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Fair Value Measurements - Schedule of Fair Value Measurement Input and Valuation Techniques of Installment Financing Receivables (Detail)	Sep. 30, 2021
Interest rate on finance receivables
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Installment financing receivable, fair value measurement	1.5110
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Installment financing receivable, fair value measurement	0.2170
Servicing fee
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Installment financing receivable, fair value measurement	0.0502
Remaining life
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Installment financing receivable, fair value measurement	0.58
Default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Installment financing receivable, fair value measurement	0.1909
Accrued interest
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Installment financing receivable, fair value measurement	0.0320
Prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Installment financing receivable, fair value measurement	0.2140

X

- Definition

Financing Receivable, Measurement Input

+ References

No definition available.

+ Details

Name:	opfi_FinancingReceivableMeasurementInput
Namespace Prefix:	opfi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=opfi_MeasurementInputServicingFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDefaultRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=opfi_MeasurementInputAccruedInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPrepaymentRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: