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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Schedule of Contractual Amounts (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | $ 430,402 | $ 384,920
Commitments to originate new loans |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 20,431 | 52,438
Unused funds on commercial and other lines of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 169,063 | 134,408
Unadvanced funds on home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 106,121 | 108,745
Unadvanced funds on construction and real estate loans |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 133,130 | 87,915
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 1,171 | 928
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | $ 486 | $ 486

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