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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Schedule of Average Recorded Investment in Impaired Finance Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Impaired [Line Items]
Total average recorded investment	$ 8,447	$ 6,175	$ 7,920	$ 6,166
Branch Small [Member]
Financing Receivable, Impaired [Line Items]
Total average recorded investment	922	613	731	602
Convenience Checks [Member]
Financing Receivable, Impaired [Line Items]
Total average recorded investment	639	527	539	525
Large [Member]
Financing Receivable, Impaired [Line Items]
Total average recorded investment	3,930	1,276	3,543	1,269
Automobile [Member]
Financing Receivable, Impaired [Line Items]
Total average recorded investment	2,845	3,630	2,994	3,645
Retail [Member]
Financing Receivable, Impaired [Line Items]
Total average recorded investment	$ 111	$ 129	$ 113	$ 125

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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.

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- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524

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