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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	$ 717,775	$ 628,444	$ 546,192
Small Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	358,471	338,157	319,533
Large Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	235,349	146,553	46,147
Automobile Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	90,432	116,109	154,382
Retail Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	$ 33,523	$ 27,625	$ 26,130

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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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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

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