ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Credit Risk Profile By Creditworthiness (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 1,514,752	$ 1,475,827
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	93,567	81,709
Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	120,340	142,321
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	929,091	878,449
Total
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,142,998	1,102,479
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	369,100	370,955
Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	2,654	2,393
Pass | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	92,910	80,977
Pass | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	118,666	141,871
Pass | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	905,959	855,180
Pass | Total
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,117,535	1,078,028
Special Mention | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	21	32
Special Mention | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,224	0
Special Mention | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	5,855	3,908
Special Mention | Total
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	7,100	3,940
Substandard | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	636	700
Substandard | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	450	450
Substandard | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	17,277	19,361
Substandard | Total
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	18,363	20,511
Doubtful | Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	0	0
Doubtful | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	0	0
Doubtful | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	0	0
Doubtful | Total
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	0	0
Performing | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	365,023	366,383
Performing | Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	2,654	2,393
Non-performing | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	4,077	4,572
Non-performing | Consumer and Other
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 0	$ 0