LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Non-accrual loans (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 1,947	$ 3,270
Transfer into non-accrual	3,871	2,532
Loans paid down/payoffs	(770)	(299)
Loans return to accrual status	(150)	(50)
Loans charged off	(380)	(768)
Balance	4,518	4,685
Consumer
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	186	185
Transfer into non-accrual	134	44
Loans paid down/payoffs	(16)	(15)
Loans return to accrual status	(48)
Loans charged off	(40)	(92)
Balance	216	122
Residential Real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	956	2,124
Transfer into non-accrual	571	183
Loans paid down/payoffs	(628)	(41)
Loans charged off	(16)	(513)
Balance	883	1,753
Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	116	88
Transfer into non-accrual	334	305
Loans paid down/payoffs	(21)	(51)
Loans return to accrual status	(102)	(50)
Loans charged off	(297)	(163)
Balance	30	129
Commercial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	27	48
Transfer into non-accrual	86
Loans paid down/payoffs		(48)
Loans charged off	(27)
Balance	86
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	(105)	(136)
Balance	$ 3,303	$ 2,371