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Securities - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Available for sale
Amortized Cost	$ 623,428		$ 634,615
Gross Unrealized Gains	2		455
Gross Unrealized Losses	(96,376)		(87,819)
Fair Value	527,054		547,251
Held to maturity
Amortized Cost	1,904,439		1,945,795
Gross Unrealized Gains	160		1,185
Gross Unrealized Losses	(307,612)		(278,222)
Fair Value	1,596,987		1,668,758
Allowance for Credit Losses	(158)	$ (158)	(157)	$ 0	$ 0	$ 0
Net Carrying Amount	1,904,281		1,945,638
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	71,419		72,938
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(8,754)		(8,561)
Fair Value	62,665		64,377
Held to maturity
Amortized Cost	284,114		287,259
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(41,917)		(41,299)
Fair Value	242,197		245,960
Allowance for Credit Losses	0		0
Net Carrying Amount	284,114		287,259
State and municipal
Available for sale
Amortized Cost	352,223		353,299
Gross Unrealized Gains	2		0
Gross Unrealized Losses	(57,389)		(49,269)
Fair Value	294,836		304,030
Held to maturity
Amortized Cost	1,064,638		1,088,499
Gross Unrealized Gains	160		1,185
Gross Unrealized Losses	(178,390)		(150,323)
Fair Value	886,408		939,361
Allowance for Credit Losses	(21)		(20)
Net Carrying Amount	1,064,617		1,088,479
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	3,702		3,931
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(368)		(351)
Fair Value	3,334		3,580
Held to maturity
Amortized Cost	48,668		51,325
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(8,128)		(7,846)
Fair Value	40,540		43,479
Allowance for Credit Losses	0		0
Net Carrying Amount	48,668		51,325
Federal agency mortgage-backed pools
Available for sale
Amortized Cost	154,479		161,130
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(24,161)		(23,833)
Fair Value	130,318		137,297
Held to maturity
Amortized Cost	314,069		323,649
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(49,255)		(48,621)
Fair Value	264,814		275,028
Allowance for Credit Losses	0		0
Net Carrying Amount	314,069		323,649
Corporate notes
Available for sale
Amortized Cost	41,605		43,317
Gross Unrealized Gains	0		455
Gross Unrealized Losses	(5,704)		(5,805)
Fair Value	35,901		37,967
Held to maturity
Amortized Cost	162,170		162,734
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(25,388)		(25,538)
Fair Value	136,782		137,196
Allowance for Credit Losses	(130)		(130)
Net Carrying Amount	162,040		162,604
Private labeled mortgage-backed pools
Held to maturity
Amortized Cost	30,780		32,329
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(4,534)		(4,595)
Fair Value	26,246		27,734
Allowance for Credit Losses	(7)		(7)
Net Carrying Amount	$ 30,773		$ 32,322

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