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LOANS AND ALLOWANCE FOR LOAN LOSSES (Credit Risk Exposure Indicators by Portfolio Segment) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 3,042,442 | $ 3,026,222 | $ 2,789,148
Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,659,869 | 2,636,966 |
Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 342,215 | 346,512 |
Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 8,248 | 12,619 |
Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 29,623 | 28,250 |
Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,487 | 1,875 |
Residential Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,017,442 | 992,866 | 860,533
Residential Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,007,775 | 983,086 |
Residential Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 878 | 887 |
Residential Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 8,789 | 8,893 |
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,258,474 | 1,269,533 | 1,169,533
Commercial Real Estate | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,237,494 | 1,247,190 |
Commercial Real Estate | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 5,114 | 7,921 |
Commercial Real Estate | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 15,866 | 14,422 |
Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 390,982 | 381,780 | 378,015
Commercial | Pass (Grades 1-6) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 385,081 | 374,429 |
Commercial | Special Mention (Grade 7) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,146 | 3,688 |
Commercial | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 3,755 | 3,663 |
Home Equity |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 323,969 | 327,763 | 320,642
Home Equity | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 321,505 | 325,917 |
Home Equity | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,464 | 1,846 |
Consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 20,733 | 20,624 | 18,011
Consumer | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 20,710 | 20,595 |
Consumer | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 23 | 29 |
HPFC Portfolio Segment |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 30,842 | 33,656 | $ 42,414
HPFC Portfolio Segment | Performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 29,519 | 32,261 |
HPFC Portfolio Segment | Substandard (Grade 8) |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 110 | 123 |
HPFC Portfolio Segment | Non-performing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 1,213 | $ 1,272 |

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