Securities - Schedule of 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
Available for sale
Amortized Cost	$ 926,083		$ 282,022
Allowance for Credit Losses	(150)	$ (150)	0	$ 0	$ 0	$ 0
Total available for sale investment securities, amortized cost	925,933
Gross Unrealized Gains	4,986		0
Gross Unrealized Losses	(47,677)		(48,345)
Fair Value	883,242		233,677
Held to maturity
Amortized Cost	0		1,867,848
Allowance for Credit Losses	0
Net Carrying Amount	0
Gross Unrealized Gains	0		958
Gross Unrealized Losses	0		(302,538)
Fair Value	0		1,566,268
Less: Allowance for credit losses	0	$ (142)	(158)	$ (158)	$ (158)	$ (157)
Held to maturity securities, net of allowance for credit losses	0		1,867,690
Investment securities, held for trading	598		0
U.S. Treasury, federal agencies, and government sponsored agencies
Available for sale
Amortized Cost	31,836		2,258
Allowance for Credit Losses	0		0
Total available for sale investment securities, amortized cost	31,836
Gross Unrealized Gains	58		0
Gross Unrealized Losses	(58)		(457)
Fair Value	31,836		1,801
Held to maturity
Amortized Cost	0		278,383
Allowance for Credit Losses	0
Net Carrying Amount	0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		(39,253)
Fair Value	0		239,130
Investment securities, held for trading	598		0
State and municipal
Available for sale
Amortized Cost	354,290		243,521
Allowance for Credit Losses	0		0
Total available for sale investment securities, amortized cost	354,290
Gross Unrealized Gains	1,753		0
Gross Unrealized Losses	(40,715)		(41,687)
Fair Value	315,328		201,834
Held to maturity
Amortized Cost	0		1,048,862
Allowance for Credit Losses	0
Net Carrying Amount	0
Gross Unrealized Gains	0		958
Gross Unrealized Losses	0		(183,114)
Fair Value	0		866,706
Investment securities, held for trading	0		0
U.S. government agency mortgage-backed securities
Available for sale
Amortized Cost	491,207		17,984
Allowance for Credit Losses	0		0
Total available for sale investment securities, amortized cost	491,207
Gross Unrealized Gains	3,175		0
Gross Unrealized Losses	(480)		(3,441)
Fair Value	493,902		14,543
Held to maturity
Amortized Cost	0		349,726
Allowance for Credit Losses	0
Net Carrying Amount	0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		(54,904)
Fair Value	0		294,822
Investment securities, held for trading	0		0
Private labeled mortgage-backed pools
Held to maturity
Amortized Cost	0		29,278
Allowance for Credit Losses	0
Net Carrying Amount	0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		(3,958)
Fair Value	0		25,320
Corporate notes
Available for sale
Amortized Cost	48,750		18,259
Allowance for Credit Losses	(150)		0
Total available for sale investment securities, amortized cost	48,600
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(6,424)		(2,760)
Fair Value	42,176		15,499
Held to maturity
Amortized Cost	0		161,599
Allowance for Credit Losses	0
Net Carrying Amount	0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		(21,309)
Fair Value	0		140,290
Investment securities, held for trading	$ 0		$ 0