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Investments - Schedule of Amortized Cost and Fair Value on Mortgage-Backed and Asset-Backed Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	$ 653,888	$ 653,715
Fair Value	644,238	649,334
Mortgage-backed securities [Member] | Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	132,498	118,014
Fair Value	129,750	116,014
Mortgage-backed securities [Member] | Non Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	19,650	17,676
Fair Value	19,286	17,488
Asset-backed securities [Member] | Auto Loan Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	39,313	35,105
Fair Value	39,011	34,962
Asset-backed securities [Member] | Credit Card Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	16,172	38,844
Fair Value	16,017	38,719
Asset-backed securities [Member] | Other Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	26,420	12,317
Fair Value	25,435	12,269
Mortgage-Backed and Asset-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	234,053	221,956
Fair Value	$ 229,499	$ 219,452

X

- 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

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X

- 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

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+ References

No definition available.

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