Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Debt Securities Available for Sale
Amortized Cost	$ 2,661,657,000	$ 2,742,987,000
Gross Unrealized Gains	721,000	421,000
Gross Unrealized Losses	(256,566,000)	(290,970,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	2,405,812,000	2,452,438,000
Debt Securities Held to Maturity
Amortized Cost	152,067,000	160,983,000
Gross Unrealized Gains	15,000	15,000
Gross Unrealized Losses	(9,947,000)	(11,060,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	142,135,000	149,938,000
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,531,759,000	1,568,408,000
Gross Unrealized Gains	5,000	3,000
Gross Unrealized Losses	(174,329,000)	(195,642,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	1,357,435,000	1,372,769,000
Debt Securities Held to Maturity
Amortized Cost	148,700,000	154,830,000
Gross Unrealized Gains	1,000	2,000
Gross Unrealized Losses	(9,942,000)	(11,013,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	138,759,000	143,819,000
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	308,129,000	332,625,000
Gross Unrealized Gains	698,000	401,000
Gross Unrealized Losses	(28,927,000)	(39,821,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	279,900,000	293,205,000
Debt Securities Held to Maturity
Amortized Cost	3,367,000	6,153,000
Gross Unrealized Gains	14,000	13,000
Gross Unrealized Losses	(5,000)	(47,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	3,376,000	6,119,000
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,165,000	6,164,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(427,000)	(413,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	5,738,000	5,751,000
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	440,259,000	454,943,000
Gross Unrealized Gains	18,000	17,000
Gross Unrealized Losses	(12,913,000)	(15,193,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	427,364,000	439,767,000
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	375,345,000	380,847,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(39,970,000)	(39,901,000)
Allowance for Credit Losses	0	0
Estimated Fair Value	$ 335,375,000	$ 340,946,000

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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