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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
location
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounting Policies [Line Items]        
Number Of Branch Locations | location 145      
Number Of Days Used To Determine Treatment As Cash Equivalent 90      
FHLB membership stock purchase requirement cap $ 10,000,000      
Federal Home Loan Bank stock, par value $ 100      
Number of Days of Delinquency at Which Loans Are Categorized As Non Accrual Status 90      
Core Deposits [Member]        
Accounting Policies [Line Items]        
Estimated life of CDI, in years 10 years      
WASHINGTON        
Accounting Policies [Line Items]        
Number Of Branch Locations | location 70      
OREGON        
Accounting Policies [Line Items]        
Number Of Branch Locations | location 60      
IDAHO        
Accounting Policies [Line Items]        
Number Of Branch Locations | location 15      
Vehicles [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Estimated Useful Lives 5      
Minimum | Building and Building Improvements [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Estimated Useful Lives 5      
Minimum | Furniture and Fixtures [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Estimated Useful Lives 3      
Minimum | Software [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Estimated Useful Lives 3      
Maximum | Building and Building Improvements [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Estimated Useful Lives 39      
Maximum | Furniture and Fixtures [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Estimated Useful Lives 7      
Maximum | Software [Member]        
Accounting Policies [Line Items]        
Property, Plant and Equipment, Estimated Useful Lives 5      
Accounting Standards Update 2016-13        
Accounting Policies [Line Items]        
Change in allowance for credit loss due to adoption of new ASU   $ 1,632,000    
Change in allowance for unfunded commitments and letters of credit due to adoption of new ASU   $ 1,570,000 $ 0 $ 0
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU     2,500,000  
Accounting Standards Update 2016-13 | Retained Earnings        
Accounting Policies [Line Items]        
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU     $ 2,457,000  
Designated as Hedging Instrument | Interest rate collar        
Accounting Policies [Line Items]        
Derivative, Notional Amount $ 500,000,000.0