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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | $ 682,838 | $ 554,309
Commitments to originate new loans |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 71,857 | 112,669
Unused funds on commercial and other lines of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 202,217 | 188,098
Unadvanced funds on home equity lines of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 117,198 | 114,711
Unadvanced funds on construction and real estate loans |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 106,935 | 97,500
Commercial and standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | 3,481 | 2,941
Letters of credit securing municipal deposits |  |
Loss Contingencies [Line Items] |  |
Contractual amounts of commitments and contingent liabilities | $ 181,150 | $ 38,390

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