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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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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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-Name Accounting Standards Codification
-Topic 805
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-Section 50
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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