ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Recorded Investment
Total	$ 13,181		$ 14,263
Unpaid Principal Balance
Total	14,689		13,847
Related Allowance	371		716
Average Recorded Investment
With no related allowance recorded	12,345	$ 19,348
With an allowance recorded	1,285	2,043
Total	13,630	21,391
Interest Income Recognized
With no related allowance recorded	27	142
With an allowance recorded	0	10
Total	27	152
Commercial and Industrial
Recorded Investment
With no related allowance recorded	160		345
With an allowance recorded	149		490
Total	309		835
Unpaid Principal Balance
With no related allowance recorded	160		495
With an allowance recorded	491		491
Total	652		986
Related Allowance	10		353
Average Recorded Investment
With no related allowance recorded	251	79
With an allowance recorded	320	335
Interest Income Recognized
With no related allowance recorded	2	0
With an allowance recorded	0	5
Construction
Recorded Investment
With no related allowance recorded			250
Total			250
Unpaid Principal Balance
With no related allowance recorded			250
Total			250
Related Allowance	0
Average Recorded Investment
With no related allowance recorded	0	0
Interest Income Recognized
With no related allowance recorded	0	0
Commercial Real Estate
Recorded Investment
With no related allowance recorded	7,429		6,632
With an allowance recorded	484		544
Total	7,913		7,176
Unpaid Principal Balance
With no related allowance recorded	7,905		5,790
With an allowance recorded	586		498
Total	8,491		6,288
Related Allowance	291		296
Average Recorded Investment
With no related allowance recorded	6,536	15,469
With an allowance recorded	486	936
Interest Income Recognized
With no related allowance recorded	9	124
With an allowance recorded	0	5
Residential Real Estate
Recorded Investment
With no related allowance recorded	4,554		5,450
With an allowance recorded	405		552
Total	4,959		6,002
Unpaid Principal Balance
With no related allowance recorded	5,142		5,775
With an allowance recorded	405		548
Total	5,547		6,323
Related Allowance	70		$ 67
Average Recorded Investment
With no related allowance recorded	5,558	3,800
With an allowance recorded	479	772
Interest Income Recognized
With no related allowance recorded	16	18
With an allowance recorded	$ 0	$ 0