Commitments and Contingencies - Outstanding Financial Instruments Whose Contract Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Total commitments	$ 196,815	$ 205,630
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Total commitments	168,781	177,706
Credit Card Commitments [Member]
Loss Contingencies [Line Items]
Total commitments	19,838	19,763
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Total commitments	$ 8,196	$ 8,161