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Business Combinations (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 13 Months Ended | 17 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2022 | Sep. 01, 2021 | May 03, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 1.00 |  | $ 1 |  | $ 1 |  | $ 1 | $ 1 | $ 1 |
Goodwill |  |  |  | $ 96,145 |  | $ 96,145 |  | $ 96,145 | $ 96,145 | $ 91,565 | $ 74,135
Merger-related costs |  |  |  | 87 | $ 464 | $ 607 | $ 939 |  |  |  |
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) |  | 1,692,168 |  |  |  | 1,692,168 |  |  |  |  |
Purchase price/Cash |  | $ 9,600 |  |  |  |  |  | 9,568 |  |  |
Assets acquired |  | 484,880 |  | 477,500 |  | $ 477,500 |  | 477,500 | 477,500 |  |
Liabilities assumed |  | 443,099 |  | 442,848 |  | 442,848 |  | 442,848 | 442,848 |  |
Goodwill |  | 17,200 |  | 17,171 |  | 17,171 |  | 17,171 | 17,171 |  |
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] |  |  |  |  |  |  |  |  |  |  |
Purchase price/Cash |  |  | $ 14,000 |  |  |  |  |  | 59,794 |  |
Repayment of indebtedness |  |  | 45,800 |  |  |  |  |  |  |  |
Future cash payments of performance-based earnout |  |  | 6,000 |  |  |  |  |  |  |  |
Assets acquired |  |  | 54,114 | 57,848 |  | 57,848 |  | 57,848 | 57,848 |  |
Liabilities assumed |  |  | 683 | 454 |  | 454 |  | 454 | 454 |  |
Goodwill |  |  | 2,400 | 2,400 |  | 2,400 |  | 2,400 | 2,400 |  |
Fountain [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 2,700 |  |  |  |  |  |  |  |
Useful life |  |  | 8 years |  |  |  |  |  |  |  |
Sunbelt Group LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase price/Cash |  |  |  |  |  | 6,500 |  |  |  |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  |  | 168 |  | 168 |  |  |  |  |
Pro forma information, earnings (loss) since acquisition date, actual |  |  |  | 1 |  | 1 |  |  |  |  |
Pro forma revenue |  |  |  | 43,008 | 37,335 | 120,681 | 102,613 |  |  |  |
Pro forma net income (loss) |  |  |  | 11,548 | $ 9,750 | 29,992 | $ 28,612 |  |  |  |
Assets acquired | $ 349 |  |  | 2,284 |  | 2,284 |  | 2,284 | 2,284 |  |
Liabilities assumed | 364 |  |  | 364 |  | 364 |  | 364 | 364 |  |
Purchase consideration paid in cash | 5,200 |  |  |  |  |  |  |  |  |  |
Goodwill | 4,600 |  |  | 4,580 |  | 4,580 |  | $ 4,580 | $ 4,580 |  |
Merger-related costs |  |  |  | $ 20 |  | $ 20 |  |  |  |  |
Sunbelt Group LLC [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired | $ 1,900 |  |  |  |  |  |  |  |  |  |
Useful life | 14 years |  |  |  |  |  |  |  |  |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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