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Investment Securities Schedule of Amortized Cost and Fair Values of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Amortized Cost	$ 2,898,568
Gross Unrealized Gains	325
Gross Unrealized Losses	(480,025)
Estimated Fair Value	2,418,868	$ 2,646,767
Amortized Cost, Held to Maturity	1,279,733	1,321,256
Gross Unrealized Gains, Held to Maturity	0	0
Gross Unrealized Losses, Held to Maturity	(259,889)	(196,207)
Debt Securities, Held-to-Maturity, Fair Value	1,019,844	1,125,049
US Government Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	225,244	226,140
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,798)	(7,655)
Estimated Fair Value	222,446	218,485
US Government Agencies Debt Securities
Schedule of Investments [Line Items]
Amortized Cost	1,041	1,050
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(54)	(42)
Estimated Fair Value	987	1,008
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	1,203,732	1,284,245
Gross Unrealized Gains	0	283
Gross Unrealized Losses	(254,586)	(178,816)
Estimated Fair Value	949,146	1,105,712
Corporate Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	479,941	459,792
Gross Unrealized Gains	320	0
Gross Unrealized Losses	(51,777)	(37,483)
Estimated Fair Value	428,484	422,309
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Amortized Cost	127,845	147,155
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(15,628)	(13,122)
Estimated Fair Value	112,217	134,033
Mortgage-Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	228,431	242,527
Gross Unrealized Gains	5	18
Gross Unrealized Losses	(39,161)	(29,847)
Estimated Fair Value	189,275	212,698
Amortized Cost, Held to Maturity	418,362	457,325
Gross Unrealized Gains, Held to Maturity	0	0
Gross Unrealized Losses, Held to Maturity	(73,552)	(57,480)
Debt Securities, Held-to-Maturity, Fair Value	344,810	399,845
Commercial Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost	632,334	631,604
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(116,021)	(79,082)
Estimated Fair Value	516,313	552,522
Amortized Cost, Held to Maturity	861,371	863,931
Gross Unrealized Gains, Held to Maturity	0	0
Gross Unrealized Losses, Held to Maturity	(186,337)	(138,727)
Debt Securities, Held-to-Maturity, Fair Value	$ 675,034	725,204
Debt Securities [Member]
Schedule of Investments [Line Items]
Amortized Cost		2,992,513
Gross Unrealized Gains		301
Gross Unrealized Losses		(346,047)
Estimated Fair Value		$ 2,646,767

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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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