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Business Combinations - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2021 USD ($) bank $ / shares shares | May 01, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid |  |  | $ 4,210 | $ 0
Goodwill |  |  | 52,906 | 15,992
Change in goodwill |  |  | 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 | 3,987,815 |  |  |
Fair value of shares issued | $ 71,400 |  |  |
Cash consideration paid | 21,600 |  |  |
Goodwill | 35,037 |  |  |
Revenue of acquiree since acquisition date, actual |  |  | 7,900 |
Net income of acquiree since acquisition date, actual |  |  | 6,000 |
Pro forma revenue |  |  | 121,900 | 114,700
Pro forma net income (loss) |  |  | 20,800 | $ 11,600
Credit impaired loans acquired | 306,302 |  |  |
Change in goodwill | $ 35,000 |  |  |
LBC Bancshares, Inc |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares of CBAN common stock issued to Southcrest shareholders (in shares) | shares | 3,987,815 |  |  |
Fair value of shares issued | $ 71,382 |  |  |
Cash consideration paid | 21,620 |  |  |
Loans | 307,456 |  |  |
Discount on loans purchased | $ 635 |  |  |
Discount on loans purchased, percentage of loan value | 210.00% |  |  |
Credit impaired loans acquired | $ 1,154 |  |  |
Change in goodwill |  | $ 15,700 |  |
Insurance Agencies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Change in goodwill |  |  | 1,900 |
Insurance Agencies | Customer Deposits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 2,300 |

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