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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Available for sale
Amortized Cost	$ 1,662,254	$ 1,090,363
Gross Unrealized Gains	34,968	43,985
Gross Unrealized Losses	(6,036)	(323)
Fair Value	1,691,186	1,134,025
Held to maturity
Amortized Cost	153,284	168,676
Gross Unrealized Gains	9,367	11,314
Gross Unrealized Losses	0	0
Fair Value	162,651	179,990
U.S. Treasury and federal agencies
Available for sale
Amortized Cost	191,490	19,750
Gross Unrealized Gains	228	0
Gross Unrealized Losses	(617)	(35)
Fair Value	191,101	19,715
State and municipal
Available for sale
Amortized Cost	1,090,693	803,100
Gross Unrealized Gains	27,993	35,014
Gross Unrealized Losses	(5,193)	(271)
Fair Value	1,113,493	837,843
Held to maturity
Amortized Cost	144,430	157,421
Gross Unrealized Gains	9,176	11,035
Gross Unrealized Losses	0	0
Fair Value	153,606	168,456
Federal agency collateralized mortgage obligations
Available for sale
Amortized Cost	96,344	144,022
Gross Unrealized Gains	2,280	3,448
Gross Unrealized Losses	(2)	(17)
Fair Value	98,622	147,453
Held to maturity
Amortized Cost	1,007	2,661
Gross Unrealized Gains	16	36
Gross Unrealized Losses	0	0
Fair Value	1,023	2,697
Federal agency mortgage-backed pools
Available for sale
Amortized Cost	165,016	114,484
Gross Unrealized Gains	2,641	4,315
Gross Unrealized Losses	(147)	0
Fair Value	167,510	118,799
Held to maturity
Amortized Cost	3,733	8,594
Gross Unrealized Gains	175	243
Gross Unrealized Losses	0	0
Fair Value	3,908	8,837
Private labeled mortgage-backed pools
Available for sale
Amortized Cost	33,074
Gross Unrealized Gains	508
Gross Unrealized Losses	(14)
Fair Value	33,568	0
Held to maturity
Amortized Cost	4,114	0
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	4,114	0
Corporate notes
Available for sale
Amortized Cost	85,637	9,007
Gross Unrealized Gains	1,318	1,208
Gross Unrealized Losses	(63)	0
Fair Value	$ 86,892	$ 10,215

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