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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Allowances Of Loan Losses And Loans Receivable By Class Disaggregated (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses	$ 9,627	$ 9,190	$ 8,775	$ 8,264	$ 7,828	$ 7,335
Balance Loans Individually Evaluated for Impairment	613		515
Balance Related to Loans Collectively Evaluated for Impairment	8,230		7,720
Net loans receivable	1,531,723		1,475,827
Individually Evaluated for Impairment	18,748		20,704
Collectively Evaluated for Impairment	1,512,975		1,455,123
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses	741	647	603	440	389	208
Balance Loans Individually Evaluated for Impairment	104		152
Balance Related to Loans Collectively Evaluated for Impairment	637		451
Net loans receivable	100,135		81,709
Individually Evaluated for Impairment	453		372
Collectively Evaluated for Impairment	99,682		81,337
Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses	373	359	663	402	345	336
Balance Loans Individually Evaluated for Impairment	0		0
Balance Related to Loans Collectively Evaluated for Impairment	373		663
Net loans receivable	112,020		142,321
Individually Evaluated for Impairment	0		0
Collectively Evaluated for Impairment	112,020		142,321
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses	6,268	6,304	5,575	5,489	5,801	5,185
Balance Loans Individually Evaluated for Impairment	486		274
Balance Related to Loans Collectively Evaluated for Impairment	5,782		5,301
Net loans receivable	940,287		878,449
Individually Evaluated for Impairment	12,718		15,760
Collectively Evaluated for Impairment	927,569		862,689
Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses	1,444	1,349	1,371	1,138	972	1,032
Balance Loans Individually Evaluated for Impairment	23		89
Balance Related to Loans Collectively Evaluated for Impairment	1,421		1,282
Net loans receivable	376,595		370,955
Individually Evaluated for Impairment	5,577		4,572
Collectively Evaluated for Impairment	371,018		366,383
Consumer and Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses	17	19	23	27	31	26
Balance Loans Individually Evaluated for Impairment	0		0
Balance Related to Loans Collectively Evaluated for Impairment	17		23
Net loans receivable	2,686		2,393
Individually Evaluated for Impairment	0		0
Collectively Evaluated for Impairment	2,686		2,393
Unallocated
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses	784	$ 512	540	$ 768	$ 290	$ 548
Net loans receivable	$ 0		$ 0