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Business Combinations (Pro Forma Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Sevier County Bancshares Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual | $ 1,090 |  | $ 1,090 |
Pro forma revenue | 39,207 | $ 32,965 | 110,745 | $ 93,213
Pro forma information, earnings (loss) since acquisition date, actual | 343 |  | 343 |
Pro forma net income (loss) | 10,516 | 6,624 | 30,984 | 16,473
Fountain [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual | 1,696 |  | 2,834 |
Pro forma revenue | 36,690 | 31,566 | 102,470 | 89,016
Pro forma information, earnings (loss) since acquisition date, actual | 357 |  | 702 |
Pro forma net income (loss) | $ 9,614 | $ 6,744 | $ 28,101 | $ 16,274

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