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Organization and Summary of Significant Accounting Policies - Deferred Compensation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Cash surrender value of life insurance $ 17,100 $ 15,100
Deferred compensation cost $ 16,808 $ 14,855