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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,736,269	$ 2,594,564	$ 2,585,300
Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	2,304,596	2,173,031
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	342,746	345,615
Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	26,753	13,966
Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	59,385	58,872
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,417	1,456
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	1,372	1,624
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	831,577	802,494	800,556
Residential Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	820,437	789,554
Residential Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	942	2,387
Residential Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	10,198	10,553
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,138,756	1,050,780	1,017,777
Commercial Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	1,072,685	1,003,386
Commercial Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	23,866	5,724
Commercial Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	42,205	41,670
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	370,701	333,639	336,517
Commercial | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	362,660	321,148
Commercial | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	1,716	5,598
Commercial | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	4,908	5,437
Commercial | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,417	1,456
Home Equity
Financing Receivable, Recorded Investment [Line Items]
Loans	327,083	329,907	341,981
Home Equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	325,711	328,287
Home Equity | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	1,372	1,620
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	17,035	17,332	17,818
Consumer | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	17,035	17,328
Consumer | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans		4
HPFC Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Loans	51,117	60,412	$ 70,651
HPFC Portfolio Segment | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	48,814	58,943
HPFC Portfolio Segment | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	229	257
HPFC Portfolio Segment | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,074	$ 1,212

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- Definition

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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://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=65884687&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=66008989&loc=d3e5074-111524

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