Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Net gain (loss) on sales of securities	$ (499,000)	$ 15,712,000	$ 1,295,000
Net unrealized gains (losses) recorded in comprehensive income	(123,000)	15,300,000	(586,000)
Unrealized Gains and Losses on Available for Sale Securities | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Loss [Line Items]
Net gain (loss) on sales of securities	$ (499,000)	$ 15,700,000	$ 1,300,000