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Business Combination (Details Textual) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2017 | May 19, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Total consideration in cash | $ 15,826,000 |  |
Ownership interest (as a percent) | 74.00% |  |
Pro forma, nonrecurring costs | $ 38,000,000 |  |
Pro forma, revenue of acquiree since acquisition date, actual |  |  | $ 5,000,000
Pro forma information, earnings (loss) since acquisition date, actual |  |  | 200,000
Pro forma revenue |  |  | 24,900,000
Pro forma net income (loss) |  |  | 947,000
Atlantic Capital Bank, N.A. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration in cash |  | $ 1,183,007 |
Pro forma, revenue of acquiree since acquisition date, actual |  |  | 903,311
Pro forma information, earnings (loss) since acquisition date, actual |  |  | $ 63,385
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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