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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available for sale
Amortized Cost	$ 1,147,467	$ 1,153,611
Gross Unrealized Gains	209	16,800
Gross Unrealized Losses	(162,021)	(9,599)
Fair Value	985,655	1,160,812
Held to maturity
Amortized Cost	2,031,536	1,552,443
Gross Unrealized Gains	10	20,954
Gross Unrealized Losses	(390,957)	(13,406)
Fair Value	1,640,589	1,559,991
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	293,974	118,595
Gross Unrealized Gains	0	82
Gross Unrealized Losses	(27,720)	(1,698)
Fair Value	266,254	116,979
Held to maturity
Amortized Cost	295,363	195,429
Gross Unrealized Gains	0	12
Gross Unrealized Losses	(47,355)	(1,215)
Fair Value	248,008	194,226
State and municipal
Available for sale
Amortized Cost	505,975	632,652
Gross Unrealized Gains	0	12,802
Gross Unrealized Losses	(90,729)	(5,708)
Fair Value	415,246	639,746
Held to maturity
Amortized Cost	1,128,034	862,461
Gross Unrealized Gains	10	20,719
Gross Unrealized Losses	(242,141)	(4,263)
Fair Value	885,903	878,917
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	36,269	60,600
Gross Unrealized Gains	0	989
Gross Unrealized Losses	(1,645)	(12)
Fair Value	34,624	61,577
Held to maturity
Amortized Cost	57,972	48,482
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(8,292)	(1,020)
Fair Value	49,680	47,465
Federal agency mortgage-backed pools
Available for sale
Amortized Cost	226,785	257,185
Gross Unrealized Gains	0	1,914
Gross Unrealized Losses	(32,144)	(1,408)
Fair Value	194,641	257,691
Held to maturity
Amortized Cost	349,875	247,937
Gross Unrealized Gains	0	209
Gross Unrealized Losses	(57,359)	(4,010)
Fair Value	292,516	244,136
Private labeled mortgage-backed pools
Available for sale
Amortized Cost		0
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		0
Held to maturity
Amortized Cost	36,171	40,447
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5,404)	(442)
Fair Value	30,767	40,005
Corporate notes
Available for sale
Amortized Cost	84,464	84,579
Gross Unrealized Gains	209	1,013
Gross Unrealized Losses	(9,783)	(773)
Fair Value	74,890	84,819
Held to maturity
Amortized Cost	164,121	157,687
Gross Unrealized Gains	0	11
Gross Unrealized Losses	(30,406)	(2,456)
Fair Value	$ 133,715	$ 155,242

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