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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 3,110,634 | $ 3,026,222 | $ 2,908,843
Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,716,510 | 2,636,966 |
Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 345,141 | 346,512 |
Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 20,205 | 12,619 |
Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 26,168 | 28,250 |
Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,610 | 1,875 |
Residential Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,061,898 | 992,866 | 941,488
Residential Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,053,013 | 983,086 |
Residential Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 477 | 887 |
Residential Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 8,408 | 8,893 |
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,255,519 | 1,269,533 | 1,215,979
Commercial Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,224,231 | 1,247,190 |
Commercial Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 17,047 | 7,921 |
Commercial Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 14,241 | 14,422 |
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 421,754 | 381,780 | 368,837
Commercial | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 416,591 | 374,429 |
Commercial | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,591 | 3,688 |
Commercial | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,572 | 3,663 |
Home Equity |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 323,564 | 327,763 | 325,452
Home Equity | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 320,961 | 325,917 |
Home Equity | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,603 | 1,846 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 24,187 | 20,624 | 20,258
Consumer | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 24,180 | 20,595 |
Consumer | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 7 | 29 |
HPFC Portfolio Segment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 23,712 | 33,656 | $ 36,829
HPFC Portfolio Segment | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 22,675 | 32,261 |
HPFC Portfolio Segment | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 90 | 123 |
HPFC Portfolio Segment | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 947 | $ 1,272 |

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