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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,039,042 | $ 815,647
Fair Value | 1,029,157 | 819,861
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 336,881 | 319,377
Fair Value | 333,754 | 319,937
Agency | Mortgage-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 149,850 | 153,937
Fair Value | 147,723 | 153,758
Non-agency | Mortgage-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 68,025 | 54,231
Fair Value | 66,940 | 54,666
Auto loan receivables | Asset-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 71,716 | 68,188
Fair Value | 71,764 | 68,440
Credit card receivables | Asset-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 4,756 | 7,878
Fair Value | 4,749 | 7,891
Other receivables | Asset-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 42,534 | 35,143
Fair Value | $ 42,578 | $ 35,182

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