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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	$ 817,463	$ 717,775	$ 628,444
Small Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	375,772	358,471	338,157
Large Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	347,218	235,349	146,553
Automobile Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	61,423	90,432	116,109
Retail Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	$ 33,050	$ 33,523	$ 27,625

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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=82891408&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=84173941&loc=d3e5074-111524

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