Investment Securities - Amortized Cost and Estimated Fair Values of Investments Securities (Detail) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Debt Securities Available for Sale
Amortized Cost	$ 2,184,452,000	$ 2,384,325,000
Gross Unrealized Gains	655,000	525,000
Gross Unrealized Losses	(244,324,000)	(232,346,000)
Estimated Fair Value	1,940,783,000	2,152,504,000
Debt Securities Held to Maturity
Totals	122,673,000	133,494,000
Gross Unrealized Gains	4,000	6,000
Gross Unrealized Losses	(8,968,000)	(8,374,000)
Estimated Fair Value	113,709,000	125,126,000
Obligations of U.S. government agencies
Debt Securities Available for Sale
Amortized Cost	1,271,105,000	1,386,772,000
Gross Unrealized Gains	1,000	2,000
Gross Unrealized Losses	(178,082,000)	(165,037,000)
Allowance for Credit Losses	0
Estimated Fair Value	1,093,024,000	1,221,737,000
Debt Securities Held to Maturity
Totals	119,982,000	130,823,000
Gross Unrealized Gains	3,000	0
Gross Unrealized Losses	(8,880,000)	(8,331,000)
Estimated Fair Value	111,105,000	122,492,000
Obligations of states and political subdivisions
Debt Securities Available for Sale
Amortized Cost	251,954,000	262,879,000
Gross Unrealized Gains	85,000	268,000
Gross Unrealized Losses	(29,430,000)	(26,772,000)
Allowance for Credit Losses	0
Estimated Fair Value	222,609,000	236,375,000
Debt Securities Held to Maturity
Totals	2,691,000	2,671,000
Gross Unrealized Gains	1,000	6,000
Gross Unrealized Losses	(88,000)	(43,000)
Estimated Fair Value	2,604,000	2,634,000
Corporate bonds
Debt Securities Available for Sale
Amortized Cost	6,177,000	6,173,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(367,000)	(571,000)
Allowance for Credit Losses	0
Estimated Fair Value	5,810,000	5,602,000
Asset backed securities
Debt Securities Available for Sale
Amortized Cost	344,115,000	359,214,000
Gross Unrealized Gains	569,000	255,000
Gross Unrealized Losses	(1,504,000)	(4,188,000)
Allowance for Credit Losses	0
Estimated Fair Value	343,180,000	355,281,000
Non-agency collateralized mortgage obligations
Debt Securities Available for Sale
Amortized Cost	311,101,000	369,287,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(34,941,000)	(35,778,000)
Estimated Fair Value	$ 276,160,000	$ 333,509,000

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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Amount of allowance for credit loss 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 of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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