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Loans - Composition of Loan Portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans Held for Investment        
Gross loans held for investment $ 6,198,627 $ 3,237,983    
Plus: Deferred loan origination costs/(fees) and premiums/(discounts), net (2,159) 3,630    
Loans held for investment 6,196,468 3,241,613    
Allowance for loan losses (28,936) (21,296) $ (17,317) $ (12,200)
Loans held for investment, net 6,167,532 3,220,317    
Less loans held for sale, net 23,426 7,711    
Servicing rights retained from guaranteed portion of SBA loans sold 8,800 5,300    
Unpaid principal balance for loans and participations serviced for others 635,000 303,000    
Business Loans        
Loans Held for Investment        
Gross loans held for investment 3,337,866 1,566,502    
Business Loans | Commercial and industrial        
Loans Held for Investment        
Gross loans held for investment 1,086,659 563,169    
Allowance for loan losses (9,721) (6,362) (3,449) (2,646)
Business Loans | Franchise        
Loans Held for Investment        
Gross loans held for investment 660,414 459,421    
Allowance for loan losses (5,797) (3,845) (3,124) (1,554)
Business Loans | Commercial owner occupied        
Loans Held for Investment        
Gross loans held for investment 1,289,213 454,918    
Allowance for loan losses (767) (1,193) (1,870) (1,757)
Business Loans | SBA        
Loans Held for Investment        
Gross loans held for investment 185,514 88,994    
Allowance for loan losses (2,890) (1,039) (1,500) (568)
Business Loans | Agribusiness        
Loans Held for Investment        
Gross loans held for investment 116,066 0    
Allowance for loan losses (1,291) 0 0 0
Real Estate Loans        
Loans Held for Investment        
Gross loans held for investment 2,767,830 1,667,369    
Real Estate Loans | Commercial non-owner occupied        
Loans Held for Investment        
Gross loans held for investment 1,243,115 586,975    
Allowance for loan losses (1,266) (1,715) (2,048) (2,007)
Real Estate Loans | Multi-family        
Loans Held for Investment        
Gross loans held for investment 794,384 690,955    
Allowance for loan losses (607) (2,927) (1,583) (1,060)
Real Estate Loans | One-to-four family        
Loans Held for Investment        
Gross loans held for investment 270,894 100,451    
Allowance for loan losses (803) (365) (698) (842)
Real Estate Loans | Construction        
Loans Held for Investment        
Gross loans held for investment 282,811 269,159    
Allowance for loan losses (4,569) (3,632) (2,030) (1,088)
Real Estate Loans | Farmland        
Loans Held for Investment        
Gross loans held for investment 145,393 0    
Allowance for loan losses (137) 0 0 0
Real Estate Loans | Land        
Loans Held for Investment        
Gross loans held for investment 31,233 19,829    
Allowance for loan losses (993) (198) (233) (108)
Consumer Loans | Consumer loans        
Loans Held for Investment        
Gross loans held for investment 92,931 4,112    
Allowance for loan losses $ (95) $ (20) $ (23) $ (24)