Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 130,888	$ 167,895
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(13,908)	(1,840)
12 months or longer, fair value	135,922	12,097
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(28,537)	(460)
Total, fair value	266,810	179,992
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(42,445)	(2,300)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Less than twelve months, fair value	65,044	89,837
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	(5,894)	(984)
Twelve months or longer, fair value	69,024	0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(14,765)	0
Total, fair value	134,068	89,837
Held-to-maturity securities, unrealized loss position, accumulated loss	(20,659)	(984)
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	128,831	164,326
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(13,843)	(1,816)
12 months or longer, fair value	133,902	12,097
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(28,300)	(460)
Total, fair value	262,733	176,423
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(42,143)	(2,276)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Less than twelve months, fair value	65,044	89,837
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	(5,894)	(984)
Twelve months or longer, fair value	69,024	0
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(14,765)	0
Total, fair value	134,068	89,837
Held-to-maturity securities, unrealized loss position, accumulated loss	(20,659)	(984)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	302	2,790
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(22)	(23)
12 months or longer, fair value	2,020	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(237)	0
Total, fair value	2,322	2,790
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(259)	(23)
Corporate Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	500	779
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(1)	(1)
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	500	779
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(1)	$ (1)
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	1,255
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(42)
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	1,255
Available-for-sale securities, continuous unrealized loss position, accumulated loss	$ (42)