ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Credit Risk Profile By Creditworthiness (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	$ 1,686,432	$ 1,630,112
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	133,654	124,937
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	114,734	125,291
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,056,745	995,220
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,305,133	1,245,448
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	379,396	382,567
Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,903	2,097
Pass | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	133,281	124,102
Pass | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	110,392	122,689
Pass | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,040,848	982,480
Pass | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,284,520	1,229,271
Special Mention | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	0	0
Special Mention | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	4,342	2,352
Special Mention | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	5,401	5,520
Special Mention | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	9,744	7,872
Substandard | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	373	835
Substandard | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable		250
Substandard | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	10,496	7,220
Substandard | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	10,869	8,305
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	372,741	377,497
Performing | Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,903	2,096
Non-performing | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	6,655	5,070
Non-performing | Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	$ 0	$ 1