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Employee Benefit Plans (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
hour
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Percentage of employer contribution fully vested 100.00%    
Accrued expenses and other liabilities | Washington Banking      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Carrying value of obligation $ 165,000 $ 200,000  
401(k) Plan and Trust Salary Saving Plan      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Employer matching contribution, percent of employee's gross pay 50.00%    
Maximum annual contributions per employee, percent 3.00%    
Defined contribution plan, employer matching contribution amount $ 1,700,000 1,600,000 $ 1,400,000
401(k) Plan and Trust      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Minimum hours of service required for eligibility under the plan | hour 1,000    
Minimum age required for eligibility under the plan 18 years    
Employer profit sharing contributions $ 0 $ 0 $ 0