Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available for sale
Amortized Cost	$ 1,162,976	$ 1,153,611
Gross Unrealized Gains	462	16,800
Gross Unrealized Losses	(122,418)	(9,599)
Fair Value	1,041,020	1,160,812
Held to maturity
Amortized Cost	2,052,772	1,552,443
Gross Unrealized Gains	456	20,954
Gross Unrealized Losses	(299,014)	(13,406)
Fair Value	1,754,214	1,559,991
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	294,793	118,595
Gross Unrealized Gains	0	82
Gross Unrealized Losses	(19,617)	(1,698)
Fair Value	275,176	116,979
Held to maturity
Amortized Cost	295,386	195,429
Gross Unrealized Gains	0	12
Gross Unrealized Losses	(34,138)	(1,215)
Fair Value	261,248	194,226
State and municipal
Available for sale
Amortized Cost	507,128	632,652
Gross Unrealized Gains	256	12,802
Gross Unrealized Losses	(69,217)	(5,708)
Fair Value	438,167	639,746
Held to maturity
Amortized Cost	1,135,751	862,461
Gross Unrealized Gains	456	20,719
Gross Unrealized Losses	(184,215)	(4,263)
Fair Value	951,992	878,917
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	41,329	60,600
Gross Unrealized Gains	0	989
Gross Unrealized Losses	(1,043)	(12)
Fair Value	40,286	61,577
Held to maturity
Amortized Cost	59,694	48,482
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(6,160)	(1,020)
Fair Value	53,534	47,465
Federal agency mortgage-backed pools
Available for sale
Amortized Cost	235,337	257,185
Gross Unrealized Gains	8	1,914
Gross Unrealized Losses	(24,860)	(1,408)
Fair Value	210,485	257,691
Held to maturity
Amortized Cost	360,446	247,937
Gross Unrealized Gains	0	209
Gross Unrealized Losses	(46,620)	(4,010)
Fair Value	313,826	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	37,101	40,447
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,346)	(442)
Fair Value	32,755	40,005
Corporate notes
Available for sale
Amortized Cost	84,389	84,579
Gross Unrealized Gains	198	1,013
Gross Unrealized Losses	(7,681)	(773)
Fair Value	76,906	84,819
Held to maturity
Amortized Cost	164,394	157,687
Gross Unrealized Gains	0	11
Gross Unrealized Losses	(23,535)	(2,456)
Fair Value	$ 140,859	$ 155,242

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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