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Shareholders' Equity (Details) - USD ($) | 12 Months Ended | 57 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2021 | Oct. 15, 2021 | Nov. 30, 2020 | Nov. 30, 2019 | Feb. 28, 2019 | Mar. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Deferred compensation paid to participants |  |  |  | $ 5,900,000 |  |  |  |  |
Number of shares repurchased (in shares) | 106,744 | 1,117,208 | 282,000 |  |  |  |  |  |
Average price (in dollars per share) | $ 37.81 | $ 28.53 | $ 35.51 |  |  |  |  |  |
Value of repurchased shares | $ 4,000,000 | $ 31,900,000 | $ 10,000,000 |  |  |  |  |  |
Authorized repurchase amount |  |  |  |  |  | $ 20,000,000 | $ 40,000,000 | $ 25,000,000 |
Carolina Bank |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Deferred compensation plan | $ 1,800,000 | $ 2,200,000 |  | $ 1,800,000 |  |  |  |  | $ 7,700,000
Select |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |
Deferred compensation, value of stock |  |  |  |  | $ 5,100,000 |  |  |  |

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