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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 |

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