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Business Combinations (Details)
$ in Thousands
6 Months Ended
Mar. 04, 2016
USD ($)
location
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 82,594   $ 78,610
Core Deposits        
Business Acquisition [Line Items]        
Useful life   10 years    
Bank Of America, Branch Locations        
Business Acquisition [Line Items]        
Number of businesses acquired | location 15      
Premium on deposits, percentage 2.00%      
Cash purchase price $ 9,700      
Cash and cash equivalents 456,611      
Premises and equipment, net 3,113      
Core deposit intangibles 6,427      
Goodwill 3,984   $ 4,000  
Other assets 463      
Total assets 470,598      
Deposits 469,889      
Other liabilities 709      
Total liabilities and shareholders' equity $ 470,598      
Expenses related to branch acquisition     $ 2,300  
Bank Of America, Branch Locations | Core Deposits        
Business Acquisition [Line Items]        
Useful life 9 years 12 months      
Bank Of America, Branch Locations | Oregon        
Business Acquisition [Line Items]        
Number of businesses acquired | location 12      
Bank Of America, Branch Locations | Washington        
Business Acquisition [Line Items]        
Number of businesses acquired | location 3