ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Recorded Investment
Total	$ 14,263	$ 20,704
Unpaid Principal Balance
Total	13,847	21,883
Related Allowance	716	515
Average Recorded Investment
Total	17,597	15,081
Interest Income Recognized
Total	298	154
Commercial and Industrial
Recorded Investment
With no related allowance recorded	345	0
With an allowance recorded	490	372
Total	835	372
Unpaid Principal Balance
With no related allowance recorded	495	10
With an allowance recorded	491	572
Total	986	582
Related Allowance	353	152
Average Recorded Investment
With no related allowance recorded	184	4
With an allowance recorded	406	195
Total	590	199
Interest Income Recognized
With no related allowance recorded	8	0
With an allowance recorded	7	0
Total	15	0
Construction
Recorded Investment
With no related allowance recorded	250	0
Total	250	0
Unpaid Principal Balance
With no related allowance recorded	250	0
Total	250	0
Related Allowance	0
Average Recorded Investment
With no related allowance recorded	250	21
Total	250	21
Interest Income Recognized
With no related allowance recorded	0	0
Total	0	0
Commercial Real Estate
Recorded Investment
With no related allowance recorded	6,632	13,745
With an allowance recorded	544	2,015
Total	7,176	15,760
Unpaid Principal Balance
With no related allowance recorded	5,790	13,745
With an allowance recorded	498	2,437
Total	6,288	16,182
Related Allowance	296	274
Average Recorded Investment
With no related allowance recorded	10,474	9,774
With an allowance recorded	947	1,291
Total	11,421	11,065
Interest Income Recognized
With no related allowance recorded	170	102
With an allowance recorded	10	4
Total	180	106
Residential Real Estate
Recorded Investment
With no related allowance recorded	5,450	2,790
With an allowance recorded	552	1,782
Total	6,002	4,572
Unpaid Principal Balance
With no related allowance recorded	5,775	2,790
With an allowance recorded	548	2,329
Total	6,323	5,119
Related Allowance	67	89
Average Recorded Investment
With no related allowance recorded	4,831	3,082
With an allowance recorded	505	714
Total	5,336	3,796
Interest Income Recognized
With no related allowance recorded	100	48
With an allowance recorded	3	0
Total	103	48
Consumer and Other
Recorded Investment
With an allowance recorded	0	0
Total	0	0
Unpaid Principal Balance
With an allowance recorded	0	0
Total	0	0
Related Allowance	0	0
Average Recorded Investment
With an allowance recorded	0	0
Total	0	0
Interest Income Recognized
With an allowance recorded	0	0
Total	$ 0	$ 0