Securities - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Available for sale
Amortized Cost	$ 280,049		$ 282,022
Allowance for Credit Losses	(150)	$ 0	0	$ 0	$ 0	$ 0
Total available for sale investment securities, amortized cost	279,899
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(47,900)		(48,345)
Fair Value	231,999		233,677
Held to maturity
Amortized Cost	1,819,229		1,867,848
Allowance for Credit Losses	(142)
Net Carrying Amount	1,819,087
Gross Unrealized Gains	948		958
Gross Unrealized Losses	(283,197)		(302,538)
Fair Value	1,536,980		1,566,268
Less: Allowance for credit losses	(142)	$ (140)	(158)	$ (158)	$ (158)	$ (157)
Held to maturity securities, net of allowance for credit losses	1,819,087		1,867,690
U.S. Treasury, federal agencies, and government sponsored agencies
Available for sale
Amortized Cost	2,143		2,258
Allowance for Credit Losses	0		0
Total available for sale investment securities, amortized cost	2,143
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(391)		(457)
Fair Value	1,752		1,801
Held to maturity
Amortized Cost	275,720		278,383
Allowance for Credit Losses	0
Net Carrying Amount	275,720
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(32,635)		(39,253)
Fair Value	243,085		239,130
State and municipal
Available for sale
Amortized Cost	242,682		243,521
Allowance for Credit Losses	0		0
Total available for sale investment securities, amortized cost	242,682
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(40,941)		(41,687)
Fair Value	201,741		201,834
Held to maturity
Amortized Cost	1,023,861		1,048,862
Allowance for Credit Losses	(13)
Net Carrying Amount	1,023,848
Gross Unrealized Gains	948		958
Gross Unrealized Losses	(187,047)		(183,114)
Fair Value	837,762		866,706
U.S. government agency mortgage-backed securities
Available for sale
Amortized Cost	16,967		17,984
Allowance for Credit Losses	0		0
Total available for sale investment securities, amortized cost	16,967
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(2,872)		(3,441)
Fair Value	14,095		14,543
Held to maturity
Amortized Cost	335,333		349,726
Allowance for Credit Losses	0
Net Carrying Amount	335,333
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(43,481)		(54,904)
Fair Value	291,852		294,822
Private labeled mortgage-backed pools
Held to maturity
Amortized Cost	27,816		29,278
Allowance for Credit Losses	(1)
Net Carrying Amount	27,815
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(3,372)		(3,958)
Fair Value	24,444		25,320
Corporate notes
Available for sale
Amortized Cost	18,257		18,259
Allowance for Credit Losses	(150)		0
Total available for sale investment securities, amortized cost	18,107
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(3,696)		(2,760)
Fair Value	14,411		15,499
Held to maturity
Amortized Cost	156,499		161,599
Allowance for Credit Losses	(128)
Net Carrying Amount	156,371
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(16,662)		(21,309)
Fair Value	$ 139,837		$ 140,290