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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 2,748,290 | $ 2,594,564 | $ 2,592,009
Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,335,658 | 2,173,031 |
Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 344,825 | 345,615 |
Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 19,575 | 13,966 |
Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 45,209 | 58,872 |
Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,397 | 1,456 |
Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,626 | 1,624 |
Residential Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 852,851 | 802,494 | 797,036
Residential Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 841,539 | 789,554 |
Residential Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 933 | 2,387 |
Residential Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 10,379 | 10,553 |
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,131,883 | 1,050,780 | 1,054,307
Commercial Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,086,856 | 1,003,386 |
Commercial Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 16,663 | 5,724 |
Commercial Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 28,364 | 41,670 |
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 369,155 | 333,639 | 324,422
Commercial | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 361,343 | 321,148 |
Commercial | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,770 | 5,598 |
Commercial | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 4,645 | 5,437 |
Commercial | Doubtful [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,397 | 1,456 |
Home Equity |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 328,328 | 329,907 | 333,095
Home Equity | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 326,702 | 328,287 |
Home Equity | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,626 | 1,620 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 18,123 | 17,332 | 17,416
Consumer | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 18,123 | 17,328 |
Consumer | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans |  | 4 |
HPFC Portfolio Segment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 47,950 | 60,412 | $ 65,733
HPFC Portfolio Segment | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 45,920 | 58,943 |
HPFC Portfolio Segment | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 209 | 257 |
HPFC Portfolio Segment | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 1,821 | $ 1,212 |

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