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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, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 840,646 | $ 828,336
Fair Value | 842,574 | 855,284
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 251,199 | 304,285
Fair Value | 253,002 | 311,079
Agency [Member] | Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 166,418 | 143,723
Fair Value | 168,027 | 144,729
Non Agency [Member] | Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 28,090 | 71,140
Fair Value | 28,259 | 75,896
Auto Loan Receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 31,811 | 42,767
Fair Value | 31,938 | 43,127
Credit Card Receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,712 | 21,145
Fair Value | 6,712 | 21,487
Other Receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18,168 | 25,510
Fair Value | $ 18,066 | $ 25,840

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