FAIR VALUES - Quantitative Information (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Recurring | Derivative liabilities
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liabilities, fair value, recurring	$ 75	$ 68
Recurring | Corporate bonds and notes
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, recurring		250
Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring	507	2,850
Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring	$ 1,940	$ 344
Minimum | Recurring | Derivative liabilities
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate	5.67%	4.92%
Minimum | Recurring | Corporate bonds and notes
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate		1.73%
Maximum | Recurring | Derivative liabilities
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate	5.67%	4.92%
Maximum | Recurring | Corporate bonds and notes
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate		1.73%
Weighted Average | Recurring | Derivative liabilities
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate	5.67%	4.92%
Weighted Average | Recurring | Corporate bonds and notes
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Discount rate		1.73%
Residential Mortgage | Minimum | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	20.80%	17.28%
Residential Mortgage | Maximum | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	48.17%	27.97%
Residential Mortgage | Weighted Average | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	30.50%	20.77%
Sales Comparison | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring	$ 382	$ 344
Sales Comparison | Commercial and Industrial | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring	96
Sales Comparison | Commercial and Industrial | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring	$ 1,483
Sales Comparison | Commercial and Industrial | Minimum | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	0.00%
Sales Comparison | Commercial and Industrial | Minimum | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	10.00%
Sales Comparison | Commercial and Industrial | Maximum | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	36.07%
Sales Comparison | Commercial and Industrial | Maximum | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	22.95%
Sales Comparison | Commercial and Industrial | Weighted Average | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	33.02%
Sales Comparison | Commercial and Industrial | Weighted Average | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	19.75%
Sales Comparison | Commercial mortgages | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring	$ 411
Sales Comparison | Commercial mortgages | Minimum | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	10.00%	9.00%
Sales Comparison | Commercial mortgages | Maximum | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	89.98%	10.00%
Sales Comparison | Commercial mortgages | Weighted Average | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	51.35%	9.52%
Sales Comparison | Home equity lines and loans | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring		$ 219
Sales Comparison | Home equity lines and loans | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring	$ 75
Sales Comparison | Home equity lines and loans | Minimum | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value		22.98%
Sales Comparison | Home equity lines and loans | Minimum | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	20.80%
Sales Comparison | Home equity lines and loans | Maximum | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value		22.98%
Sales Comparison | Home equity lines and loans | Maximum | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	20.80%
Sales Comparison | Home equity lines and loans | Weighted Average | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value		22.98%
Sales Comparison | Home equity lines and loans | Weighted Average | Non-recurring | OREO
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, discount to appraised value	20.80%
Income Approach Valuation Technique | Commercial mortgages | Non-recurring | Impaired Loans
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Assets, fair value, nonrecurring		$ 2,631