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Business Combinations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 | May 03, 2021 | Mar. 01, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 1.00 |  |  | $ 1 |  | $ 1 |  | $ 1 |
Goodwill |  |  |  | $ 89,984 |  | $ 89,984 |  | $ 74,135 | $ 65,614
Merger-related costs |  |  |  | 464 | $ 290 | 939 | $ 3,863 |  |
Sevier County Bancshares Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | 0 |  |  |  |  |  |  |  |
Sevier County Bancshares Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash to be paid upon conversion (in dollars per share) | $ 10.17 |  |  |  |  |  |  |  |
Common shares to be converted (in shares) | 0.4116 |  |  |  |  |  |  |  |
Number of shares issued (in shares) | 1,691,535 |  |  |  |  |  |  |  |
Cash consideration paid | $ 9,600 |  |  |  |  | 9,568 |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  | 1,090 |  | 1,090 |  |  |
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  | 343 |  | 343 |  |  |
Pro forma revenue |  |  |  | 39,207 | 32,965 | 110,745 | 93,213 |  |
Pro forma net income (loss) |  |  |  | 10,516 | 6,624 | 30,984 | 16,473 |  |
Assets acquired | 484,880 |  |  | 480,335 |  | 480,335 |  |  |
Liabilities assumed | 443,099 |  |  | 444,102 |  | 444,102 |  |  |
Goodwill | 15,600 |  |  | 15,589 |  | 15,589 |  |  |
Merger-related costs |  |  |  | 445 |  | 683 |  |  |
Sevier County Bancshares Inc [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired | $ 1,600 |  |  |  |  |  |  |  |
Useful life | 10 years |  |  |  |  |  |  |  |
Sevier County Bancshares Inc [Member] | Sevier County Bancshares Inc [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Threshold number of shares to be held by a shareholder to receive the per share stock consideration | 20,000 |  |  |  |  |  |  |  |
Fountain [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash consideration paid |  | $ 14,000 |  |  |  | 59,794 |  |  |
Repayment of indebtedness |  | 45,800 |  |  |  |  |  |  |
Future cash payments of performance-based earnout |  | 6,000 |  |  |  |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  | 1,696 |  | 2,834 |  |  |
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  | 357 |  | 702 |  |  |
Pro forma revenue |  |  |  | 36,690 | 31,566 | 102,470 | 89,016 |  |
Pro forma net income (loss) |  |  |  | 9,614 | $ 6,744 | 28,101 | $ 16,274 |  |
Assets acquired |  | 54,114 |  | 57,848 |  | 57,848 |  |  |
Liabilities assumed |  | 683 |  | 454 |  | 454 |  |  |
Goodwill |  | 2,400 |  | 2,400 |  | 2,400 |  |  |
Merger-related costs |  |  |  | 18 |  | 159 |  |  |
Fountain [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ 2,700 |  |  |  |  |  |  |
Useful life |  | 8 years |  |  |  |  |  |  |
Progressive Financial Group Inc. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash to be paid upon conversion (in dollars per share) |  |  | $ 474.82 |  |  |  |  |  |
Common shares to be converted (in shares) |  |  | 62.3808 |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 1,292,578 |  |  |  |  |  |
Cash consideration paid |  |  | $ 9,800 |  |  | 9,838 |  |  |
Assets acquired |  |  | 301,041 | 298,322 |  | 298,322 |  |  |
Liabilities assumed |  |  | 272,052 | 272,781 |  | 272,781 |  |  |
Goodwill |  |  | 8,800 | $ 8,844 |  | $ 8,844 |  |  |
Progressive Financial Group Inc. [Member] | Core Deposits [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 1,400 |  |  |  |  |  |
Useful life |  |  | 10 years |  |  |  |  |  |
Progressive Financial Group Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 1,100 |  |  |  |  |  |
Useful life |  |  | 10 years |  |  |  |  |  |
Progressive Financial Group Inc. [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 63 |  |  |  |  |  |
Useful life |  |  | 5 years |  |  |  |  |  |

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