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BASIS OF PRESENTATION - Impact of Adoption (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | $ 2,562,885 | $ 2,534,154 |  |  |  |
Total allowance for credit losses on loans | 19,082 | 22,448 | $ 22,815 | $ 17,907 | $ 16,509 | $ 15,353
Decrease to retained earnings | 195,607 | 209,426 |  |  |  |
Tax exempt |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 47,862 | 42,448 |  |  |  |
Total allowance for credit losses on loans | 58 | 85 | 91 | 68 | 64 | 67
Home equity |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 100,096 | 88,002 |  |  |  |
Total allowance for credit losses on loans | 285 | 804 | 822 | 314 | 318 | 320
Total commercial loans | Commercial construction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 117,882 | 152,700 |  |  |  |
Total allowance for credit losses on loans | 824 | 2,086 | 2,372 | 717 | 532 | 317
Total commercial loans | Commercial real estate owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans |  |  |  | 1,894 |  | 2,368
Total commercial loans | Commercial real estate non-owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans |  |  |  | 6,457 | 5,926 | 4,695
Total commercial real estate |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 1,084,381 |  |  |  |  |
Total commercial real estate | Commercial real estate owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 219,217 | 253,792 |  |  |  |
Total allowance for credit losses on loans | 1,783 | 2,719 | 2,552 | 1,894 | 1,524 |
Total commercial real estate | Commercial real estate non-owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 716,776 | 733,353 |  |  |  |
Total allowance for credit losses on loans | 7,864 | 5,582 | 5,604 |  |  |
Total commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 441,069 |  |  |  |  |
Total commercial and industrial | Commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 355,684 | 336,989 |  |  |  |
Total allowance for credit losses on loans | 3,137 | 5,306 | 5,225 | 3,282 | 3,056 | 3,262
Total residential real estate | Residential mortgages |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 995,216 | 917,301 |  |  |  |
Total allowance for credit losses on loans | 5,010 | 5,792 | 6,069 | 5,078 | 4,991 | 4,213
Total consumer | Consumer other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 10,152 | 9,569 |  |  |  |
Total allowance for credit losses on loans | 121 | $ 74 | $ 80 | $ 97 | $ 98 | $ 111
Post-CECL Adoption Portfolio Segmentation |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 2,562,885 |  |  |  |  |
Total allowance for credit losses on loans | 24,310 |  |  |  |  |
Allowance for credit losses on OBS credit exposures | 1,975 |  |  |  |  |
Total allowance for credit losses | 26,285 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Commercial construction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 117,882 |  |  |  |  |
Total allowance for credit losses on loans | 2,020 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Commercial real estate owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 219,217 |  |  |  |  |
Total allowance for credit losses on loans | 2,491 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Commercial real estate non-owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 716,776 |  |  |  |  |
Total allowance for credit losses on loans | 5,856 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Tax exempt |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 47,862 |  |  |  |  |
Total allowance for credit losses on loans | 98 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 355,684 |  |  |  |  |
Total allowance for credit losses on loans | 6,133 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Residential mortgages |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 995,216 |  |  |  |  |
Total allowance for credit losses on loans | 6,742 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Home equity |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 100,096 |  |  |  |  |
Total allowance for credit losses on loans | 888 |  |  |  |  |
Post-CECL Adoption Portfolio Segmentation | Consumer other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 10,152 |  |  |  |  |
Total allowance for credit losses on loans | 82 |  |  |  |  |
Impact of CECL Adoption |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 5,228 |  |  |  |  |
Impact of CECL Adoption | Tax exempt |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 40 |  |  |  |  |
Impact of CECL Adoption | Home equity |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 603 |  |  |  |  |
Impact of CECL Adoption | Total commercial loans | Commercial construction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 1,196 |  |  |  |  |
Impact of CECL Adoption | Total commercial real estate | Commercial real estate owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 708 |  |  |  |  |
Impact of CECL Adoption | Total commercial real estate | Commercial real estate non-owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | (2,008) |  |  |  |  |
Impact of CECL Adoption | Total commercial and industrial | Commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 2,996 |  |  |  |  |
Impact of CECL Adoption | Total residential real estate | Residential mortgages |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 1,732 |  |  |  |  |
Impact of CECL Adoption | Total consumer | Consumer other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | (39) |  |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 2,562,885 |  |  |  |  |
Total allowance for credit losses on loans | 19,082 |  |  |  |  |
Allowance for credit losses on OBS credit exposures | 359 |  |  |  |  |
Total allowance for credit losses | 19,441 |  |  |  |  |
Accounting Standards Update 2016-13 | Commercial construction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 117,882 |  |  |  |  |
Total allowance for credit losses on loans | 824 |  |  |  |  |
Accounting Standards Update 2016-13 | Commercial real estate owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 219,217 |  |  |  |  |
