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Commitments and Contingencies (Details)
$ in Millions
Apr. 08, 2019
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 16, 2018
Loss Contingencies [Line Items]        
Notional amount of terminated commitment   $ 539.6 $ 467.9  
Mortgage Loans Held for Sale        
Loss Contingencies [Line Items]        
Mortgage loans with recourse provision in effect   $ 1.5    
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      
Subsequent Event | Community 1st Bank [Member]        
Loss Contingencies [Line Items]        
Number of banking offices acquired 3      
Construction Contracts        
Loss Contingencies [Line Items]        
Unrecorded Unconditional Purchase Obligation     $ 1.5