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Goodwill and other Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Roll Forward]      
Beginning Balance $ 263,634 $ 264,997  
Goodwill adjustments   (1,363)  
Goodwill acquired 2,323    
Ending Balance 265,957 263,634 $ 264,997
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 48,926 47,717  
Less: accumulated amortization 31,661 27,400  
Net carrying amount 17,265 20,317  
Amortization Expense [Abstract]      
Amortization of intangible assets 4,864 5,047 $ 4,872
Future Amortization Expense [Abstract]      
2016 3,800    
2017 3,200    
2018 2,500    
2019 1,900    
2020 1,500    
Thereafter $ 4,400    
Minimum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible asset useful life 1 year    
Maximum [Member]      
Finite-Lived Intangible Assets [Line Items]      
Intangible asset useful life 12 years    
Core Deposits Intangibles [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 19,401 19,401  
Less: accumulated amortization 14,800 12,522  
Net carrying amount 4,601 6,879  
Identified Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 29,525 28,316  
Less: accumulated amortization 16,861 14,878  
Net carrying amount $ 12,664 $ 13,438