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Securities - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) security | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) security | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) security
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Tax provision related to net realized gains | $ 0 | $ 0 | $ 0 | $ 460 |
Number of securities holdings | security | 0 |  | 0 |  | 0
Shareholders' equity percentage (greater than) | 10.00% |  | 10.00% |  | 10.00%
Collateral Pledged |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Debt securities, trading, restricted | $ 437,547 |  | $ 437,547 |  | $ 453,407

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