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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, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 668,868 | $ 653,715
Fair Value | 656,762 | 649,334
Mortgage-backed securities [Member] | Agency [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 140,252 | 118,014
Fair Value | 137,247 | 116,014
Mortgage-backed securities [Member] | Non Agency [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 29,023 | 17,676
Fair Value | 28,608 | 17,488
Asset-backed securities [Member] | Auto Loan Receivables [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 30,187 | 35,105
Fair Value | 29,845 | 34,962
Asset-backed securities [Member] | Credit Card Receivables [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 16,258 | 38,844
Fair Value | 16,074 | 38,719
Asset-backed securities [Member] | Other Receivables [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 26,772 | 12,317
Fair Value | 25,658 | 12,269
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 242,492 | 221,956
Fair Value | $ 237,432 | $ 219,452

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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