FAIR VALUE - NON-RECURRING LEVEL 3 MEASUREMENTS (Details) - Fair Value, Inputs, Level 3 - Nonrecurring basis - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Premises | Sale comparison approach
Fair value inputs quantitative information
Fair Value	$ 2,896	$ 3,017
Premises | Sale comparison approach | Minimum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	8.00%	4.00%
Premises | Sale comparison approach | Maximum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	68.00%	67.00%
Premises | Sale comparison approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	24.00%	21.00%
Impaired Loans | Commercial Real Estate | Sale comparison approach
Fair value inputs quantitative information
Fair Value	$ 79	$ 79
Adjustments determined by management for differences (as a percent)	21.00%	21.00%
Impaired Loans | Commercial Real Estate | Sale comparison approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	21.00%	21.00%
Impaired Loans | Commercial Real Estate | Income approach
Fair value inputs quantitative information
Fair Value	$ 1,263	$ 1,287
Adjustments determined by management for differences (as a percent)	17.00%	17.00%
Impaired Loans | Commercial Real Estate | Income approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	17.00%	17.00%
Impaired Loans | Residential Real Estate - Owner Occupied | Sale comparison approach
Fair value inputs quantitative information
Fair Value	$ 3,269	$ 4,107
Impaired Loans | Residential Real Estate - Owner Occupied | Sale comparison approach | Minimum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	0.00%	0.00%
Impaired Loans | Residential Real Estate - Owner Occupied | Sale comparison approach | Maximum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	54.00%	54.00%
Impaired Loans | Residential Real Estate - Owner Occupied | Sale comparison approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	12.00%	10.00%
Impaired Loans | Residential Real Estate - Non Owner Occupied | Sale comparison approach
Fair value inputs quantitative information
Fair Value	$ 1,339	$ 237
Impaired Loans | Residential Real Estate - Non Owner Occupied | Sale comparison approach | Minimum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	0.00%	0.00%
Impaired Loans | Residential Real Estate - Non Owner Occupied | Sale comparison approach | Maximum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	27.00%	8.00%
Impaired Loans | Residential Real Estate - Non Owner Occupied | Sale comparison approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	13.00%	5.00%
Impaired Loans | Home equity lines of credit | Sale comparison approach
Fair value inputs quantitative information
Fair Value	$ 308	$ 393
Impaired Loans | Home equity lines of credit | Sale comparison approach | Minimum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	0.00%	0.00%
Impaired Loans | Home equity lines of credit | Sale comparison approach | Maximum
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	22.00%	23.00%
Impaired Loans | Home equity lines of credit | Sale comparison approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	14.00%	15.00%
Impaired Loans | Commercial & industrial | Sale comparison approach
Fair value inputs quantitative information
Fair Value	$ 744
Adjustments determined by management for differences (as a percent)	3.00%
Impaired Loans | Commercial & industrial | Sale comparison approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)	3.00%
Other Real Estate Owned | Residential Real Estate | Sale comparison approach
Fair value inputs quantitative information
Fair Value		$ 83
Adjustments determined by management for differences (as a percent)		86.00%
Other Real Estate Owned | Residential Real Estate | Sale comparison approach | Weighted Average
Fair value inputs quantitative information
Adjustments determined by management for differences (as a percent)		86.00%