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Commitments and Contingencies (Details)
$ / shares in Units, $ in Millions
Oct. 11, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
Aug. 16, 2018
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]        
Notional amount of terminated commitment   $ 464.2   $ 433.0
Mortgage Loans Held for Sale        
Loss Contingencies [Line Items]        
Mortgage loans with recourse provision in effect   0.5    
Construction Contracts        
Loss Contingencies [Line Items]        
Commitments under construction contracts   $ 5.4    
Inland Northwest Bank        
Loss Contingencies [Line Items]        
Number of banking offices acquired     20  
Subsequent Event | Idaho Independent Bank [Member]        
Loss Contingencies [Line Items]        
Number of banking offices acquired 11      
Estimate of Payments to Acquire Businesses, Gross $ 181.3      
Subsequent Event | Community 1st Bank [Member]        
Loss Contingencies [Line Items]        
Number of banking offices acquired 3      
Estimate of Payments to Acquire Businesses, Gross $ 21.5      
Community 1st Bank [Member] | Subsequent Event        
Loss Contingencies [Line Items]        
Estimate value per share of Acquisition | $ / shares $ 17.20      
Inland Northwest Bank | Subsequent Event        
Loss Contingencies [Line Items]        
Estimate value per share of Acquisition | $ / shares $ 22.73