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Business Combination - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2017 | May 19, 2017 | Mar. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid | $ 15,826 |  |  |
Pro-forma revenue |  |  | $ 6,800 |
Ownership percentage | 74.00% |  |  |
Pro forma, nonrecurring costs | $ 38,000 |  |  |
Pro-forma net income |  |  | 2,500 |
Pro forma revenue, acquisition |  |  |  | $ 25,200
Pro forma net income (loss) |  |  |  | $ 1,300
Fair value adjustment |  |  | 11 |
Atlantic Capital Bank, N.A. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration paid |  | $ 1,183 |  |
Pro-forma revenue |  |  | $ 309 |
Capstone Bancshares Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Exchange of shares | 0.85 |  |  |
Cash payment per share (in dollars per share) | $ 18.50 |  |  |
Percentage of common stock consideration transferred | 80.00% |  |  |
Percentage of cash consideration transferred | 20.00% |  |  |

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