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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans (Details) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan | Jun. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 2,534,154 | $ 2,562,885 |  |  |  |
Allowance for credit losses | 22,448 | 19,082 | $ 22,815 | $ 17,907 | $ 16,509 | $ 15,353
Net loans | 2,511,706 | 2,543,803 |  |  |  |
Accrued interest receivable for loans | 8,700 | 11,400 |  |  |  |
Tax exempt |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 42,448 | 47,862 |  |  |  |
Allowance for credit losses | 85 | 58 | 91 | 68 | 64 | 67
Net loans | 42,448 |  |  |  |  |
Home equity |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 88,002 | 100,096 |  |  |  |
Allowance for credit losses | $ 804 | $ 285 | 822 | 314 | 318 | 320
Paycheck Protection Program [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of loans outstanding | loan | 404 | 746 |  |  |  |
Outstanding principal balance | $ 24,200 | $ 53,800 |  |  |  |
Total commercial loans | Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 152,700 | 117,882 |  |  |  |
Allowance for credit losses | 2,086 | 824 | 2,372 | 717 | 532 | 317
Net loans | 152,700 |  |  |  |  |
Total commercial loans | Commercial real estate owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses |  |  |  | 1,894 |  | 2,368
Total commercial loans | Commercial real estate non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses |  |  |  | 6,457 | 5,926 | 4,695
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 | 253,792 | 219,217 |  |  |  |
Allowance for credit losses | 2,719 | 1,783 | 2,552 | 1,894 | 1,524 |
Net loans | 253,792 |  |  |  |  |
Total commercial real estate | Commercial real estate non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 733,353 | 716,776 |  |  |  |
Allowance for credit losses | 5,582 | 7,864 | 5,604 |  |  |
Net loans | 733,353 |  |  |  |  |
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 | 336,989 | 355,684 |  |  |  |
Allowance for credit losses | 5,306 | 3,137 | 5,225 | 3,282 | 3,056 | 3,262
Net loans | 336,989 |  |  |  |  |
Total residential real estate | Residential mortgages |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 917,301 | 995,216 |  |  |  |
Allowance for credit losses | 5,792 | 5,010 | 6,069 | 5,078 | 4,991 | 4,213
Total consumer | Consumer other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 9,569 | 10,152 |  |  |  |
Allowance for credit losses | $ 74 | $ 121 | $ 80 | $ 97 | $ 98 | $ 111

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