Investments - Summary of Gross Unrealized Losses and Fair Value of Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Total, Available-for-sale securities, Less Than 12 Months, Fair Value	$ 200,503	$ 24,282
Total, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(1,789)	(787)
Total, Available-for-sale securities, 12 Months or More, Fair Value	556,591	606,838
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(74,344)	(80,735)
Total, Available-for-sale securities, Fair Value	757,094	631,120
Total, Available-for-sale securities, Unrealized Loss	(76,133)	(81,522)
Total, Held-to-maturity securities, Less Than 12 Months, Fair Value	1,020
Total, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(32)
Total, Held-to-maturity securities,Fair Value	1,020
Total, Held-to-maturity securities, Unrealized Loss	(32)
U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Total, Available-for-sale securities, Less Than 12 Months, Fair Value	15,084
Total, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(62)
Total, Available-for-sale securities, 12 Months or More, Fair Value	32,195	33,087
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(6,085)	(6,016)
Total, Available-for-sale securities, Fair Value	47,279	33,087
Total, Available-for-sale securities, Unrealized Loss	(6,147)	(6,016)
U.S. Treasury securities [Member]
Schedule of Investments [Line Items]
Total, Available-for-sale securities, Less Than 12 Months, Fair Value	2,940
Total, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(1)
Total, Available-for-sale securities, 12 Months or More, Fair Value	19,943	19,413
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(77)	(771)
Total, Available-for-sale securities, Fair Value	22,883	19,413
Total, Available-for-sale securities, Unrealized Loss	(78)	(771)
Government-Sponsored Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Total, Available-for-sale securities, Less Than 12 Months, Fair Value	168,783	7,799
Total, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(1,600)	(5)
Total, Available-for-sale securities, 12 Months or More, Fair Value	268,364	306,858
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(34,402)	(35,398)
Total, Available-for-sale securities, Fair Value	437,147	314,657
Total, Available-for-sale securities, Unrealized Loss	(36,002)	(35,403)
Total, Held-to-maturity securities, Less Than 12 Months, Fair Value	853
Total, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(26)
Total, Held-to-maturity securities,Fair Value	853
Total, Held-to-maturity securities, Unrealized Loss	(26)
Private Label Residential Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Total, Available-for-sale securities, 12 Months or More, Fair Value	124,664	137,841
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(20,307)	(23,333)
Total, Available-for-sale securities, Fair Value	124,664	137,841
Total, Available-for-sale securities, Unrealized Loss	(20,307)	(23,333)
Corporate [Member]
Schedule of Investments [Line Items]
Total, Available-for-sale securities, Less Than 12 Months, Fair Value	1,765
Total, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(34)
Total, Available-for-sale securities, 12 Months or More, Fair Value	47,022	49,683
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(3,438)	(7,039)
Total, Available-for-sale securities, Fair Value	48,787	49,683
Total, Available-for-sale securities, Unrealized Loss	(3,472)	(7,039)
Small Business Administration Loan Pools [Member]
Schedule of Investments [Line Items]
Total, Available-for-sale securities, Less Than 12 Months, Fair Value	3,983	5,097
Total, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(3)	(14)
Total, Available-for-sale securities, 12 Months or More, Fair Value	2,284	2,630
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(273)	(325)
Total, Available-for-sale securities, Fair Value	6,267	7,727
Total, Available-for-sale securities, Unrealized Loss	(276)	(339)
State and Political Subdivisions [Member]
Schedule of Investments [Line Items]
Total, Available-for-sale securities, Less Than 12 Months, Fair Value	7,948	11,386
Total, Available-for-sale securities, Less Than 12 Months, Unrealized Loss	(89)	(768)
Total, Available-for-sale securities, 12 Months or More, Fair Value	62,119	57,326
Total, Available-for-sale securities, 12 Months or More, Unrealized Loss	(9,762)	(7,853)
Total, Available-for-sale securities, Fair Value	70,067	68,712
Total, Available-for-sale securities, Unrealized Loss	(9,851)	$ (8,621)
Total, Held-to-maturity securities, Less Than 12 Months, Fair Value	167
Total, Held-to-maturity securities, Less Than 12 Months, Unrealized Loss	(6)
Total, Held-to-maturity securities,Fair Value	167
Total, Held-to-maturity securities, Unrealized Loss	$ (6)