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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 2,738,293	$ 2,025,483
Gross Unrealized Gains	16,865	1,187
Gross Unrealized Losses	(100,123)	(164,400)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	2,655,035	1,862,270
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	1,075,102	929,192
Gross Unrealized Gains	11,186	2,635
Gross Unrealized Losses	(46,474)	(72,956)
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Excluding Accrued Interest	(145)	(257)
Debt Securities, Held-to-maturity, Fair Value	1,039,814	858,871
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Total	1,074,957	928,935
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	187,587	290,329
Gross Unrealized Gains	76	69
Gross Unrealized Losses	(5,091)	(14,358)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	182,572	276,040
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	626,900	492,896
Gross Unrealized Gains	3,914	12
Gross Unrealized Losses	(58,109)	(83,711)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	572,705	409,197
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	920,199	759,059
Gross Unrealized Gains	10,861	2,366
Gross Unrealized Losses	(39,849)	(60,351)
Debt Securities, Held-to-maturity, Fair Value	891,211	701,074
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,733,003	1,090,495
Gross Unrealized Gains	12,638	1,072
Gross Unrealized Losses	(36,330)	(64,173)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	1,709,311	1,027,394
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	43,839	47,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,199)	(5,004)
Debt Securities, Held-to-maturity, Fair Value	40,640	42,908
US Treasury Bill Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	19,448	21,198
Gross Unrealized Gains	109	0
Gross Unrealized Losses	(94)	(452)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	19,463	20,746
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	171,355	130,565
Gross Unrealized Gains	128	34
Gross Unrealized Losses	(499)	(1,706)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	170,984	128,893
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	111,064	122,221
Gross Unrealized Gains	325	269
Gross Unrealized Losses	(3,426)	(7,601)
Debt Securities, Held-to-maturity, Fair Value	$ 107,963	$ 114,889

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