LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Non-accrual loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 1,947	$ 3,270
Transfer into non-accrual	4,006	2,532
Transfer to OREO		(705)
Loans paid down/payoffs	(1,056)	(299)
Loans return to accrual status	(193)	(50)
Loans charged off	(475)	(768)
Balance	4,229	4,685
Consumer
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	186	185
Transfer into non-accrual	135	44
Loans paid down/payoffs	(48)	(15)
Loans return to accrual status	(88)
Loans charged off	(41)	(92)
Balance	144	122
Residential Real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	956	2,124
Transfer into non-accrual	572	183
Loans paid down/payoffs	(755)	(41)
Loans charged off	(17)	(513)
Balance	756	1,753
Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	116	88
Transfer into non-accrual	467	305
Loans paid down/payoffs	(52)	(51)
Loans return to accrual status	(105)	(50)
Loans charged off	(390)	(163)
Balance	36	129
Commercial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	27	48
Transfer into non-accrual	86
Loans paid down/payoffs	(86)	(48)
Loans charged off	(27)
Construction
Financing Receivable Nonaccrual Status [Roll Forward]
Balance		318
Balance		310
Loans paid down/payoffs		(8)
Commercial Real Estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	662	507
Transfer into non-accrual	2,746	2,000
Loans paid down/payoffs	(115)	(136)
Balance	$ 3,293	$ 2,371