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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities Available for Sale
Less than 12 months, fair value	$ 107,517	$ 66,657
Less than 12 months, unrealized loss	(165)	(751)
12 months or more, fair value	1,667,772	1,997,383
12 months or more, unrealized loss	(181,372)	(231,595)
Total, fair value	1,775,289	2,064,040
Total, unrealized loss	(181,537)	(232,346)
Debt Securities Held to Maturity
Less than 12 months, fair value	506	0
Less than 12 months, unrealized loss	(3)	0
12 months or more, fair value	110,173	123,271
12 months or more, unrealized loss	(5,279)	(8,374)
Total, fair value	110,679	123,271
Total, unrealized loss	(5,282)	(8,374)
Obligations of U.S. government agencies
Debt Securities Available for Sale
Less than 12 months, fair value	7	224
Less than 12 months, unrealized loss	(1)	0
12 months or more, fair value	1,092,624	1,221,320
12 months or more, unrealized loss	(132,116)	(165,037)
Total, fair value	1,092,631	1,221,544
Total, unrealized loss	(132,117)	(165,037)
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	109,144	122,259
12 months or more, unrealized loss	(5,253)	(8,331)
Total, fair value	109,144	122,259
Total, unrealized loss	(5,253)	(8,331)
Obligations of states and political subdivisions
Debt Securities Available for Sale
Less than 12 months, fair value	0	6,229
Less than 12 months, unrealized loss	0	(75)
12 months or more, fair value	216,428	216,497
12 months or more, unrealized loss	(20,526)	(26,697)
Total, fair value	216,428	222,726
Total, unrealized loss	(20,526)	(26,772)
Debt Securities Held to Maturity
Less than 12 months, fair value	506	0
Less than 12 months, unrealized loss	(3)	0
12 months or more, fair value	1,029	1,012
12 months or more, unrealized loss	(26)	(43)
Total, fair value	1,535	1,012
Total, unrealized loss	(29)	(43)
Corporate bonds
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	4,598	5,602
12 months or more, unrealized loss	(335)	(571)
Total, fair value	4,598	5,602
Total, unrealized loss	(335)	(571)
Asset backed securities
Debt Securities Available for Sale
Less than 12 months, fair value	107,510	15,928
Less than 12 months, unrealized loss	(164)	(93)
12 months or more, fair value	109,099	264,731
12 months or more, unrealized loss	(1,349)	(4,095)
Total, fair value	216,609	280,659
Total, unrealized loss	(1,513)	(4,188)
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Less than 12 months, fair value	0	44,276
Less than 12 months, unrealized loss	0	(583)
12 months or more, fair value	245,023	289,233
12 months or more, unrealized loss	(27,046)	(35,195)
Total, fair value	245,023	333,509
Total, unrealized loss	$ (27,046)	$ (35,778)

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