Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities Available for Sale
Amortized Cost	$ 2,742,987	$ 2,208,330
Gross Unrealized Gains	421	16,413
Gross Unrealized Losses	(290,970)	(16,805)
Estimated Fair Value	2,452,438	2,207,938
Debt Securities Held to Maturity
Amortized Cost	160,983	199,759
Gross Unrealized Gains	15	8,381
Gross Unrealized Losses	(11,060)	0
Estimated Fair Value	149,938	208,140
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,568,408	1,260,226
Gross Unrealized Gains	3	8,193
Gross Unrealized Losses	(195,642)	(11,030)
Estimated Fair Value	1,372,769	1,257,389
Debt Securities Held to Maturity
Amortized Cost	154,830	192,068
Gross Unrealized Gains	2	8,131
Gross Unrealized Losses	(11,013)	0
Estimated Fair Value	143,819	200,199
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	332,625	187,197
Gross Unrealized Gains	401	5,832
Gross Unrealized Losses	(39,821)	(785)
Estimated Fair Value	293,205	192,244
Debt Securities Held to Maturity
Amortized Cost	6,153	7,691
Gross Unrealized Gains	13	250
Gross Unrealized Losses	(47)	0
Estimated Fair Value	6,119	7,941
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,164	6,722
Gross Unrealized Gains	0	34
Gross Unrealized Losses	(413)	0
Estimated Fair Value	5,751	6,756
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	454,943	408,329
Gross Unrealized Gains	17	2,354
Gross Unrealized Losses	(15,193)	(1,131)
Estimated Fair Value	439,767	409,552
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	380,847	345,856
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(39,901)	(3,859)
Estimated Fair Value	$ 340,946	$ 341,997

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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