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OTHER COMMITMENTS, CONTINGENCIES, AND OFF-BALANCE SHEET ACTIVITIES (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Loss Contingencies by Contingency | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019
Commitments to originate new loans | ​ | $ | 71,857 | ​ | $ | 112,669
Unused funds on commercial and other lines of credit |  | ​ | 202,217 |  | ​ | 188,098
Unadvanced funds on home equity lines of credit | ​ | ​ | 117,198 | ​ | ​ | 114,711
Unadvanced funds on construction and real estate loans | ​ |  | 106,935 | ​ |  | 97,500
Commercial and standby letters of credit | ​ | ​ | 3,481 | ​ | ​ | 2,941
Letters of credit securing municipal deposits | ​ | ​ | 181,150 | ​ | ​ | 38,390
Total | ​ | $ | 682,838 | ​ | $ | 554,309

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