On-Balance Sheet Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative fair value, Asset	$ 895,000	$ 1,414,000
Derivative fair value, Liability	212,000	84,000
Derivative Loan Commitments [Member]
Derivative [Line Items]
Derivative, Notional amount	42,678,000	85,887,000
Undesignated Forward Loan Sale Commitments and TBA Securities [Member]
Derivative [Line Items]
Derivative, Notional amount	44,132,000	80,407,000
Other Assets [Member] | Derivative Loan Commitments [Member]
Derivative [Line Items]
Derivative fair value, Asset	221,000	1,364,000
Other Assets [Member] | Undesignated Forward Loan Sale Commitments and TBA Securities [Member]
Derivative [Line Items]
Derivative fair value, Asset	674,000	50,000
Other Liabilities [Member] | Derivative Loan Commitments [Member]
Derivative [Line Items]
Derivative fair value, Liability	199,000	0
Other Liabilities [Member] | Undesignated Forward Loan Sale Commitments and TBA Securities [Member]
Derivative [Line Items]
Derivative fair value, Liability	$ 13,000	$ 84,000