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Business Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 01, 2021 USD ($) shares | May 01, 2019 USD ($) bank $ / shares shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 52,706 |  | $ 52,706 |  | $ 15,992
Goodwill adjustment |  |  |  |  | 0 | $ 485 |
SouthCrest Financial Group, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of banking locations | bank |  | 8 |  |  |  |  |
Cash paid in exchange for each share (in dollars per share) | $ / shares |  | $ 10.45 |  |  |  |  |
Shares exchanged for each share (in shares) | shares |  | 0.7318 |  |  |  |  |
Shares of CBAN common stock issued to Southcrest shareholders (in shares) | shares |  | 3,987,898 |  |  |  |  |
Estimated fair value of CBAN common stock issued |  | $ 71,400 |  |  |  |  |
Cash consideration paid |  | $ 21,600 |  |  |  |  |
Goodwill | $ 35,037 |  |  |  |  |  |
Revenue of acquiree since acquisition date, actual |  |  | 3,000 |  | 3,000 |  |
Net income of acquiree since acquisition date, actual |  |  | 2,300 |  | 2,300 |  |
Pro forma revenue |  |  | 28,900 | $ 29,500 | 90,900 | 82,600 |
Pro forma net income (loss) |  |  | 4,300 | $ 5,500 | $ 16,600 | $ 5,800 |
Credit impaired loans acquired | $ 306,302 |  |  |  |  |  |
LBC Bancshares, Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares of CBAN common stock issued to Southcrest shareholders (in shares) | shares | 3,987,815 |  |  |  |  |  |
Estimated fair value of CBAN common stock issued | $ 71,382 |  |  |  |  |  |
Cash consideration paid | 21,620 |  |  |  |  |  |
Loans | 307,456 |  |  |  |  |  |
Discount on loans purchased | $ 635 |  |  |  |  |  |
Discount on loans purchased, percentage of loan value | 2.07% |  |  |  |  |  |
Credit impaired loans acquired | $ 1,154 |  |  |  |  |  |
Insurance Agencies |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill adjustment |  |  | 1,700 |  |  |  |
Insurance Agencies | Customer Deposits |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 1,700 |  |  |  |

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