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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	$ 2,335,605	$ 2,025,483
Gross Unrealized Gains	8,842	1,187
Gross Unrealized Losses	(139,936)	(164,400)
Fair Value	2,204,511	1,862,270
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	1,091,533	929,192
Gross Unrealized Gains	2,669	2,635
Gross Unrealized Losses	(77,813)	(72,956)
Fair Value	1,016,389	858,871
Allowance for credit losses	(295)	(257)
Total securities held-to-maturity, net	1,091,238	928,935
Obligations of U.S. Government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	252,037	290,329
Gross Unrealized Gains	125	69
Gross Unrealized Losses	(9,792)	(14,358)
Fair Value	242,370	276,040
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	547,277	492,896
Gross Unrealized Gains	257	12
Gross Unrealized Losses	(83,482)	(83,711)
Fair Value	464,052	409,197
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	928,973	759,059
Gross Unrealized Gains	2,372	2,366
Gross Unrealized Losses	(68,867)	(60,351)
Fair Value	862,478	701,074
Agency mortgage-backed securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	1,395,601	1,090,495
Gross Unrealized Gains	8,368	1,072
Gross Unrealized Losses	(45,459)	(64,173)
Fair Value	1,358,510	1,027,394
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	45,922	47,912
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3,866)	(5,004)
Fair Value	42,056	42,908
U.S. Treasury bills
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	116,992	130,565
Gross Unrealized Gains	11	34
Gross Unrealized Losses	(948)	(1,706)
Fair Value	116,055	128,893
Corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost	23,698	21,198
Gross Unrealized Gains	81	0
Gross Unrealized Losses	(255)	(452)
Fair Value	23,524	20,746
Debt Securities, Held-to-maturity [Abstract]
Amortized Cost	116,638	122,221
Gross Unrealized Gains	297	269
Gross Unrealized Losses	(5,080)	(7,601)
Fair Value	$ 111,855	$ 114,889

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