Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 167,895,000	$ 18,222,000
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(1,840,000)	(77,000)
12 months or longer, fair value	12,097,000	31,000
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(460,000)	(1,000)
Total, fair value	179,992,000	18,253,000
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(2,300,000)	(78,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Less than twelve months, fair value	89,837,000	0
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	(984,000)	0
Twelve months or longer, fair value	0	0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0	0
Total, fair value	89,837,000	0
Held-to-maturity securities, unrealized loss position, accumulated loss	(984,000)	0
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	164,326,000	13,677,000
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(1,816,000)	(62,000)
12 months or longer, fair value	12,097,000	31,000
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(460,000)	(1,000)
Total, fair value	176,423,000	13,708,000
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(2,276,000)	(63,000)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Less than twelve months, fair value	89,837,000
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	(984,000)
Twelve months or longer, fair value	0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0
Total, fair value	89,837,000
Held-to-maturity securities, unrealized loss position, accumulated loss	(984,000)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	2,790,000	4,545,000
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(23,000)	(15,000)
12 months or longer, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0	0
Total, fair value	2,790,000	4,545,000
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(23,000)	$ (15,000)
Corporate Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	779,000
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(1,000)
12 months or longer, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0
Total, fair value	779,000
Available-for-sale securities, continuous unrealized loss position, accumulated loss	$ (1,000)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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