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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Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

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