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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 20, 2015
Nov. 01, 2014
Dec. 31, 2015
Dec. 31, 2014
Goodwill        
Goodwill     $ 45,664 $ 13,044
Impairment charges     $ 0  
BVF/CSNK        
Goodwill        
Goodwill acquired   $ 13,044    
Focus Business Bank        
Goodwill        
Goodwill $ 32,620      
Goodwill acquired $ 32,620