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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 1,908,951	$ 1,769,134
Gross Unrealized Gains	5,451	1,603
Gross Unrealized Losses	(127,609)	(152,464)
Fair Value	1,786,793	1,618,273
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	851,900	751,219
Gross Unrealized Gains	8,198	7,294
Gross Unrealized Losses	(54,549)	(61,866)
Fair Value	805,549	696,647
Allowance for credit losses	(253)	(785)
Total securities held-to-maturity, net	851,647	750,434
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	311,531	316,511
Gross Unrealized Gains	639	303
Gross Unrealized Losses	(12,496)	(20,368)
Fair Value	299,674	296,446
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	493,704	500,881
Gross Unrealized Gains	70	57
Gross Unrealized Losses	(69,597)	(68,767)
Fair Value	424,177	432,171
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	680,211	575,699
Gross Unrealized Gains	7,942	7,078
Gross Unrealized Losses	(44,954)	(47,461)
Fair Value	643,199	535,316
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	921,704	758,283
Gross Unrealized Gains	4,672	1,181
Gross Unrealized Losses	(43,707)	(59,083)
Fair Value	882,669	700,381
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	49,168	52,100
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,868)	(5,424)
Fair Value	45,300	46,676
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	160,814	184,709
Gross Unrealized Gains	70	62
Gross Unrealized Losses	(1,189)	(3,070)
Fair Value	159,695	181,701
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	21,198	8,750
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(620)	(1,176)
Fair Value	20,578	7,574
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	122,521	123,420
Gross Unrealized Gains	256	216
Gross Unrealized Losses	(5,727)	(8,981)
Fair Value	$ 117,050	$ 114,655

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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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