Investment Securities - Amount of Securities in Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months, fair value	$ 2,573	$ 2,566
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	(17)	(50)
Twelve months or longer, fair value	109,356	112,441
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(15,272)	(19,054)
Total, fair value	111,929	115,007
Debt securities, held-to-maturity, unrealized loss position, accumulated loss	(15,289)	(19,104)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	26,758	65,044
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(153)	(905)
Twelve months or longer, fair value	259,718	206,756
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(34,729)	(38,670)
Total, fair value	286,476	271,800
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(34,882)	(39,575)
Residential mortgage-backed securities
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months, fair value	2,573	2,566
Debt securities, held-to-maturity, continuous unrealized loss position, less than 12 months, accumulated loss	(17)	(50)
Twelve months or longer, fair value	109,356	112,441
Debt securities, held-to-maturity, continuous unrealized loss position, 12 months or longer, accumulated loss	(15,272)	(19,054)
Total, fair value	111,929	115,007
Debt securities, held-to-maturity, unrealized loss position, accumulated loss	(15,289)	(19,104)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	25,762	65,044
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(151)	(905)
Twelve months or longer, fair value	201,199	205,071
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(30,692)	(38,537)
Total, fair value	226,961	270,115
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(30,843)	(39,442)
Collateralized mortgage obligations
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	0	0
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	0	0
Twelve months or longer, fair value	1,542	1,685
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(99)	(133)
Total, fair value	1,542	1,685
Available-for-sale securities, continuous unrealized loss position, accumulated loss	(99)	$ (133)
Corporate bonds
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract]
Less than twelve months, fair value	996
Available-for-sale securities, continuous unrealized loss position, less than 12 months, accumulated loss	(2)
Twelve months or longer, fair value	56,977
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss	(3,938)
Total, fair value	57,973
Available-for-sale securities, continuous unrealized loss position, accumulated loss	$ (3,940)

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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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