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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 815,647 | $ 828,336
Fair Value | 819,861 | 855,284
Mortgage-backed and asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 319,377 | 304,285
Fair Value | 319,937 | 311,079
Agency [Member] | Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 153,937 | 143,723
Fair Value | 153,758 | 144,729
Non-agency [Member] | Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,231 | 71,140
Fair Value | 54,666 | 75,896
Auto loan receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 68,188 | 42,767
Fair Value | 68,440 | 43,127
Credit card receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,878 | 21,145
Fair Value | 7,891 | 21,487
Other receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 35,143 | 25,510
Fair Value | $ 35,182 | $ 25,840

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