Commitments and Contingencies - Outstanding Financial Instruments Whose Contract Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Total commitments	$ 224,309	$ 194,503
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Total commitments	195,670	165,992
Credit Card Commitments [Member]
Loss Contingencies [Line Items]
Total commitments	20,651	20,376
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Total commitments	$ 7,988	$ 8,135