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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities Available for Sale
Less than 12 months, fair value	$ 89,924	$ 117,107
Less than 12 months, unrealized loss	(795)	(1,029)
12 months or more, fair value	1,483,181	1,546,730
12 months or more, unrealized loss	(189,803)	(233,626)
Total, fair value	1,573,105	1,663,837
Total, unrealized loss	(190,598)	(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	95,644	103,038
12 months or more, unrealized loss	(4,703)	(7,522)
Total, fair value	95,644	103,038
Total, unrealized loss	(4,703)	(7,522)
Obligations of U.S. government agencies
Debt Securities Available for Sale
Less than 12 months, fair value	12,636	63,714
Less than 12 months, unrealized loss	(54)	(842)
12 months or more, fair value	992,579	1,021,654
12 months or more, unrealized loss	(135,863)	(173,643)
Total, fair value	1,005,215	1,085,368
Total, unrealized loss	(135,917)	(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	94,137	101,553
12 months or more, unrealized loss	(4,646)	(7,443)
Total, fair value	94,137	101,553
Total, unrealized loss	(4,646)	(7,443)
Obligations of states and political subdivisions
Debt Securities Available for Sale
Less than 12 months, fair value	10,508	7,457
Less than 12 months, unrealized loss	(401)	(140)
12 months or more, fair value	198,470	208,063
12 months or more, unrealized loss	(27,781)	(28,809)
Total, fair value	208,978	215,520
Total, unrealized loss	(28,182)	(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	1,507	1,485
12 months or more, unrealized loss	(57)	(79)
Total, fair value	1,507	1,485
Total, unrealized loss	(57)	(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	4,253	4,608
12 months or more, unrealized loss	(191)	(328)
Total, fair value	4,253	5,837
Total, unrealized loss	(191)	(345)
Asset backed securities
Debt Securities Available for Sale
Less than 12 months, fair value	66,780	44,707
Less than 12 months, unrealized loss	(340)	(30)
12 months or more, fair value	72,002	75,734
12 months or more, unrealized loss	(1,901)	(1,208)
Total, fair value	138,782	120,441
Total, unrealized loss	(2,241)	(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	215,877	236,671
12 months or more, unrealized loss	(24,067)	(29,638)
Total, fair value	215,877	236,671
Total, unrealized loss	$ (24,067)	$ (29,638)

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