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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,867,529	$ 2,782,439	$ 2,736,269
Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	2,468,982	2,374,582
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	341,479	339,876
Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	19,652	22,784
Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	35,718	43,546
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	1,698	1,651
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	907,910	858,369	831,577
Residential Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	895,277	846,394
Residential Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	654	922
Residential Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	11,979	11,053
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,190,052	1,164,023	1,138,756
Commercial Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	1,165,799	1,130,235
Commercial Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	6,235	9,154
Commercial Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	18,018	24,634
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	386,393	373,400	370,701
Commercial | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	369,697	354,904
Commercial | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	12,605	12,517
Commercial | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	4,091	5,979
Home Equity
Financing Receivable, Recorded Investment [Line Items]
Loans	323,671	323,378	327,083
Home Equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	321,993	321,727
Home Equity | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	1,678	1,651
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	19,506	18,149	17,035
Consumer | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	19,486	18,149
Consumer | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	20
HPFC Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Loans	39,997	45,120	$ 51,117
HPFC Portfolio Segment | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	38,209	43,049
HPFC Portfolio Segment | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	158	191
HPFC Portfolio Segment | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,630	$ 1,880

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+ References

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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://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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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