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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2020 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |  |  |
Goodwill, Beginning Balance |  |  | $ 74,135 | $ 65,614
Adjustment, due to Sale |  | $ (2,500) | (2,463) |
Goodwill, Ending Balance |  | 89,984 | 89,984 | 74,135
Fountain Leasing Limited Liability Company [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition of business |  |  | 2,400 |
Progressive Financial Group Inc. [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Adjustment to values initially recorded for acquisitions | $ (231) |  |  |
Acquisition of business |  |  | 323 | $ 8,521
Goodwill, Ending Balance | $ 8,800 | 8,844 | 8,844 |
Sevier County Bancshares Inc [Member] |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Acquisition of business |  |  | 15,589 |
Goodwill, Ending Balance |  | $ 15,589 | $ 15,589 |

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