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Loans - Schedule of Loan Portfolio Segments (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Loan portfolio segments            
Loans held for investment $ 3,122,324   $ 2,934,898      
Allowance for loan losses (36,850) $ (35,625) (33,293) $ (33,529) $ (34,344) $ (40,686)
Unearned net loan fees (626)   (793)      
Total net loans 3,084,848   2,900,812      
Commercial            
Loan portfolio segments            
Loans held for investment 1,250,257   1,217,001      
Allowance for loan losses (16,351) (15,749) (15,398) (16,335) (17,349) (24,215)
Real estate - mortgage            
Loan portfolio segments            
Loans held for investment 1,259,648   1,171,596      
Allowance for loan losses (12,640) (12,804) (11,475) (10,537) (10,281) (10,372)
Construction and land            
Loan portfolio segments            
Loans held for investment 216,737   175,738      
Allowance for loan losses (3,446) (2,484) (1,997) (2,186) (2,335) (2,111)
Consumer            
Loan portfolio segments            
Loans held for investment 287,245   266,947      
Allowance for loan losses (2,545) (2,561) (2,803) (2,783) (2,660) (2,592)
Other            
Loan portfolio segments            
Loans held for investment 108,437   103,616      
Allowance for loan losses $ (981) $ (1,021) $ (945) $ (901) $ (786) $ (643)