Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months, fair value	$ 129,937	$ 89,837
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	(8,276)	(984)
Twelve months or longer, fair value	3,872	0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(422)	0
Total, fair value	133,809	89,837
Debt securities, held-to-maturity, unrealized loss position, accumulated loss	(8,698)	(984)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	211,280	167,895
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(14,026)	(1,840)
Twelve months or longer, fair value	48,596	12,097
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(5,198)	(460)
Total, fair value	259,876	179,992
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(19,224)	(2,300)
Residential Mortgage-Backed Securities [Member]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months, fair value	129,937	89,837
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	(8,276)	(984)
Twelve months or longer, fair value	3,872	0
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(422)	0
Total, fair value	133,809	89,837
Debt securities, held-to-maturity, unrealized loss position, accumulated loss	(8,698)	(984)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	205,772	164,326
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(13,887)	(1,816)
Twelve months or longer, fair value	48,596	12,097
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(5,198)	(460)
Total, fair value	254,368	176,423
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(19,085)	(2,276)
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	1,281
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(15)
Twelve months or longer, fair value	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	0
Total, fair value	1,281
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(15)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	2,947	2,790
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(123)	(23)
Twelve 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	2,947	2,790
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(123)	(23)
Corporate Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	1,280	779
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(1)	(1)
Twelve 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	1,280	779
Available-for-sale securities, continuous unrealized loss position, accumulated loss	$ (1)	$ (1)

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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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