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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 931,174 | $ 815,647
Fair Value | 913,131 | 819,861
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 330,939 | 319,377
Fair Value | 325,697 | 319,937
Agency | Mortgage-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 159,583 | 153,937
Fair Value | 156,281 | 153,758
Non-agency | Mortgage-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 57,231 | 54,231
Fair Value | 55,262 | 54,666
Auto loan receivables | Asset-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 68,860 | 68,188
Fair Value | 68,908 | 68,440
Credit card receivables | Asset-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,850 | 7,878
Fair Value | 7,855 | 7,891
Other receivables | Asset-backed Securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 37,415 | 35,143
Fair Value | $ 37,391 | $ 35,182

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