LOANS AND ALLOWANCE FOR LOAN LOSSES (Schedule of Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,585,300	$ 2,490,206	$ 1,807,007
Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	2,134,217	2,023,263
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	358,184	364,536
Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	29,457	34,720
Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	61,827	65,636
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	1,615	2,051
Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	800,556	820,617	587,244
Residential Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	785,673	802,873
Residential Real Estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Residential Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	3,025	3,282
Residential Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	11,858	14,462
Residential Real Estate | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans	1,017,777	927,951	660,135
Commercial Real Estate | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	957,457	868,664
Commercial Real Estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial Real Estate | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	18,087	20,732
Commercial Real Estate | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	42,233	38,555
Commercial Real Estate | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans	336,517	297,721	262,187
Commercial | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	322,590	281,553
Commercial | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	8,043	7,527
Commercial | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	5,884	8,641
Commercial | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Home Equity
Financing Receivable, Recorded Investment [Line Items]
Loans	341,981	348,634	281,057
Home Equity | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Home Equity | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	340,370	346,701
Home Equity | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Home Equity | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Home Equity | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	1,611	1,933
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	17,818	17,953	16,384
Consumer | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	17,814	17,835
Consumer | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	4	118
HPFC Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	70,651	77,330	$ 0
HPFC Portfolio Segment [Member] | Pass (Grades 1-6)
Financing Receivable, Recorded Investment [Line Items]
Loans	68,497	70,173
HPFC Portfolio Segment [Member] | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
HPFC Portfolio Segment [Member] | Special Mention (Grade 7)
Financing Receivable, Recorded Investment [Line Items]
Loans	302	3,179
HPFC Portfolio Segment [Member] | Substandard (Grade 8)
Financing Receivable, Recorded Investment [Line Items]
Loans	1,852	3,978
HPFC Portfolio Segment [Member] | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 0	$ 0