Commitments and Letters of Credit - Additional Information (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Notional amount of financial standby letters of credit	$ 300,000
Notional amount of performance standby letters of credit	2,700,000
Notional amount of commercial letters of credit	0
Financial instrument of credit risk	100,000	$ 100,000
Unused commitments and letters of credit [Member]
Loss Contingencies [Line Items]
Commitment liability	$ 6,400,000	$ 7,400,000