Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 2,890,412	$ 2,738,293
Gross Unrealized Gains	6,342	16,865
Gross Unrealized Losses	(123,087)	(100,123)
Fair Value	2,773,667	2,655,035
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	1,055,697	1,075,102
Gross Unrealized Gains	5,393	11,186
Gross Unrealized Losses	(57,569)	(46,474)
Fair Value	1,003,521	1,039,814
ACL	(202)	(145)
Total securities held-to-maturity, net	1,055,495	1,074,957
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	163,598	187,587
Gross Unrealized Gains	7	76
Gross Unrealized Losses	(5,259)	(5,091)
Fair Value	158,346	182,572
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	644,842	626,900
Gross Unrealized Gains	1,929	3,914
Gross Unrealized Losses	(70,847)	(58,109)
Fair Value	575,924	572,705
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	907,676	920,199
Gross Unrealized Gains	5,055	10,861
Gross Unrealized Losses	(50,373)	(39,849)
Fair Value	862,358	891,211
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,910,623	1,733,003
Gross Unrealized Gains	4,189	12,638
Gross Unrealized Losses	(46,222)	(36,330)
Fair Value	1,868,590	1,709,311
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	37,244	43,839
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,262)	(3,199)
Fair Value	33,982	40,640
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	151,901	171,355
Gross Unrealized Gains	4	128
Gross Unrealized Losses	(665)	(499)
Fair Value	151,240	170,984
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	19,448	19,448
Gross Unrealized Gains	213	109
Gross Unrealized Losses	(94)	(94)
Fair Value	19,567	19,463
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	110,777	111,064
Gross Unrealized Gains	338	325
Gross Unrealized Losses	(3,934)	(3,426)
Fair Value	$ 107,181	$ 107,963

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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