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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale
Amortized Cost	$ 679,264	$ 584,507
Gross Unrealized Gains	22,323	8,508
Gross Unrealized Losses	(234)	(611)
Fair Value	701,353	592,404
Held-to-maturity
Amortized Cost	73,823	88,477
Gross Unrealized Gains	4,494	2,276
Gross Unrealized Losses		(224)
Fair Value	78,317	90,529
Total Amortized Cost	753,087	672,984
Total Gross Unrealized Gains	26,817	10,784
Total Gross Unrealized Losses	(234)	(835)
Total Fair Value	779,670	682,933
U.S. government agency
Available-for-sale
Amortized Cost	75,881	49,113
Gross Unrealized Gains	3,061	529
Gross Unrealized Losses	(7)	(27)
Fair Value	78,935	49,615
Municipal securities
Available-for-sale
Amortized Cost	191,453	131,241
Gross Unrealized Gains	6,885	2,503
Gross Unrealized Losses	(28)	(6)
Fair Value	198,310	133,738
Held-to-maturity
Amortized Cost	28,528	45,239
Gross Unrealized Gains	1,507	1,340
Fair Value	30,035	46,579
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	211,577	198,184
Gross Unrealized Gains	5,393	2,780
Gross Unrealized Losses	(101)	(286)
Fair Value	216,869	200,678
Held-to-maturity
Amortized Cost	16,516	19,072
Gross Unrealized Gains	567	161
Gross Unrealized Losses		(170)
Fair Value	17,083	19,063
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	133,149	133,730
Gross Unrealized Gains	5,022	1,516
Gross Unrealized Losses	(22)	(292)
Fair Value	138,149	134,954
Held-to-maturity
Amortized Cost	28,779	24,166
Gross Unrealized Gains	2,420	775
Gross Unrealized Losses		(54)
Fair Value	31,199	24,887
Corporate
Available-for-sale
Amortized Cost	67,204	72,239
Gross Unrealized Gains	1,962	1,180
Gross Unrealized Losses	(76)
Fair Value	$ 69,090	$ 73,419

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