Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities Available for Sale
Amortized Cost	$ 2,208,330	$ 1,395,081
Gross Unrealized Gains	16,413	25,225
Gross Unrealized Losses	(16,805)	(6,042)
Estimated Fair Value	2,207,938	1,414,264
Debt Securities Held to Maturity
Amortized Cost	199,759	284,563
Gross Unrealized Gains	8,381	14,163
Gross Unrealized Losses	0	0
Estimated Fair Value	208,140	298,726
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,260,226	795,555
Gross Unrealized Gains	8,193	17,710
Gross Unrealized Losses	(11,030)	(891)
Estimated Fair Value	1,257,389	812,374
Debt Securities Held to Maturity
Amortized Cost	192,068	273,667
Gross Unrealized Gains	8,131	13,774
Gross Unrealized Losses	0	0
Estimated Fair Value	200,199	287,441
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	187,197	123,347
Gross Unrealized Gains	5,832	5,748
Gross Unrealized Losses	(785)	0
Estimated Fair Value	192,244	129,095
Debt Securities Held to Maturity
Amortized Cost	7,691	10,896
Gross Unrealized Gains	250	389
Gross Unrealized Losses	0	0
Estimated Fair Value	7,941	11,285
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,722	2,459
Gross Unrealized Gains	34	85
Gross Unrealized Losses	0	0
Estimated Fair Value	6,756	2,544
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	754,185	473,720
Gross Unrealized Gains	2,354	1,682
Gross Unrealized Losses	(4,990)	(5,151)
Estimated Fair Value	$ 751,549	$ 470,251

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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