Total allowance for credit losses on loans | 1,783 |  |  |  |  |
Accounting Standards Update 2016-13 | Commercial real estate non-owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 716,776 |  |  |  |  |
Total allowance for credit losses on loans | 7,864 |  |  |  |  |
Accounting Standards Update 2016-13 | Tax exempt |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 47,862 |  |  |  |  |
Total allowance for credit losses on loans | 58 |  |  |  |  |
Accounting Standards Update 2016-13 | Commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 355,684 |  |  |  |  |
Total allowance for credit losses on loans | 3,137 |  |  |  |  |
Accounting Standards Update 2016-13 | Residential mortgages |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 995,216 |  |  |  |  |
Total allowance for credit losses on loans | 5,010 |  |  |  |  |
Accounting Standards Update 2016-13 | Home equity |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 100,096 |  |  |  |  |
Total allowance for credit losses on loans | 285 |  |  |  |  |
Accounting Standards Update 2016-13 | Consumer other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 10,152 |  |  |  |  |
Total allowance for credit losses on loans | 121 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 5,228 |  |  |  |  |
Allowance for credit losses on OBS credit exposures | 1,616 |  |  |  |  |
Total allowance for credit losses | 6,844 |  |  |  |  |
Total increase in Allowance for credit losses | 6,844 |  |  |  |  |
Tax effect | (1,602) |  |  |  |  |
Decrease to retained earnings | 5,242 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial construction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 1,196 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial real estate owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 708 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial real estate non-owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | (2,008) |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Tax exempt |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 40 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 2,996 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Residential mortgages |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 1,732 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Home equity |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | 603 |  |  |  |  |
Accounting Standards Update 2016-13 | Impact of CECL Adoption | Consumer other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total allowance for credit losses on loans | (39) |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 2,562,885 |  |  |  |  |
Total allowance for credit losses on loans | 19,082 |  |  |  |  |
Allowance for credit losses on OBS credit exposures | 359 |  |  |  |  |
Total allowance for credit losses | 19,441 |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported | Commercial construction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 131,123 |  |  |  |  |
Total allowance for credit losses on loans | 1,044 |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported | Commercial real estate |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 953,258 |  |  |  |  |
Total allowance for credit losses on loans | 10,199 |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported | Tax exempt |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 63,431 |  |  |  |  |
Total allowance for credit losses on loans | 80 |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported | Commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 377,638 |  |  |  |  |
Total allowance for credit losses on loans | 3,302 |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported | Residential mortgages |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 923,891 |  |  |  |  |
Total allowance for credit losses on loans | 4,078 |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported | Home equity |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 102,464 |  |  |  |  |
Total allowance for credit losses on loans | 258 |  |  |  |  |
Accounting Standards Update 2016-13 | As Reported | Consumer other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 11,080 |  |  |  |  |
Total allowance for credit losses on loans | 121 |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial construction |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | (13,241) |  |  |  |  |
Total allowance for credit losses on loans | (220) |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial real estate |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | (953,258) |  |  |  |  |
Total allowance for credit losses on loans | (10,199) |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial real estate owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 219,217 |  |  |  |  |
Total allowance for credit losses on loans | 1,783 |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial real estate non-owner occupied |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 716,776 |  |  |  |  |
Total allowance for credit losses on loans | 7,864 |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Tax exempt |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | (15,569) |  |  |  |  |
Total allowance for credit losses on loans | (22) |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Commercial and industrial |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | (21,954) |  |  |  |  |
Total allowance for credit losses on loans | (165) |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Residential mortgages |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | 71,325 |  |  |  |  |
Total allowance for credit losses on loans | 932 |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Home equity |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | (2,368) |  |  |  |  |
Total allowance for credit losses on loans | 27 |  |  |  |  |
Accounting Standards Update 2016-13 | Reclassification to CECL Portfolio Segmentation | Consumer other |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total loans | $ (928) |  |  |  |  |

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