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Commitments, Contingencies and Concentrations of Risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employment Agreements      
Rental expense $ 4.8 $ 4.4 $ 3.8
CEO | Employment Agreements      
Employment Agreements      
Term of agreements (in years) 3 years    
Chief Banking Officer | Employment Agreements      
Employment Agreements      
Term of agreements (in years) 3 years    
Chief Financial Officer | Employment Agreements      
Employment Agreements      
Term of agreements (in years) 3 years    
Chief Credit Officer | Employment Agreements      
Employment Agreements      
Term of agreements (in years) 3 years