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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,316,419 | $ 1,162,919
Fair Value | 1,215,630 | 1,064,330
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 380,581 | 334,460
Fair Value | 347,131 | 303,146
Agency | Mortgage-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 187,979 | 165,507
Fair Value | 165,097 | 145,686
Non-agency | Mortgage-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 56,990 | 63,729
Fair Value | 48,963 | 55,102
Auto loan receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 66,262 | 53,686
Fair Value | 65,805 | 52,869
Credit card receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,644 | 3,414
Fair Value | 9,636 | 3,428
Other receivables | Asset-backed securities: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 59,706 | 48,124
Fair Value | $ 57,630 | $ 46,061

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