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Commitments and Contingencies (Details)
$ / shares in Units, $ in Millions
Apr. 25, 2018
USD ($)
office
$ / shares
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 30, 2017
$ / shares
Loss Contingencies [Line Items]        
Notional amount of terminated commitment   $ 466.2 $ 433.0  
Price per share (in dollars per share) | $ / shares       $ 34.30
Mortgage Loans Held for Sale        
Loss Contingencies [Line Items]        
Mortgage loans with recourse provision in effect   0.6    
Construction Contracts        
Loss Contingencies [Line Items]        
Commitments under construction contracts   $ 1.2    
Subsequent Event | INB        
Loss Contingencies [Line Items]        
Date of agreement and plan for merger with Cascade Bancorp Apr. 25, 2018      
Number of banking offices acquired | office 20      
All-stock transaction value $ 160.9      
Price per share (in dollars per share) | $ / shares $ 21.03