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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Finance Receivables (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net finance receivables	$ 1,314,233	$ 1,136,259	$ 1,059,554
Small Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net finance receivables	419,602	403,062	382,785
Large Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net finance receivables	882,514	715,210	655,932
Automobile Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net finance receivables	1,757	3,889	4,892
Retail Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net finance receivables	$ 10,360	$ 14,098	$ 15,945

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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

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

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