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Goodwill and Other Intangible Assets (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]        
Goodwill additions $ 88,800,000 $ 0 $ 88,800,000.0 $ 0
Goodwill impairment charges $ 0 $ 0 $ 0 $ 0
Washington Banking | Core Deposits
       
Finite-Lived Intangible Assets [Line Items]        
Useful life     10 years  
Valley | Core Deposits
       
Finite-Lived Intangible Assets [Line Items]        
Useful life     10 years  
Northwest Commercial Bank | Core Deposits
       
Finite-Lived Intangible Assets [Line Items]        
Useful life     5 years  
Pierce Commercial Bank | Core Deposits
       
Finite-Lived Intangible Assets [Line Items]        
Useful life     4 years  
Cowlitz Bank | Core Deposits
       
Finite-Lived Intangible Assets [Line Items]        
Useful life     9 years  
Western Washington Bancorp | Core Deposits
       
Finite-Lived Intangible Assets [Line Items]        
Useful life     8 years