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Securities - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Available for sale
Amortized Cost	$ 616,744		$ 634,615
Gross Unrealized Gains	14		455
Gross Unrealized Losses	(75,588)		(87,819)
Fair Value	541,170		547,251
Held to maturity
Amortized Cost	1,888,537		1,945,795
Gross Unrealized Gains	1,713		1,185
Gross Unrealized Losses	(249,803)		(278,222)
Fair Value	1,640,447		1,668,758
Less: Allowance for credit losses	(158)	$ (158)	(157)	$ (159)	$ (164)	$ (257)
Held to maturity securities, net of allowance for credit losses	1,888,379		1,945,638
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	69,421		72,938
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(6,176)		(8,561)
Fair Value	63,245		64,377
Held to maturity
Amortized Cost	283,851		287,259
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(31,817)		(41,299)
Fair Value	252,034		245,960
State and municipal
Available for sale
Amortized Cost	351,507		353,299
Gross Unrealized Gains	14		0
Gross Unrealized Losses	(45,496)		(49,269)
Fair Value	306,025		304,030
Held to maturity
Amortized Cost	1,056,869		1,088,499
Gross Unrealized Gains	1,713		1,185
Gross Unrealized Losses	(150,262)		(150,323)
Fair Value	908,320		939,361
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	3,413		3,931
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(261)		(351)
Fair Value	3,152		3,580
Held to maturity
Amortized Cost	47,232		51,325
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(6,441)		(7,846)
Fair Value	40,791		43,479
Federal agency mortgage-backed pools
Available for sale
Amortized Cost	151,844		161,130
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(19,148)		(23,833)
Fair Value	132,696		137,297
Held to maturity
Amortized Cost	308,725		323,649
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(37,641)		(48,621)
Fair Value	271,084		275,028
Corporate notes
Available for sale
Amortized Cost	40,559		43,317
Gross Unrealized Gains	0		455
Gross Unrealized Losses	(4,507)		(5,805)
Fair Value	36,052		37,967
Held to maturity
Amortized Cost	161,885		162,734
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(20,206)		(25,538)
Fair Value	141,679		137,196
Private labeled mortgage-backed pools
Held to maturity
Amortized Cost	29,975		32,329
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(3,436)		(4,595)
Fair Value	$ 26,539		$ 27,734

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