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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | $ 2,551,064 | $ 2,562,885 |  |
Allowance for credit losses | 23,653 | 19,082 | $ 15,297 | $ 15,353
Net loans | 2,527,411 | 2,543,803 |  |
Accrued interest receivable for loans | 11,900 | 11,400 |  |
Tax exempt |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 46,541 | 47,862 |  |
Allowance for credit losses | 94 | 58 | 57 | 67
Net loans | 46,541 |  |  |
Home equity |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 93,625 | 100,096 |  |
Allowance for credit losses | $ 823 | $ 285 | 328 | 320
Paycheck Protection Program [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans outstanding | loan | 1,057 | 746 |  |
Outstanding principal balance | $ 77,900 | $ 53,800 |  |
Paycheck Protection Program, Round 2021 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loans outstanding | loan | 956 |  |  |
Outstanding principal balance |  | 57,400 |  |
Total commercial loans | Commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | $ 117,464 | 117,882 |  |
Allowance for credit losses | 1,792 | 824 | 395 | 317
Net loans | 117,464 |  |  |
Total commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans |  | 1,084,381 |  |
Total commercial real estate | Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 233,847 | 219,217 |  |
Allowance for credit losses | 3,352 | 1,783 | 1,486 | 2,368
Net loans | 233,847 |  |  |
Total commercial real estate | Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 733,507 | 716,776 |  |
Allowance for credit losses | 5,902 | 7,864 | 5,314 | 4,695
Net loans | 733,507 |  |  |
Total commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans |  | 441,069 |  |
Total commercial and industrial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 376,395 | 355,684 |  |
Allowance for credit losses | 5,040 | 3,137 | 3,323 | 3,262
Net loans | 376,395 |  |  |
Total residential real estate | Residential mortgages |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 940,127 | 995,216 |  |
Allowance for credit losses | 6,569 | 5,010 | 4,291 | 4,213
Total consumer | Consumer other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans | 9,558 | 10,152 |  |
Allowance for credit losses | $ 81 | $ 121 | $ 103 | $ 111

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