ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Credit Risk Profile By Creditworthiness (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	$ 1,531,723	$ 1,475,827
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	100,135	81,709
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	112,020	142,321
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	940,287	878,449
Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,152,442	1,102,479
Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	376,595	370,955
Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	2,686	2,393
Pass | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	99,507	80,977
Pass | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	111,570	141,871
Pass | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	922,571	855,180
Pass | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	1,133,648	1,078,028
Special Mention | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	11	32
Special Mention | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	0	0
Special Mention | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	4,998	3,908
Special Mention | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	5,009	3,940
Substandard | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	617	700
Substandard | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	450	450
Substandard | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	12,718	19,361
Substandard | Total
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	13,785	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	372,187	366,383
Performing | Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	2,686	2,393
Non-performing | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	4,408	4,572
Non-performing | Consumer and Other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans receivable	$ 0	$ 0