LOANS, TROUBLED DEBT RESTRUCTURING (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) Loan	Dec. 31, 2016 USD ($) Loan	Dec. 31, 2015 USD ($) Loan
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans (in loan) | Loan	2	13	10
Pre-Modification Recorded Balance	$ 32,000	$ 2,320,000	$ 301,000
Post-Modification Recorded Balance	23,000	2,393,000	304,000
Loans modified that subsequently defaulted	1,236,000	0	0
Modified impaired loans without a valuation allowance	21,000	881,000
Modified impaired loans with valuation allowance	0	1,168,000
Federal Home Loan Mortgage Corporation and Other Investors
Loan modifications classified as troubled debt restructurings [Abstract]
Unpaid principal balances of loans sold and serviced for the Federal Home Loan Mortgage Corporation	$ 92,818,000	$ 100,982,000	$ 111,837,000
Commercial & industrial
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans (in loan) | Loan	0	0	0
Pre-Modification Recorded Balance	$ 0	$ 0	$ 0
Post-Modification Recorded Balance	$ 0	$ 0	$ 0
Commercial, secured by real estate
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans (in loan) | Loan	0	4	1
Pre-Modification Recorded Balance	$ 0	$ 2,142,000	$ 75,000
Post-Modification Recorded Balance	$ 0	$ 2,215,000	$ 74,000
Residential real estate
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans (in loan) | Loan	1	6	7
Pre-Modification Recorded Balance	$ 18,000	$ 139,000	$ 217,000
Post-Modification Recorded Balance	$ 9,000	$ 139,000	$ 221,000
Consumer
Loan modifications classified as troubled debt restructurings [Abstract]
Number of Loans (in loan) | Loan	1	3	2
Pre-Modification Recorded Balance	$ 14,000	$ 39,000	$ 9,000
Post-Modification Recorded Balance	$ 14,000	$ 39,000	$ 9,000