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Loans Held for Investment - Composition of Loan Portfolio (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Loans Held for Investment        
Gross loans held for investment $ 8,767,852 $ 6,198,627    
Deferred loan origination costs/(fees) and premiums/(discounts), net (8,648) (2,403)    
Loans held for investment 8,759,204 6,196,224    
Allowance for loan losses (33,306) (28,936) $ (27,143) $ (21,296)
Loans held for investment, net 8,725,898 6,167,288    
Loans held for sale, at lower of cost or fair value 52,880 23,426    
Unaccreted mark-to-market discount 71,700 29,100    
Business loans        
Loans Held for Investment        
Gross loans held for investment 4,097,463 3,337,866    
Business loans | Commercial and industrial        
Loans Held for Investment        
Gross loans held for investment 1,359,841 1,086,659    
Allowance for loan losses (10,384) (9,721) (8,309) (6,362)
Business loans | Franchise        
Loans Held for Investment        
Gross loans held for investment 735,366 660,414    
Allowance for loan losses (6,332) (5,797) (5,819) (3,845)
Business loans | Commercial owner occupied        
Loans Held for Investment        
Gross loans held for investment 1,675,528 1,289,213    
Allowance for loan losses (1,213) (767) (815) (1,193)
Business loans | SBA        
Loans Held for Investment        
Gross loans held for investment 193,487 185,514    
Allowance for loan losses (2,827) (2,890) (2,970) (1,039)
Business loans | Agribusiness        
Loans Held for Investment        
Gross loans held for investment 133,241 116,066    
Allowance for loan losses (3,565) (1,291) (169) 0
Real estate loans        
Loans Held for Investment        
Gross loans held for investment 4,555,653 2,767,830    
Real estate loans | Commercial non-owner occupied        
Loans Held for Investment        
Gross loans held for investment 1,931,165 1,243,115    
Allowance for loan losses (1,483) (1,266) (1,320) (1,715)
Real estate loans | Multi-family        
Loans Held for Investment        
Gross loans held for investment 1,554,692 794,384    
Allowance for loan losses (623) (607) (658) (2,927)
Real estate loans | One-to-four family        
Loans Held for Investment        
Gross loans held for investment 376,617 270,894    
Allowance for loan losses (719) (803) (846) (365)
Real estate loans | Construction        
Loans Held for Investment        
Gross loans held for investment 504,708 282,811    
Allowance for loan losses (4,820) (4,569) (5,140) (3,632)
Real estate loans | Farmland        
Loans Held for Investment        
Gross loans held for investment 138,479 145,393    
Allowance for loan losses (375) (137) (92) 0
Real estate loans | Land        
Loans Held for Investment        
Gross loans held for investment 49,992 31,233    
Allowance for loan losses (868) (993) (944) (198)
Consumer Loans | Consumer loans        
Loans Held for Investment        
Gross loans held for investment 114,736 92,931    
Allowance for loan losses $ (97) $ (95) $ (61) $ (20)