Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for sale
Amortized Cost	$ 1,137,702	$ 1,153,611
Gross Unrealized Gains	335	16,800
Gross Unrealized Losses	(140,479)	(9,599)
Fair Value	997,558	1,160,812
Held to maturity
Amortized Cost	2,022,748	1,552,443
Gross Unrealized Gains	374	20,954
Gross Unrealized Losses	(341,813)	(13,406)
Fair Value	1,681,309	1,559,991
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	294,329	118,595
Gross Unrealized Gains	0	82
Gross Unrealized Losses	(27,150)	(1,698)
Fair Value	267,179	116,979
Held to maturity
Amortized Cost	295,250	195,429
Gross Unrealized Gains	0	12
Gross Unrealized Losses	(49,237)	(1,215)
Fair Value	246,013	194,226
State and municipal
Available for sale
Amortized Cost	505,006	632,652
Gross Unrealized Gains	140	12,802
Gross Unrealized Losses	(71,602)	(5,708)
Fair Value	433,544	639,746
Held to maturity
Amortized Cost	1,127,669	862,461
Gross Unrealized Gains	374	20,719
Gross Unrealized Losses	(192,458)	(4,263)
Fair Value	935,585	878,917
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	33,011	60,600
Gross Unrealized Gains	0	989
Gross Unrealized Losses	(1,796)	(12)
Fair Value	31,215	61,577
Held to maturity
Amortized Cost	56,564	48,482
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(8,865)	(1,020)
Fair Value	47,699	47,465
Federal agency mortgage–backed pools
Available for sale
Amortized Cost	220,963	257,185
Gross Unrealized Gains	0	1,914
Gross Unrealized Losses	(30,307)	(1,408)
Fair Value	190,656	257,691
Held to maturity
Amortized Cost	343,953	247,937
Gross Unrealized Gains	0	209
Gross Unrealized Losses	(56,714)	(4,010)
Fair Value	287,239	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	35,466	40,447
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5,493)	(442)
Fair Value	29,973	40,005
Corporate notes
Available for sale
Amortized Cost	84,393	84,579
Gross Unrealized Gains	195	1,013
Gross Unrealized Losses	(9,624)	(773)
Fair Value	74,964	84,819
Held to maturity
Amortized Cost	163,846	157,687
Gross Unrealized Gains	0	11
Gross Unrealized Losses	(29,046)	(2,456)
Fair Value	$ 134,800	$ 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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