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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 1,722,117	$ 1,729,054
Gross Unrealized Gains	8	481
Gross Unrealized Losses	(235,021)	(193,728)
Fair Value	1,487,104	1,535,807
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	731,440	710,650
Gross Unrealized Gains	270	2,484
Gross Unrealized Losses	(109,050)	(84,617)
Fair Value	622,660	628,517
Allowance for credit losses	(785)	(735)
Total securities held-to-maturity, net	730,655	709,915
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	308,181	266,090
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(28,724)	(28,305)
Fair Value	279,457	237,785
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	501,515	507,842
Gross Unrealized Gains	8	27
Gross Unrealized Losses	(114,089)	(90,425)
Fair Value	387,434	417,444
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	554,459	529,012
Gross Unrealized Gains	68	2,321
Gross Unrealized Losses	(87,975)	(65,347)
Fair Value	466,552	465,986
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	713,896	727,931
Gross Unrealized Gains	0	453
Gross Unrealized Losses	(85,926)	(68,980)
Fair Value	627,970	659,404
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	53,259	57,018
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,477)	(6,416)
Fair Value	45,782	50,602
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	189,775	213,441
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(4,984)	(4,908)
Fair Value	184,791	208,534
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	8,750	13,750
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,298)	(1,110)
Fair Value	7,452	12,640
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	123,722	124,620
Gross Unrealized Gains	202	163
Gross Unrealized Losses	(13,598)	(12,854)
Fair Value	$ 110,326	$ 111,929

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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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