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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available-for-sale
Amortized Cost	$ 584,507	$ 684,087
Gross Unrealized Gains	8,508	2,293
Gross Unrealized Losses	(611)	(6,854)
Fair Value	592,404	679,526
Held-to-maturity
Amortized Cost	88,477	121,715
Gross Unrealized Gains	2,276	1,326
Gross Unrealized Losses	(224)	(1,535)
Fair Value	90,529	121,506
U.S. government agency
Available-for-sale
Amortized Cost	49,113	46,977
Gross Unrealized Gains	529	250
Gross Unrealized Losses	(27)	(361)
Fair Value	49,615	46,866
Municipal securities
Available-for-sale
Amortized Cost	131,241	161,957
Gross Unrealized Gains	2,503	761
Gross Unrealized Losses	(6)	(1,268)
Fair Value	133,738	161,450
Held-to-maturity
Amortized Cost	45,239	73,176
Gross Unrealized Gains	1,340	1,149
Gross Unrealized Losses		(42)
Fair Value	46,579	74,283
Mortgage-backed: Agency residential
Available-for-sale
Amortized Cost	198,184	235,903
Gross Unrealized Gains	2,780	788
Gross Unrealized Losses	(286)	(2,388)
Fair Value	200,678	234,303
Held-to-maturity
Amortized Cost	19,072	23,192
Gross Unrealized Gains	161
Gross Unrealized Losses	(170)	(998)
Fair Value	19,063	22,194
Mortgage-backed: Agency commercial
Available-for-sale
Amortized Cost	133,730	151,878
Gross Unrealized Gains	1,516	285
Gross Unrealized Losses	(292)	(2,082)
Fair Value	134,954	150,081
Held-to-maturity
Amortized Cost	24,166	25,347
Gross Unrealized Gains	775	177
Gross Unrealized Losses	(54)	(495)
Fair Value	24,887	25,029
Mortgage-backed: Private-label
Available-for-sale
Amortized Cost		254
Gross Unrealized Gains		2
Fair Value		256
Corporate
Available-for-sale
Amortized Cost	72,239	87,118
Gross Unrealized Gains	1,180	207
Gross Unrealized Losses		(755)
Fair Value	$ 73,419	$ 86,570

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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