Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 1,730,232	$ 1,729,054
Gross Unrealized Gains	195	481
Gross Unrealized Losses	(180,052)	(193,728)
Fair Value	1,550,375	1,535,807
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	724,817	710,650
Gross Unrealized Gains	3,357	2,484
Gross Unrealized Losses	(75,030)	(84,617)
Fair Value	653,144	628,517
Allowance for credit losses	(858)	(735)
Total securities held-to-maturity, net	723,959	709,915
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	300,450	266,090
Gross Unrealized Gains	12	0
Gross Unrealized Losses	(27,320)	(28,305)
Fair Value	273,142	237,785
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	502,171	507,842
Gross Unrealized Gains	39	27
Gross Unrealized Losses	(79,842)	(90,425)
Fair Value	422,368	417,444
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	546,025	529,012
Gross Unrealized Gains	3,168	2,321
Gross Unrealized Losses	(57,023)	(65,347)
Fair Value	492,170	465,986
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	717,605	727,931
Gross Unrealized Gains	144	453
Gross Unrealized Losses	(67,007)	(68,980)
Fair Value	650,742	659,404
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	54,768	57,018
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6,232)	(6,416)
Fair Value	48,536	50,602
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	201,256	213,441
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(4,605)	(4,908)
Fair Value	196,651	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	(1,278)	(1,110)
Fair Value	7,472	12,640
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	124,024	124,620
Gross Unrealized Gains	189	163
Gross Unrealized Losses	(11,775)	(12,854)
Fair Value	$ 112,438	$ 111,929

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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