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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Securities
Securities, held-to-maturity, Amortized Cost	$ 50,860		$ 51,838
Securities held-to-maturity, Allowance for Credit Losses	(351)	$ (355)	(353)	$ (1,086)	$ (1,089)	$ (1,087)
Securities held-to-maturity, Net Carrying Amount	50,509		51,485
Securities held-to-maturity, Gross Unrecognized Losses	(4,125)		(6,767)
Securities held-to-maturity, Fair Value	46,384		44,718
Total Securities available for sale, before allowance for credit losses	1,541,505		1,506,798
Total Securities available for sale, Allowance for Credit Losses	(2,921)	$ (3,066)	(2,627)	$ 0
Total Securities available for sale, Gross Unrealized Gains	8,764		3,069
Total Securities available for sale, Gross Unrealized Losses	(5,925)		(9,335)
Total Securities available for sale, Fair Value	1,541,423		1,497,905
Total other securities
Securities
Total Securities available for sale, before allowance for credit losses	640,995		593,928
Total Securities available for sale, Allowance for Credit Losses	(2,921)		(2,627)
Total Securities available for sale, Gross Unrealized Gains	2,651		1,938
Total Securities available for sale, Gross Unrealized Losses	(5,572)		(6,970)
Total Securities available for sale, Fair Value	635,153		586,269
Municipals
Securities
Securities, held-to-maturity, Amortized Cost	43,039		44,002
Securities held-to-maturity, Allowance for Credit Losses	(351)		(353)
Securities held-to-maturity, Net Carrying Amount	42,688		43,649
Securities held-to-maturity, Gross Unrecognized Losses	(3,492)		(5,834)
Securities held-to-maturity, Fair Value	39,196		37,815
Total Securities available for sale, before allowance for credit losses	20,627		20,627
Total Securities available for sale, Allowance for Credit Losses	(2,921)		(2,627)
Total Securities available for sale, Gross Unrealized Losses	(428)
Total Securities available for sale, Fair Value	17,278		18,000
U.S. government agencies
Securities
Total Securities available for sale, before allowance for credit losses	6,836		8,804
Total Securities available for sale, Gross Unrealized Gains	24		77
Total Securities available for sale, Gross Unrealized Losses	(43)		(33)
Total Securities available for sale, Fair Value	6,817		8,848
Corporate
Securities
Total Securities available for sale, before allowance for credit losses	201,329		130,882
Total Securities available for sale, Gross Unrealized Gains	2,381		735
Total Securities available for sale, Gross Unrealized Losses	(3,580)		(6,368)
Total Securities available for sale, Fair Value	200,130		125,249
Mutual funds
Securities
Total Securities available for sale, before allowance for credit losses	12,502		11,890
Total Securities available for sale, Fair Value	12,502		11,890
Collateralized loan obligations
Securities
Total Securities available for sale, before allowance for credit losses	398,210		420,260
Total Securities available for sale, Gross Unrealized Gains	246		1,126
Total Securities available for sale, Gross Unrealized Losses	(1,521)		(569)
Total Securities available for sale, Fair Value	396,935		420,817
Other
Securities
Total Securities available for sale, before allowance for credit losses	1,491		1,465
Total Securities available for sale, Fair Value	1,491		1,465
Collateralized Mortgage Backed Securities
Securities
Total Securities available for sale, before allowance for credit losses	900,510		912,870
Total Securities available for sale, Gross Unrealized Gains	6,113		1,131
Total Securities available for sale, Gross Unrealized Losses	(353)		(2,365)
Total Securities available for sale, Fair Value	906,270		911,636
REMIC and CMO
Securities
Total Securities available for sale, before allowance for credit losses	698,119		707,540
Total Securities available for sale, Gross Unrealized Gains	4,140		1,107
Total Securities available for sale, Gross Unrealized Losses	(326)		(1,067)
Total Securities available for sale, Fair Value	701,933		707,580
GNMA
Securities
Total Securities available for sale, before allowance for credit losses	42,678		30,099
Total Securities available for sale, Gross Unrealized Gains	215
Total Securities available for sale, Gross Unrealized Losses	(20)		(154)
Total Securities available for sale, Fair Value	42,873		29,945
FNMA
Securities
Securities, held-to-maturity, Amortized Cost	7,821		7,836
Securities held-to-maturity, Net Carrying Amount	7,821		7,836
Securities held-to-maturity, Gross Unrecognized Losses	(633)		(933)
Securities held-to-maturity, Fair Value	7,188		6,903
Total Securities available for sale, before allowance for credit losses	70,873		99,183
Total Securities available for sale, Gross Unrealized Gains	490		11
Total Securities available for sale, Gross Unrealized Losses	(7)		(1,048)
Total Securities available for sale, Fair Value	71,356		98,146
FHLMC
Securities
Total Securities available for sale, before allowance for credit losses	88,840		76,048
Total Securities available for sale, Gross Unrealized Gains	1,268		13
Total Securities available for sale, Gross Unrealized Losses			(96)
Total Securities available for sale, Fair Value	$ 90,108		$ 75,965

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