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Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities Available for Sale
Amortized Cost	$ 2,798,316	$ 2,208,330
Gross Unrealized Gains	111	16,413
Gross Unrealized Losses	(318,162)	(16,805)
Estimated Fair Value	2,480,265	2,207,938
Debt Securities Held to Maturity
Amortized Cost	168,038	199,759
Gross Unrealized Gains	3	8,381
Gross Unrealized Losses	(14,577)	0
Estimated Fair Value	153,464	208,140
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,603,933	1,260,226
Gross Unrealized Gains	1	8,193
Gross Unrealized Losses	(214,019)	(11,030)
Estimated Fair Value	1,389,915	1,257,389
Debt Securities Held to Maturity
Amortized Cost	161,581	192,068
Gross Unrealized Gains	3	8,131
Gross Unrealized Losses	(14,435)	0
Estimated Fair Value	147,149	200,199
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	332,809	187,197
Gross Unrealized Gains	8	5,832
Gross Unrealized Losses	(49,694)	(785)
Estimated Fair Value	283,123	192,244
Debt Securities Held to Maturity
Amortized Cost	6,457	7,691
Gross Unrealized Gains	0	250
Gross Unrealized Losses	(142)	0
Estimated Fair Value	6,315	7,941
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,161	6,722
Gross Unrealized Gains	0	34
Gross Unrealized Losses	(303)	0
Estimated Fair Value	5,858	6,756
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	467,033	408,329
Gross Unrealized Gains	102	2,354
Gross Unrealized Losses	(13,334)	(1,131)
Estimated Fair Value	453,801	409,552
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	388,380	345,856
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(40,812)	(3,859)
Estimated Fair Value	$ 347,568	$ 341,997

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