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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | $ 721,755 | $ 650,575
Fair Value | 711,549 | 640,166
Mortgage-backed securities [Member] | Agency [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 118,014 | 110,724
Fair Value | 116,014 | 109,022
Mortgage-backed securities [Member] | Non Agency [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 17,676 | 19,408
Fair Value | 17,488 | 19,265
Asset-backed securities [Member] | Auto Loans Receivables [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 35,105 | 37,390
Fair Value | 34,962 | 37,429
Asset-backed securities [Member] | Credit Card Receivables [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 38,844 | 38,640
Fair Value | 38,719 | 38,568
Asset-backed securities [Member] | Other Receivables [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 12,317 | 10,517
Fair Value | 12,269 | 10,492
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost or Amortized Cost | 221,956 | 216,679
Fair Value | $ 219,452 | $ 214,776

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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