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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES - Schedule of Contractual Amounts (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | $ 515,919 | $ 430,402
Commitments to originate new loans |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 112,669 | 20,431
Unused funds on commercial and other lines of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 188,098 | 169,063
Unadvanced funds on home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 114,711 | 106,121
Unadvanced funds on construction and real estate loans |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 97,500 | 133,130
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 2,941 | 1,171
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | $ 0 | $ 486

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