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Summary of Significant Accounting Policies - Narrative (Details)
3 Months Ended
Jun. 16, 2017
shares
Jan. 27, 2017
USD ($)
shares
Mar. 31, 2018
USD ($)
market
Mar. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Number of markets entity operates | market     11  
Reduction in tax expense | $     $ (19,633,000) $ (13,791,000)
Underwritten public offering        
Schedule of Equity Method Investments [Line Items]        
Net proceeds of offering | $   $ 192,200,000    
Shares issued (in shares)   3,220,000    
Over-allotment option        
Schedule of Equity Method Investments [Line Items]        
Shares issued (in shares)   420,000    
Bankers Healthcare Group, LLC        
Schedule of Equity Method Investments [Line Items]        
Ownership interest (as percent)     49.00%  
Common Stock | BNC Bancorp        
Schedule of Equity Method Investments [Line Items]        
Common stock issued in conjunction with acquisition (in shares) 27,687,100