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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale
Amortized Cost	$ 600,066	$ 584,507
Gross Unrealized Gains	16,762	8,508
Gross Unrealized Losses	(1,263)	(611)
Fair Value	615,565	592,404
Held-to-maturity
Amortized Cost	79,741	88,477
Gross Unrealized Gains	3,842	2,276
Gross Unrealized Losses	(19)	(224)
Fair Value	83,564	90,529
Total Amortized Cost	679,807	672,984
Total Gross Unrealized Gains	20,604	10,784
Total Gross Unrealized Losses	(1,282)	(835)
Total Fair Value	699,129	682,933
U.S. government agency
Available-for-sale
Amortized Cost	48,983	49,113
Gross Unrealized Gains	2,192	529
Gross Unrealized Losses		(27)
Fair Value	51,175	49,615
Municipal securities
Available-for-sale
Amortized Cost	164,853	131,241
Gross Unrealized Gains	3,577	2,503
Gross Unrealized Losses	(185)	(6)
Fair Value	168,245	133,738
Held-to-maturity
Amortized Cost	32,780	45,239
Gross Unrealized Gains	1,198	1,340
Fair Value	33,978	46,579
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	184,507	198,184
Gross Unrealized Gains	5,015	2,780
Gross Unrealized Losses	(904)	(286)
Fair Value	188,618	200,678
Held-to-maturity
Amortized Cost	17,989	19,072
Gross Unrealized Gains	471	161
Gross Unrealized Losses	(16)	(170)
Fair Value	18,444	19,063
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	128,583	133,730
Gross Unrealized Gains	4,050	1,516
Gross Unrealized Losses	(116)	(292)
Fair Value	132,517	134,954
Held-to-maturity
Amortized Cost	28,972	24,166
Gross Unrealized Gains	2,173	775
Gross Unrealized Losses	(3)	(54)
Fair Value	31,142	24,887
Corporate
Available-for-sale
Amortized Cost	73,140	72,239
Gross Unrealized Gains	1,928	1,180
Gross Unrealized Losses	(58)
Fair Value	$ 75,010	$ 73,419

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