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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, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 863,021 | $ 831,127
Fair Value | 884,093 | 820,438
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 329,492 | 312,840
Fair Value | 335,423 | 309,597
Agency [Member] | Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 148,574 | 139,418
Fair Value | 148,889 | 136,291
Non Agency [Member] | Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 73,639 | 61,689
Fair Value | 78,169 | 61,933
Auto Loan Receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 50,798 | 53,449
Fair Value | 51,215 | 53,341
Credit Card Receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 25,670 | 29,594
Fair Value | 25,982 | 29,366
Other Receivables [Member] | Asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 30,811 | 28,690
Fair Value | $ 31,168 | $ 28,666

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