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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Available-for-sale
Amortized Cost	$ 899,700	$ 584,507
Gross Unrealized Gains	24,260	8,508
Gross Unrealized Losses	(1,091)	(611)
Fair Value	922,869	592,404
Held-to-maturity
Amortized Cost	68,395	88,477
Gross Unrealized Gains	4,064	2,276
Gross Unrealized Losses	(18)	(224)
Fair Value	72,441	90,529
Total Amortized Cost	968,095	672,984
Total Gross Unrealized Gains	28,324	10,784
Total Gross Unrealized Losses	(1,109)	(835)
Total Fair Value	995,310	682,933
U.S. government agency
Available-for-sale
Amortized Cost	118,282	49,113
Gross Unrealized Gains	3,720	529
Gross Unrealized Losses	(9)	(27)
Fair Value	121,993	49,615
Municipal securities
Available-for-sale
Amortized Cost	265,309	131,241
Gross Unrealized Gains	9,232	2,503
Gross Unrealized Losses	(280)	(6)
Fair Value	274,261	133,738
Held-to-maturity
Amortized Cost	22,484	45,239
Gross Unrealized Gains	1,390	1,340
Fair Value	23,874	46,579
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	198,543	198,184
Gross Unrealized Gains	4,871	2,780
Gross Unrealized Losses	(162)	(286)
Fair Value	203,252	200,678
Held-to-maturity
Amortized Cost	13,031	19,072
Gross Unrealized Gains	452	161
Gross Unrealized Losses		(170)
Fair Value	13,483	19,063
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	246,649	133,730
Gross Unrealized Gains	4,651	1,516
Gross Unrealized Losses	(534)	(292)
Fair Value	250,766	134,954
Held-to-maturity
Amortized Cost	32,880	24,166
Gross Unrealized Gains	2,222	775
Gross Unrealized Losses	(18)	(54)
Fair Value	35,084	24,887
Corporate
Available-for-sale
Amortized Cost	70,917	72,239
Gross Unrealized Gains	1,786	1,180
Gross Unrealized Losses	(106)
Fair Value	$ 72,597	$ 73,419

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Debt Securities Available For Sale And Held To Maturity Amortized Cost

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