Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 1,788,664	$ 1,769,134
Gross Unrealized Gains	519	1,603
Gross Unrealized Losses	(173,253)	(152,464)
Fair Value	1,615,930	1,618,273
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	772,962	751,219
Gross Unrealized Gains	3,493	7,294
Gross Unrealized Losses	(72,935)	(61,866)
Fair Value	703,520	696,647
Allowance for credit losses	(314)	(785)
Total securities held-to-maturity, net	772,648	750,434
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	322,502	316,511
Gross Unrealized Gains	129	303
Gross Unrealized Losses	(19,675)	(20,368)
Fair Value	302,956	296,446
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	494,340	500,881
Gross Unrealized Gains	3	57
Gross Unrealized Losses	(86,102)	(68,767)
Fair Value	408,241	432,171
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	599,916	575,699
Gross Unrealized Gains	3,250	7,078
Gross Unrealized Losses	(57,686)	(47,461)
Fair Value	545,480	535,316
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	782,236	758,283
Gross Unrealized Gains	385	1,181
Gross Unrealized Losses	(63,613)	(59,083)
Fair Value	719,008	700,381
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	50,226	52,100
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5,630)	(5,424)
Fair Value	44,596	46,676
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	180,836	184,709
Gross Unrealized Gains	2	62
Gross Unrealized Losses	(2,943)	(3,070)
Fair Value	177,895	181,701
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	8,750	8,750
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(920)	(1,176)
Fair Value	7,830	7,574
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	122,820	123,420
Gross Unrealized Gains	243	216
Gross Unrealized Losses	(9,619)	(8,981)
Fair Value	$ 113,444	$ 114,655

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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