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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%