LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Non-accrual loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 3,270	$ 3,751
Transfer into non-accrual	2,989	1,418
Transfer to OREO	(705)
Loans paid down/payoffs	(2,900)	(606)
Loans return to accrual status	(262)	(341)
Loans charged off	(936)	(356)
Balance	2,162	3,866
Consumer
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	185	403
Transfer into non-accrual	261	6
Loans paid down/payoffs	(20)	(77)
Loans return to accrual status		(47)
Loans charged off	(92)	(4)
Balance	334	281
Residential Real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	2,124	2,508
Transfer into non-accrual	183	524
Loans paid down/payoffs	(595)	(183)
Loans return to accrual status	(191)	(132)
Loans charged off	(588)	(3)
Balance	933	2,714
Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	88	193
Transfer into non-accrual	464	624
Loans paid down/payoffs	(90)	(113)
Loans return to accrual status	(71)	(162)
Loans charged off	(256)	(349)
Balance	135	193
Commercial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	48
Transfer into non-accrual		48
Loans paid down/payoffs	(48)
Balance		48
Construction
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	318
Balance		(2)
Transfer into non-accrual		84
Loans paid down/payoffs	(90)	(86)
Balance	228
Commercial Real Estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	507	647
Transfer into non-accrual	2,082	132
Loans paid down/payoffs	(2,057)	(147)
Balance	$ 532	$ 632