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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities Available for Sale
Less than 12 months, fair value	$ 145,344	$ 117,107
Less than 12 months, unrealized loss	(692)	(1,029)
12 months or more, fair value	1,509,970	1,546,730
12 months or more, unrealized loss	(202,386)	(233,626)
Total, fair value	1,655,314	1,663,837
Total, unrealized loss	(203,078)	(234,655)
Debt Securities Held to Maturity
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	99,695	103,038
12 months or more, unrealized loss	(5,857)	(7,522)
Total, fair value	99,695	103,038
Total, unrealized loss	(5,857)	(7,522)
Obligations of U.S. government agencies
Debt Securities Available for Sale
Less than 12 months, fair value	46,095	63,714
Less than 12 months, unrealized loss	(101)	(842)
12 months or more, fair value	1,008,710	1,021,654
12 months or more, unrealized loss	(147,734)	(173,643)
Total, fair value	1,054,805	1,085,368
Total, unrealized loss	(147,835)	(174,485)
Debt Securities Held to Maturity
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	98,213	101,553
12 months or more, unrealized loss	(5,775)	(7,443)
Total, fair value	98,213	101,553
Total, unrealized loss	(5,775)	(7,443)
Obligations of states and political subdivisions
Debt Securities Available for Sale
Less than 12 months, fair value	10,493	7,457
Less than 12 months, unrealized loss	(415)	(140)
12 months or more, fair value	199,107	208,063
12 months or more, unrealized loss	(27,490)	(28,809)
Total, fair value	209,600	215,520
Total, unrealized loss	(27,905)	(28,949)
Debt Securities Held to Maturity
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	1,482	1,485
12 months or more, unrealized loss	(82)	(79)
Total, fair value	1,482	1,485
Total, unrealized loss	(82)	(79)
Corporate bonds
Debt Securities Available for Sale
Less than 12 months, fair value	0	1,229
Less than 12 months, unrealized loss	0	(17)
12 months or more, fair value	4,710	4,608
12 months or more, unrealized loss	(229)	(328)
Total, fair value	4,710	5,837
Total, unrealized loss	(229)	(345)
Asset backed securities
Debt Securities Available for Sale
Less than 12 months, fair value	88,756	44,707
Less than 12 months, unrealized loss	(176)	(30)
12 months or more, fair value	76,155	75,734
12 months or more, unrealized loss	(1,337)	(1,208)
Total, fair value	164,911	120,441
Total, unrealized loss	(1,513)	(1,238)
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Less than 12 months, fair value	0	0
Less than 12 months, unrealized loss	0	0
12 months or more, fair value	221,288	236,671
12 months or more, unrealized loss	(25,596)	(29,638)
Total, fair value	221,288	236,671
Total, unrealized loss	$ (25,596)	$ (29,638)

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