Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 2,453,762	$ 2,025,483
Gross Unrealized Gains	14,551	1,187
Gross Unrealized Losses	(116,820)	(164,400)
Fair Value	2,351,493	1,862,270
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	1,082,017	929,192
Gross Unrealized Gains	7,311	2,635
Gross Unrealized Losses	(56,967)	(72,956)
Fair Value	1,032,361	858,871
Allowance for credit losses	(170)	(257)
Total securities held-to-maturity, net	1,081,847	928,935
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	252,046	290,329
Gross Unrealized Gains	158	69
Gross Unrealized Losses	(7,698)	(14,358)
Fair Value	244,506	276,040
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	590,182	492,896
Gross Unrealized Gains	2,226	12
Gross Unrealized Losses	(67,662)	(83,711)
Fair Value	524,746	409,197
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	925,829	759,059
Gross Unrealized Gains	6,999	2,366
Gross Unrealized Losses	(49,430)	(60,351)
Fair Value	883,398	701,074
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,473,138	1,090,495
Gross Unrealized Gains	11,987	1,072
Gross Unrealized Losses	(40,573)	(64,173)
Fair Value	1,444,552	1,027,394
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	44,837	47,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,509)	(5,004)
Fair Value	41,328	42,908
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	114,698	130,565
Gross Unrealized Gains	60	34
Gross Unrealized Losses	(717)	(1,706)
Fair Value	114,041	128,893
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	23,698	21,198
Gross Unrealized Gains	120	0
Gross Unrealized Losses	(170)	(452)
Fair Value	23,648	20,746
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	111,351	122,221
Gross Unrealized Gains	312	269
Gross Unrealized Losses	(4,028)	(7,601)
Fair Value	$ 107,635	$ 114,889

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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