Allowance for Loan 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	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses		$ 624
Loans individually evaluated allowance for credit losses		7
Real Estate Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses	$ 659
Other Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses	1,063
Amortized Cost Basis Of Collateral Dependent Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated allowance for credit losses	523
Commercial and Agriculture [Member] | Real Estate Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses	49
Commercial and Agriculture [Member] | Other Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses	632
Commercial and Agriculture [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated allowance for credit losses	307
Commercial Real Estate Owner Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses		232
Loans individually evaluated allowance for credit losses		6
Residential Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses		392
Loans individually evaluated allowance for credit losses		$ 1
Residential Real Estate [Member] | Real Estate Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses	610
Lease Financing Receivable [Member] | Other Loan [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated for expected credit losses	431
Lease Financing Receivable [Member] | Amortized Cost Basis Of Collateral Dependent Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans individually evaluated allowance for credit losses	$ 216