Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	$ 65,044	$ 18,801
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(905)	(67)
12 months or longer, fair value	206,756	240,054
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(38,670)	(35,562)
Total, fair value	271,800	258,855
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(39,575)	(35,629)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Less than twelve months, fair value	2,566	6,005
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	(50)	(94)
Twelve months or longer, fair value	112,441	122,272
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(19,054)	(17,406)
Total, fair value	115,007	128,277
Held-to-maturity securities, unrealized loss position, accumulated loss	(19,104)	(17,500)
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	65,044	16,992
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(905)	(65)
12 months or longer, fair value	205,071	238,053
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(38,537)	(35,362)
Total, fair value	270,115	255,045
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(39,442)	(35,427)
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Less than twelve months, fair value	2,566	6,005
Held-to-maturity securities, continuous unrealized loss position, less than 12 months, accumulated loss	(50)	(94)
Twelve months or longer, fair value	112,441	122,272
Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(19,054)	(17,406)
Total, fair value	115,007	128,277
Held-to-maturity securities, unrealized loss position, accumulated loss	(19,104)	(17,500)
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value		1,029
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss		(1)
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		1,029
Available-for-sale securities, continuous unrealized loss position, accumulated loss		(1)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	0	0
12 months or longer, fair value	1,685	2,001
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(133)	(200)
Total, fair value	1,685	2,001
Available-for-sale securities, continuous unrealized loss position, accumulated loss	$ (133)	(200)
Corporate Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Less than 12 months, fair value		780
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss		(1)
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		780
Available-for-sale securities, continuous unrealized loss position, accumulated loss		$ (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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