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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Securities, held-to-maturity, Amortized Cost	$ 51,838	$ 74,010
Securities held-to-maturity, Allowance for Credit Losses	(353)	(1,087)	$ (1,100)	$ (862)
Securities held-to-maturity, Net Carrying Amount	51,485	72,923
Securities held-to-maturity, Gross Unrecognized Losses	(6,767)	(7,168)
Securities held-to-maturity, Fair Value	44,718	65,755
Total Securities available for sale, before allowance for credit losses	1,506,798
Securities available-for-sale		956,418
Securities, available-for-sale, Unallocated portfolio layer basis adjustments		(2,254)
Total securities available for sale, net of allowance for credit losses		954,164
Total Securities available for sale, Allowance for Credit Losses	(2,627)	0
Total Securities available for sale, Gross Unrealized Gains	3,069	1,355
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(83,020)
Securities available-for-sale, Gross Unrealized Losses, Unallocated portfolio layer basis adjustments		2,254
Total Securities available for sale, Gross Unrealized Losses	(9,335)	(80,766)
Total Securities available for sale, Fair Value	1,497,905	874,753
Total Other Securities [Member]
Total Securities available for sale, before allowance for credit losses	593,928
Securities available-for-sale		538,429
Total Securities available for sale, Allowance for Credit Losses	(2,627)
Total Securities available for sale, Gross Unrealized Gains	1,938	1,338
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(19,358)
Total Securities available for sale, Gross Unrealized Losses	(6,970)
Total Securities available for sale, Fair Value	586,269	520,409
US States and Political Subdivisions Debt Securities [Member]
Securities, held-to-maturity, Amortized Cost	44,002	66,155
Securities held-to-maturity, Allowance for Credit Losses	(353)	(1,087)
Securities held-to-maturity, Net Carrying Amount	43,649	65,068
Securities held-to-maturity, Gross Unrecognized Losses	(5,834)	(6,371)
Securities held-to-maturity, Fair Value	37,815	58,697
Total Securities available for sale, before allowance for credit losses	20,627
Total Securities available for sale, Allowance for Credit Losses	(2,627)
Total Securities available for sale, Gross Unrealized Gains	0
Total Securities available for sale, Fair Value	18,000
US Government Agencies Debt Securities [Member]
Total Securities available for sale, before allowance for credit losses	8,804
Securities available-for-sale		82,548
Total Securities available for sale, Gross Unrealized Gains	77	123
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(937)
Total Securities available for sale, Gross Unrealized Losses	(33)
Total Securities available for sale, Fair Value	8,848	81,734
Corporate Debt Securities [Member]
Total Securities available for sale, before allowance for credit losses	130,882
Securities available-for-sale		173,184
Total Securities available for sale, Gross Unrealized Gains	735
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(17,735)
Total Securities available for sale, Gross Unrealized Losses	(6,368)
Total Securities available for sale, Fair Value	125,249	155,449
Mutual Fund Debt Securities [Member]
Total Securities available for sale, before allowance for credit losses	11,890
Securities available-for-sale		11,660
Total Securities available for sale, Gross Unrealized Gains	0
Total Securities available for sale, Fair Value	11,890	11,660
Collateralized Debt Obligations [Member]
Total Securities available for sale, before allowance for credit losses	420,260
Securities available-for-sale		269,600
Total Securities available for sale, Gross Unrealized Gains	1,126	1,215
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(686)
Total Securities available for sale, Gross Unrealized Losses	(569)
Total Securities available for sale, Fair Value	420,817	270,129
Other Debt Obligations
Total Securities available for sale, before allowance for credit losses	1,465
Securities available-for-sale		1,437
Total Securities available for sale, Gross Unrealized Gains	0
Total Securities available for sale, Fair Value	1,465	1,437
Collateralized Mortgage Backed Securities
Total Securities available for sale, before allowance for credit losses	912,870
Securities available-for-sale		417,989
Total Securities available for sale, Gross Unrealized Gains	1,131	17
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(63,662)
Total Securities available for sale, Gross Unrealized Losses	(2,365)
Total Securities available for sale, Fair Value	911,636	354,344
REMIC and CMO [Member]
Total Securities available for sale, before allowance for credit losses	707,540
Securities available-for-sale		160,165
Total Securities available for sale, Gross Unrealized Gains	1,107
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(26,591)
Total Securities available for sale, Gross Unrealized Losses	(1,067)
Total Securities available for sale, Fair Value	707,580	133,574
GNMA [Member]
Total Securities available for sale, before allowance for credit losses	30,099
Securities available-for-sale		12,402
Total Securities available for sale, Gross Unrealized Gains	0	3
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(1,740)
Total Securities available for sale, Gross Unrealized Losses	(154)
Total Securities available for sale, Fair Value	29,945	10,665
FNMA [Member]
Securities, held-to-maturity, Amortized Cost	7,836	7,855
Securities held-to-maturity, Net Carrying Amount	7,836	7,855
Securities held-to-maturity, Gross Unrecognized Losses	(933)	(797)
Securities held-to-maturity, Fair Value	6,903	7,058
Total Securities available for sale, before allowance for credit losses	99,183
Securities available-for-sale		155,995
Total Securities available for sale, Gross Unrealized Gains	11	14
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(20,935)
Total Securities available for sale, Gross Unrealized Losses	(1,048)
Total Securities available for sale, Fair Value	98,146	135,074
FHLMC [Member]
Total Securities available for sale, before allowance for credit losses	76,048
Securities available-for-sale		89,427
Total Securities available for sale, Gross Unrealized Gains	13
Securities available-for-sale, Gross Unrealized Losses excluding portfolio layer adjustments		(14,396)
Total Securities available for sale, Gross Unrealized Losses	(96)
Total Securities available for sale, Fair Value	$ 75,965	$ 75,031

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