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Shareholders' Equity (Details) - USD ($) |  |  |  |  | 12 Months Ended | 45 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2020 | May 05, 2019 | May 06, 2016 | May 05, 2016 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Nov. 30, 2019 | Feb. 28, 2019 | Mar. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred compensation paid to participants |  |  |  |  |  |  | $ 5,500,000 |  |  |
Equity issued related to acquisition |  |  |  |  | $ 494,000 | $ 3,070,000 |  |  |  |
Number of shares repurchased (in shares) |  |  |  |  | 1,117,208 | 282,000 |  |  |  |
Average price (in dollars per share) |  |  |  |  | $ 28.53 | $ 35.51 |  |  |  |
Value of repurchased shares |  |  |  |  | $ 31,900,000 | $ 10,000,000 |  |  |  |
Authorized repurchase amount |  |  |  |  | 20,000,000 |  | 20,000,000 | $ 40,000,000 | $ 25,000,000 |
Carolina Bank |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred compensation plan |  |  |  |  | $ 2,200,000 | $ 2,600,000 | $ 2,200,000 |  |  | $ 7,700,000
SBA Complete |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Earn-out period |  |  | 3 years | 3 years |  |  |  |  |  |
Earn-out liability |  |  |  | $ 3,000,000.0 |  |  |  |  |  |
Stock issued, shares |  | 78,353 |  |  |  |  |  |  |  |
Equity issued related to acquisition |  | $ 3,100,000 |  |  |  |  |  |  |  |
Magnolia Financial, Inc. |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Loans acquired | $ 14,600,000 |  |  |  |  |  |  |  |  |
Other assets acquired | 500,000 |  |  |  |  |  |  |  |  |
Liabilities assumed | 11,700,000 |  |  |  |  |  |  |  |  |
Total purchase price | 10,000,000.0 |  |  |  |  |  |  |  |  |
Payments for acquisition | $ 9,500,000 |  |  |  |  |  |  |  |  |
Number of shares issued | 24,096 |  |  |  |  |  |  |  |  |
Value of shares issued | $ 500,000 |  |  |  |  |  |  |  |  |

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