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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,110,634	$ 3,026,222	$ 2,908,843
Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	2,716,510	2,636,966
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	345,141	346,512
Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	20,205	12,619
Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	26,168	28,250
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	2,610	1,875
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,061,898	992,866	941,488
Residential Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	1,053,013	983,086
Residential Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	477	887
Residential Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	8,408	8,893
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,255,519	1,269,533	1,215,979
Commercial Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	1,224,231	1,247,190
Commercial Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	17,047	7,921
Commercial Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	14,241	14,422
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	421,754	381,780	368,837
Commercial | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	416,591	374,429
Commercial | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	2,591	3,688
Commercial | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	2,572	3,663
Home Equity
Financing Receivable, Recorded Investment [Line Items]
Loans	323,564	327,763	325,452
Home Equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	320,961	325,917
Home Equity | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	2,603	1,846
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	24,187	20,624	20,258
Consumer | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	24,180	20,595
Consumer | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	7	29
HPFC Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Loans	23,712	33,656	$ 36,829
HPFC Portfolio Segment | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	22,675	32,261
HPFC Portfolio Segment | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	90	123
HPFC Portfolio Segment | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 947	$ 1,272

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+ References

No definition available.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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