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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