ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY OF FINANCING RECEIVABLES - Allowances Of Loan Losses And Loans Receivable By Class Disaggregated (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	$ 9,190	$ 8,775	$ 7,828	$ 7,335
Balance Loans Individually Evaluated for Impairment	748	515
Balance Related to Loans Collectively Evaluated for Impairment	7,930	7,720
Total Financing Receivables	1,514,752	1,475,827
Individually Evaluated for Impairment	21,673	20,704
Collectively Evaluated for Impairment	1,493,079	1,455,123
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	647	603	389	208
Balance Loans Individually Evaluated for Impairment	104	152
Balance Related to Loans Collectively Evaluated for Impairment	543	451
Total Financing Receivables	93,567	81,709
Individually Evaluated for Impairment	456	372
Collectively Evaluated for Impairment	93,111	81,337
Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	359	663	345	336
Balance Loans Individually Evaluated for Impairment	0	0
Balance Related to Loans Collectively Evaluated for Impairment	359	663
Total Financing Receivables	120,340	142,321
Individually Evaluated for Impairment	0	0
Collectively Evaluated for Impairment	120,340	142,321
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	6,304	5,575	5,801	5,185
Balance Loans Individually Evaluated for Impairment	445	274
Balance Related to Loans Collectively Evaluated for Impairment	5,859	5,301
Total Financing Receivables	929,091	878,449
Individually Evaluated for Impairment	16,666	15,760
Collectively Evaluated for Impairment	912,425	862,689
Residential Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	1,349	1,371	972	1,032
Balance Loans Individually Evaluated for Impairment	199	89
Balance Related to Loans Collectively Evaluated for Impairment	1,150	1,282
Total Financing Receivables	369,100	370,955
Individually Evaluated for Impairment	4,551	4,572
Collectively Evaluated for Impairment	364,549	366,383
Consumer and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	19	23	31	26
Balance Loans Individually Evaluated for Impairment	0	0
Balance Related to Loans Collectively Evaluated for Impairment	19	23
Total Financing Receivables	2,654	2,393
Individually Evaluated for Impairment	0	0
Collectively Evaluated for Impairment	2,654	2,393
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses	512	540	$ 290	$ 548
Total Financing Receivables	$ 0	$ 0

A valuation allowance for financing receivables that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

No definition available.

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The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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