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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, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	$ 489,846	$ 426,568
Fair Value	483,318	423,581
Mortgage-backed securities [Member] | Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	74,353	64,905
Fair Value	73,854	64,619
Mortgage-backed securities [Member] | Non Agency [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	10,430	8,053
Fair Value	10,183	7,987
Asset-backed securities [Member] | Auto Loans [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	29,883	16,551
Fair Value	29,712	16,556
Asset-backed securities [Member] | Credit Card Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	32,225	13,481
Fair Value	31,985	13,457
Asset-backed securities [Member] | Other Receivables [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	4,437	4,599
Fair Value	4,426	4,604
Mortgage-Backed and Asset-Backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Cost or Amortized Cost	151,328	107,589
Fair Value	$ 150,160	$ 107,223

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=51813488&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=27724398&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=49167202&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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- Definition

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+ References

No definition available.

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