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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 2,908,843 | $ 2,782,439 | $ 2,748,290
Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,512,366 | 2,374,582 |
Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 344,051 | 339,876 |
Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 16,937 | 22,784 |
Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 33,830 | 43,546 |
Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,659 | 1,651 |
Residential Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 941,488 | 858,369 | 852,851
Residential Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 930,134 | 846,394 |
Residential Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 897 | 922 |
Residential Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 10,457 | 11,053 |
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,215,979 | 1,164,023 | 1,131,883
Commercial Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,185,948 | 1,130,235 |
Commercial Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 13,099 | 9,154 |
Commercial Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 16,932 | 24,634 |
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 368,837 | 373,400 | 369,155
Commercial | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 360,959 | 354,904 |
Commercial | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,802 | 12,517 |
Commercial | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 5,076 | 5,979 |
Home Equity |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 325,452 | 323,378 | 328,328
Home Equity | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 323,840 | 321,727 |
Home Equity | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,612 | 1,651 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 20,258 | 18,149 | 18,123
Consumer | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 20,211 | 18,149 |
Consumer | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 47 |  |
HPFC Portfolio Segment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 36,829 | 45,120 | $ 47,950
HPFC Portfolio Segment | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 35,325 | 43,049 |
HPFC Portfolio Segment | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 139 | 191 |
HPFC Portfolio Segment | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 1,365 | $ 1,880 |

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