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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 2,136,252	$ 2,025,483
Gross Unrealized Gains	5,311	1,187
Gross Unrealized Losses	(151,495)	(164,400)
Fair Value	1,990,068	1,862,270
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	1,034,577	929,192
Gross Unrealized Gains	3,351	2,635
Gross Unrealized Losses	(77,579)	(72,956)
Fair Value	960,349	858,871
Allowance for credit losses	(295)	(257)
Total securities held-to-maturity, net	1,034,282	928,935
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	265,193	290,329
Gross Unrealized Gains	115	69
Gross Unrealized Losses	(11,415)	(14,358)
Fair Value	253,893	276,040
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	491,740	492,896
Gross Unrealized Gains	0	12
Gross Unrealized Losses	(88,416)	(83,711)
Fair Value	403,324	409,197
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	865,674	759,059
Gross Unrealized Gains	3,068	2,366
Gross Unrealized Losses	(67,180)	(60,351)
Fair Value	801,562	701,074
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,237,422	1,090,495
Gross Unrealized Gains	5,052	1,072
Gross Unrealized Losses	(50,185)	(64,173)
Fair Value	1,192,289	1,027,394
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	46,976	47,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,220)	(5,004)
Fair Value	42,756	42,908
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	120,699	130,565
Gross Unrealized Gains	44	34
Gross Unrealized Losses	(1,199)	(1,706)
Fair Value	119,544	128,893
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	21,198	21,198
Gross Unrealized Gains	100	0
Gross Unrealized Losses	(280)	(452)
Fair Value	21,018	20,746
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	121,927	122,221
Gross Unrealized Gains	283	269
Gross Unrealized Losses	(6,179)	(7,601)
Fair Value	$ 116,031	$ 114,889

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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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