ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Credit Risk Profile By Creditworthiness (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	$ 1,630,112	$ 1,475,827
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	124,937	81,709
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	125,291	142,321
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	995,220	878,449
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,245,448	1,102,479
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	382,567	370,955
Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	2,097	2,393
Pass | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	124,102	80,977
Pass | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	122,689	141,871
Pass | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	982,480	855,180
Pass | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,229,271	1,078,028
Special Mention | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	0	32
Special Mention | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	2,352	0
Special Mention | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	5,520	3,908
Special Mention | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	7,872	3,940
Substandard | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	835	700
Substandard | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	250	450
Substandard | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	7,220	19,361
Substandard | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	8,305	20,511
Doubtful | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	0	0
Doubtful | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	0	0
Doubtful | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	0	0
Doubtful | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	0	0
Performing | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	377,497	366,408
Performing | Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	2,096	2,393
Non-performing | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	5,070	4,547
Non-performing | Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	$ 1	$ 0