GOODWILL AND INTANGIBLE ASSETS - Changes in carrying values of goodwill and intangible assets (Details) - Changes in carrying values of goodwill and intangible assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Balance, beginning of period	$ 13,815	$ 13,815	$ 12,552
Additions			1,263
Impairment
Balance, end of period	13,815	13,815	13,815
Core Deposit Intangibles
Cost, beginning of period	5,881	5,881	5,248
Additions			633
Cost, end of period	5,881	5,881	5,881
Amortization, beginning of period	(4,498)	(4,044)	(3,511)
Amortization	(388)	(454)	(533)
Amortization, end of period	(4,886)	(4,498)	(4,044)
Core deposit intangibles, net	$ 995	$ 1,383	$ 1,837