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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Available-for-sale
Amortized Cost	$ 791,533	$ 584,507
Gross Unrealized Gains	24,028	8,508
Gross Unrealized Losses	(763)	(611)
Fair Value	814,798	592,404
Held-to-maturity
Amortized Cost	74,510	88,477
Gross Unrealized Gains	4,381	2,276
Gross Unrealized Losses		(224)
Fair Value	78,891	90,529
Total Amortized Cost	866,043	672,984
Total Gross Unrealized Gains	28,409	10,784
Total Gross Unrealized Losses	(763)	(835)
Total Fair Value	893,689	682,933
U.S. government agency
Available-for-sale
Amortized Cost	100,462	49,113
Gross Unrealized Gains	3,866	529
Gross Unrealized Losses	(2)	(27)
Fair Value	104,326	49,615
Municipal securities
Available-for-sale
Amortized Cost	232,795	131,241
Gross Unrealized Gains	7,962	2,503
Gross Unrealized Losses	(347)	(6)
Fair Value	240,410	133,738
Held-to-maturity
Amortized Cost	26,830	45,239
Gross Unrealized Gains	1,480	1,340
Fair Value	28,310	46,579
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	220,970	198,184
Gross Unrealized Gains	5,462	2,780
Gross Unrealized Losses	(115)	(286)
Fair Value	226,317	200,678
Held-to-maturity
Amortized Cost	14,556	19,072
Gross Unrealized Gains	523	161
Gross Unrealized Losses		(170)
Fair Value	15,079	19,063
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	166,444	133,730
Gross Unrealized Gains	4,831	1,516
Gross Unrealized Losses	(203)	(292)
Fair Value	171,072	134,954
Held-to-maturity
Amortized Cost	33,124	24,166
Gross Unrealized Gains	2,378	775
Gross Unrealized Losses		(54)
Fair Value	35,502	24,887
Corporate
Available-for-sale
Amortized Cost	70,862	72,239
Gross Unrealized Gains	1,907	1,180
Gross Unrealized Losses	(96)
Fair Value	$ 72,673	$ 73,419

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