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Investment Securities - Gross Unrealized Losses on Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Less than 12 months, fair value	$ 817,761	$ 1,393,099
Less than 12 months, unrealized loss	(133,462)	(14,640)
12 months or more, fair value	1,624,715	153,834
12 months or more, unrealized loss	(184,700)	(2,165)
Total, fair value	2,442,476	1,546,933
Total, unrealized loss	(318,162)	(16,805)
Available-for-sale Securities, Debt Maturities [Abstract]
Less than 12 months, fair value	0
Less than 12 months, unrealized loss	0
12 months or more, fair value	152,161
12 months or more, unrealized loss	(14,577)
Total, fair value	152,161
Total, unrealized loss	(14,577)
Obligations of U.S. government agencies
Debt Securities, Available-for-sale [Abstract]
Less than 12 months, fair value	537,215	947,108
Less than 12 months, unrealized loss	(95,003)	(9,737)
12 months or more, fair value	852,554	44,086
12 months or more, unrealized loss	(119,016)	(1,293)
Total, fair value	1,389,769	991,194
Total, unrealized loss	(214,019)	(11,030)
Available-for-sale Securities, Debt Maturities [Abstract]
Less than 12 months, fair value	0
Less than 12 months, unrealized loss	0
12 months or more, fair value	146,904
12 months or more, unrealized loss	(14,435)
Total, fair value	146,904
Total, unrealized loss	(14,435)
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Less than 12 months, fair value	27,993	56,154
Less than 12 months, unrealized loss	(8,728)	(785)
12 months or more, fair value	253,108	0
12 months or more, unrealized loss	(40,966)	0
Total, fair value	281,101	56,154
Total, unrealized loss	(49,694)	(785)
Available-for-sale Securities, Debt Maturities [Abstract]
Less than 12 months, fair value	0
Less than 12 months, unrealized loss	0
12 months or more, fair value	5,257
12 months or more, unrealized loss	(142)
Total, fair value	5,257
Total, unrealized loss	(142)
Corporate bonds
Debt Securities, Available-for-sale [Abstract]
Less than 12 months, fair value	0
Less than 12 months, unrealized loss	0
12 months or more, fair value	5,858
12 months or more, unrealized loss	(303)
Total, fair value	5,858
Total, unrealized loss	(303)
Asset backed securities
Debt Securities, Available-for-sale [Abstract]
Less than 12 months, fair value	130,298	62,792
Less than 12 months, unrealized loss	(6,102)	(259)
12 months or more, fair value	303,548	109,748
12 months or more, unrealized loss	(7,232)	(872)
Total, fair value	433,846	172,540
Total, unrealized loss	(13,334)	(1,131)
Non-agency collateralized mortgage obligations
Debt Securities, Available-for-sale [Abstract]
Less than 12 months, fair value	122,255	327,045
Less than 12 months, unrealized loss	(23,629)	(3,859)
12 months or more, fair value	209,647	0
12 months or more, unrealized loss	(17,183)	0
Total, fair value	331,902	327,045
Total, unrealized loss	$ (40,812)	$ (3,859)

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