ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Age Analysis Of Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 19,212	$ 24,492
Current	1,610,900	1,451,335
Net loans receivable	1,630,112	1,475,827
Recorded Investment 90 Days and Accruing	0	0
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	7,203	3,170
60-89 days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	594	618
Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	11,415	20,704
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,006	863
Current	123,931	80,846
Net loans receivable	124,937	81,709
Recorded Investment 90 Days and Accruing	0	0
Commercial and Industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	300	491
Commercial and Industrial | 60-89 days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5	0
Commercial and Industrial | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	701	372
Construction
Financing Receivable, Past Due [Line Items]
Total Past Due		582
Current	125,291	141,739
Net loans receivable	125,291	142,321
Recorded Investment 90 Days and Accruing	0	0
Construction | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Construction | 60-89 days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	582
Construction | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	12,037	18,042
Current	983,183	860,407
Net loans receivable	995,220	878,449
Recorded Investment 90 Days and Accruing	0	0
Commercial Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,326	2,282
Commercial Real Estate | 60-89 days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	68	0
Commercial Real Estate | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	5,643	15,760
Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total Past Due	6,153	5,000
Current	376,414	365,955
Net loans receivable	382,567	370,955
Recorded Investment 90 Days and Accruing	0	0
Residential Real Estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	563	393
Residential Real Estate | 60-89 days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	520	35
Residential Real Estate | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	5,070	4,572
Consumer and Other
Financing Receivable, Past Due [Line Items]
Total Past Due	16	5
Current	2,081	2,388
Net loans receivable	2,097	2,393
Recorded Investment 90 Days and Accruing	0	0
Consumer and Other | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	14	4
Consumer and Other | 60-89 days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1	1
Consumer and Other | Greater Than 90 Days
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 1	$ 0