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LOANS - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | $ 44,112 | $ 41,014
Interest income, cash basis method | 420 | 495
Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | 9,226 | 6,417
Interest income, cash basis method | 104 | 107
Commercial Real Estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | 33,470 | 28,101
Interest income, cash basis method | 260 | 288
Commercial Real Estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | 5,224 | 4,402
Interest income, cash basis method | 83 | 83
Commercial Real Estate | Single and multi-family | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 0 | 153
Cash basis interest income recognized, with no related allowance | 0 | 0
Average recorded investment with related allowance | 311 | 181
Cash basis interest income recognized, with related allowance | 2 | 0
Commercial Real Estate | Single and multi-family | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 191 | 721
Cash basis interest income recognized, with no related allowance | 5 | 31
Average recorded investment with related allowance | 769 | 915
Cash basis interest income recognized, with related allowance | 10 | 12
Commercial Real Estate | Other | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 20,272 | 20,756
Cash basis interest income recognized, with no related allowance | 91 | 217
Average recorded investment with related allowance | 12,887 | 7,011
Cash basis interest income recognized, with related allowance | 167 | 71
Commercial Real Estate | Other | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 2,157 | 1,272
Cash basis interest income recognized, with no related allowance | 41 | 21
Average recorded investment with related allowance | 2,107 | 1,494
Cash basis interest income recognized, with related allowance | 27 | 19
Commercial and industrial loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 2,625 | 1,350
Cash basis interest income recognized, with no related allowance | 62 | 5
Average recorded investment with related allowance | 3,933 | 5,876
Cash basis interest income recognized, with related allowance | 64 | 143
Average recorded investment | 6,558 | 7,226
Interest income, cash basis method | 126 | 148
Commercial and industrial loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 425 | 403
Cash basis interest income recognized, with no related allowance | 9 | 0
Average recorded investment with related allowance | 61 | 362
Cash basis interest income recognized, with related allowance | 2 | 13
Average recorded investment | 486 | 765
Interest income, cash basis method | 11 | 13
Residential Mortgages | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | 2,291 | 2,964
Interest income, cash basis method | 31 | 32
Residential Mortgages | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | 2,220 | 507
Interest income, cash basis method | 5 | 7
Residential Mortgages | 1-4 Family | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 807 | 2,025
Cash basis interest income recognized, with no related allowance | 14 | 18
Average recorded investment with related allowance | 1,484 | 939
Cash basis interest income recognized, with related allowance | 17 | 14
Residential Mortgages | 1-4 Family | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 700 | 409
Cash basis interest income recognized, with no related allowance | 4 | 6
Average recorded investment with related allowance | 1,520 | 98
Cash basis interest income recognized, with related allowance | 1 | 1
Consumer Loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | 1,793 | 2,723
Interest income, cash basis method | 3 | 27
Consumer Loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment | 1,296 | 743
Interest income, cash basis method | 5 | 4
Consumer Loans | Other | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 0 | 0
Cash basis interest income recognized, with no related allowance | 0 | 0
Average recorded investment with related allowance | 17 | 0
Cash basis interest income recognized, with related allowance | 0 | 0
Consumer Loans | Other | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 19 | 0
Cash basis interest income recognized, with no related allowance | 1 | 0
Average recorded investment with related allowance | 0 | 0
Cash basis interest income recognized, with related allowance | 0 | 0
Consumer Loans | Home equity | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 1,730 | 1,574
Cash basis interest income recognized, with no related allowance | 2 | 19
Average recorded investment with related allowance | 46 | 1,149
Cash basis interest income recognized, with related allowance | 1 | 8
Consumer Loans | Home equity | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average recorded investment, with no related allowance | 953 | 0
Cash basis interest income recognized, with no related allowance | 0 | 0
Average recorded investment with related allowance | 324 | 743
Cash basis interest income recognized, with related allowance | $ 4 | $ 4

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