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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Amortized Cost	$ 3,871,029
Gross Unrealized Gains	14,721
Gross Unrealized Losses	(310,707)
Estimated Fair Value	3,575,043	$ 3,410,899
Amortized Cost, Held to Maturity	1,496,280	1,395,569
Gross Unrealized Gains, Held to Maturity	1,309	2
Gross Unrealized Losses, Held to Maturity	(187,755)	(212,122)
Debt Securities, Held-to-Maturity, Fair Value	1,309,834	1,183,449
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	958,357	960,227
Gross Unrealized Gains	0	106
Gross Unrealized Losses	(166,660)	(145,446)
Estimated Fair Value	791,697	814,887
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	294,686	313,681
Gross Unrealized Gains	668	1,123
Gross Unrealized Losses	(10,621)	(14,434)
Estimated Fair Value	284,733	300,370
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,005,300	798,157
Gross Unrealized Gains	11,448	4,629
Gross Unrealized Losses	(9,900)	(13,901)
Estimated Fair Value	1,006,848	788,885
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,000,882	1,029,846
Gross Unrealized Gains	2,605	30
Gross Unrealized Losses	(30,135)	(40,001)
Estimated Fair Value	973,352	989,875
Amortized Cost, Held to Maturity	640,273	537,856
Gross Unrealized Gains, Held to Maturity	1,309	2
Gross Unrealized Losses, Held to Maturity	(52,213)	(60,162)
Debt Securities, Held-to-Maturity, Fair Value	589,369	477,696
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	611,804	617,605
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(93,391)	(100,723)
Estimated Fair Value	518,413	516,882
Amortized Cost, Held to Maturity	856,007	857,713
Gross Unrealized Gains, Held to Maturity	0	0
Gross Unrealized Losses, Held to Maturity	(135,542)	(151,960)
Debt Securities, Held-to-Maturity, Fair Value	$ 720,465	705,753
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		3,719,516
Gross Unrealized Gains		5,888
Gross Unrealized Losses		(314,505)
Estimated Fair Value		$ 3,410,899

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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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