Goodwill and Other Intangible Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amortized intangible assets:      
Balance at the beginning of period $ 9,571    
Amortization 2,884 3,132 3,315
Balance at the end of period 6,687 9,571  
Core deposit intangible assets      
Amortized intangible assets:      
Balance at the beginning of period 6,124    
Amortization 1,870    
Balance at the end of period 4,254    
Core deposit intangible assets | Maximum      
Goodwill and other intangibles assets      
Intangible asset estimated period 10 years    
Customer relationship intangible assets      
Amortized intangible assets:      
Balance at the beginning of period 3,447    
Amortization 1,014    
Balance at the end of period $ 2,433