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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, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,146,378 | $ 1,152,852
Fair Value | 1,026,555 | 1,014,626
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 319,916 | 327,166
Fair Value | 284,447 | 287,607
Agency | Mortgage-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 159,078 | 157,672
Fair Value | 137,987 | 133,928
Non-agency | Mortgage-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 60,159 | 60,328
Fair Value | 50,711 | 50,478
Auto loan receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,531 | 62,128
Fair Value | 52,351 | 59,370
Credit card receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,657 | 657
Fair Value | 1,618 | 612
Other receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 44,491 | 46,381
Fair Value | $ 41,780 | $ 43,219

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