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Investments (Additional Information) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Schedule of Investments [Line Items]      
Trading securities $ 4,428,000 $ 4,161,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0 0 $ 0
Net unrealized (loss) gain on available-for-sale securities, net of tax (1,173,000) 29,310,000  
Deferred Tax Liabilities, Investments 321,000    
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross   8,000,000  
Debt Securities, Held-to-maturity, Allowance for Credit Loss 0 0  
Debt Securities, Held-to-Maturity, Excluded Accrued Interest from Amortized Cost 10,000 10,000  
Security Owned And Pledged As Collateral Amortized Cost 640,100,000 485,000,000  
Security Owned and Pledged as Collateral, Fair Value 641,200,000 507,100,000  
Available-for-sale Securities      
Schedule of Investments [Line Items]      
Interest Receivable $ 3,400,000 $ 3,100,000