Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Debt Securities Available for Sale
Amortized Cost	$ 2,815,167,000	$ 2,208,330,000
Gross Unrealized Gains	772,000	16,413,000
Gross Unrealized Losses	(209,874,000)	(16,805,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	2,606,065,000	2,207,938,000
Debt Securities Held to Maturity
Amortized Cost	176,794,000	199,759,000
Gross Unrealized Gains	53,000	8,381,000
Gross Unrealized Losses	(5,705,000)	0
Allowance for Credit Losses	0	0
Estimated Fair Value	171,142,000	208,140,000
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,671,797,000	1,260,226,000
Gross Unrealized Gains	363,000	8,193,000
Gross Unrealized Losses	(135,329,000)	(11,030,000)
Allowance for Credit Losses	0
Estimated Fair Value	1,536,831,000	1,257,389,000
Debt Securities Held to Maturity
Amortized Cost	170,337,000	192,068,000
Gross Unrealized Gains	12,000	8,131,000
Gross Unrealized Losses	(5,679,000)	0
Estimated Fair Value	164,670,000	200,199,000
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	333,709,000	187,197,000
Gross Unrealized Gains	305,000	5,832,000
Gross Unrealized Losses	(30,320,000)	(785,000)
Allowance for Credit Losses	0
Estimated Fair Value	303,694,000	192,244,000
Debt Securities Held to Maturity
Amortized Cost	6,457,000	7,691,000
Gross Unrealized Gains	41,000	250,000
Gross Unrealized Losses	(26,000)	0
Estimated Fair Value	6,472,000	7,941,000
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	7,659,000	6,722,000
Gross Unrealized Gains	0	34,000
Gross Unrealized Losses	(115,000)	0
Estimated Fair Value	7,544,000	6,756,000
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	448,742,000	408,329,000
Gross Unrealized Gains	104,000	2,354,000
Gross Unrealized Losses	(14,654,000)	(1,131,000)
Allowance for Credit Losses	0
Estimated Fair Value	434,192,000	409,552,000
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	353,260,000	345,856,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(29,456,000)	(3,859,000)
Allowance for Credit Losses	0
Estimated Fair Value	$ 323,804,000	$ 341,997,000

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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