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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 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 + Details
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