Allowance for Credit Losses - Summary by Class of Loans, Carrying Value of Collateral Dependent Nonaccrual Loans and Type of Collateral (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	$ 5,898	$ 7,037
Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	5,892	6,969
Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	6	61
Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	7
Agriculture and Farmland [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Agriculture and Farmland [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Agriculture and Farmland [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Agriculture and Farmland [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Construction [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	191
Construction [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	191
Construction [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Construction [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Commercial and Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	6	61
Commercial and Industrial [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Commercial and Industrial [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	6	61
Commercial and Industrial [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Multifamily [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Multifamily [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Multifamily [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Multifamily [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	2,631	2,548
Owner Occupied [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	2,631	2,548
Owner Occupied [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Owner Occupied [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Non-owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	352	1,229
Non-owner Occupied [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	352	1,229
Non-owner Occupied [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Non-owner Occupied [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
First Liens [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	2,620	2,707
First Liens [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	2,620	2,707
First Liens [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
First Liens [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Second Liens and Lines of Credit [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	289	294
Second Liens and Lines of Credit [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	289	294
Second Liens and Lines of Credit [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Second Liens and Lines of Credit [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Municipal [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Municipal [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Municipal [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Municipal [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Consumer [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	7
Consumer [Member] | Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Consumer [Member] | Business Assets [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	0	0
Consumer [Member] | Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Total Nonaccrual	$ 0	$ 7