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Borrowings - Additional Information (Detail)										1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2021 USD ($)	Sep. 13, 2021 USD ($)	Mar. 30, 2021 USD ($)	Mar. 29, 2021 USD ($)	Mar. 23, 2021	Mar. 22, 2021	Jan. 31, 2020 USD ($)	Jan. 23, 2018 USD ($)	May 31, 2020 USD ($)	Aug. 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2018 USD ($) state	Dec. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Apr. 13, 2020 USD ($)	Nov. 30, 2018 USD ($)	Aug. 13, 2018 USD ($)
Short-term Debt [Line Items]
Secured debt	[1]	$ 19,791,000											$ 19,791,000		$ 19,791,000			$ 16,025,000
Interest expense													5,842,000	$ 4,038,000	15,535,000	$ 14,710,000
Amortized debt issuance costs													572,000	474,000	1,735,000	1,451,000
Debt issuance costs, net	[1]	1,650,000											1,650,000		1,650,000			2,598,000
Interest expense paid															16,046,000	15,692,000
Outstanding debt		50,000,000											50,000,000		50,000,000
Interest expense paid to related party													0	141,000	137,000	420,000
Paycheck Protection Program, CARES Act
Short-term Debt [Line Items]
Interest expense													13,000		90,000
Outstanding debt		0											0		0
Paycheck Protection Program, CARES Act | Extinguishment of Debt, Principal
Short-term Debt [Line Items]
Extinguishment of debt, amount			$ 6,354,000
Paycheck Protection Program, CARES Act | Extinguishment of Debt, Interest
Short-term Debt [Line Items]
Interest expense			$ 90,000
Secured borrowing payable
Short-term Debt [Line Items]
Purchase commitment by the unrelated third party										$ 165,000,000							$ 65,000,000
Purchase commitment by the unrelated third party, additional commitment										$ 100,000,000							$ 100,000,000
Finance receivable purchased		126,964,000											126,964,000		126,964,000			79,816,000
Secured debt		19,791,000											19,791,000		19,791,000			16,025,000
Interest expense													655,000	475,000	2,027,000	1,585,000
Capitalized issuance costs															168,000
Amortized debt issuance costs													4,000	13,000	29,000	38,000
Debt issuance costs, net		0											0		0			30,000
Debt agreement, maximum available amount		38,036,000											38,036,000		38,036,000
Outstanding debt		19,791,000											19,791,000		19,791,000			16,025,000
Secured borrowing payable | SPE II, LLC
Short-term Debt [Line Items]
Percentage of unsecured finance receivable sold																	97.50%
Percentage of preferred return																	15.00%
Term of extension																	1 year
Number of options to renew | state																	2
Term of purchase period renewal																	18 months
Senior debt
Short-term Debt [Line Items]
Debt agreement, maximum available amount		395,000,000											395,000,000		395,000,000
Outstanding debt		205,968,000											205,968,000		205,968,000			131,726,000
Senior debt | Revolving Line Of Credit, Maturing February 2022, OppFi-LLC
Short-term Debt [Line Items]
Capitalized issuance costs															294,000
Amortized debt issuance costs													0	3,000	21,000	19,000
Debt issuance costs, net																		21,000
Debt agreement, maximum available amount		0											0		0							$ 10,000,000
Interest expense paid														39,000	35,000	123,000
Outstanding debt		0											0		0			5,000,000
Senior debt | Revolving Line Of Credit, Maturing January 2024, Opportunity Funding SPE III, LLC
Short-term Debt [Line Items]
Interest expense													1,908,000	1,514,000	5,094,000	6,051,000
Capitalized issuance costs															2,100,000
Amortized debt issuance costs													177,000	171,000	530,000	565,000
Debt issuance costs, net		942,000											942,000		942,000			1,453,000
Debt agreement, maximum available amount		175,000,000						$ 175,000,000	$ 75,000,000				175,000,000		175,000,000
Debt agreement, interest payment frequency									monthly
Basis for effective rate								one-month LIBOR plus 6 percent with a 2 percent LIBOR floor
Outstanding debt		87,500,000											87,500,000		87,500,000			59,200,000
Senior debt | Revolving Line Of Credit, Maturing April 2023, Opportunity Funding SPE V, LLC
Short-term Debt [Line Items]
Interest expense													966,000	742,000	2,531,000	2,742,000
Capitalized issuance costs															1,158,000
Amortized debt issuance costs													106,000	100,000	318,000	283,000
Debt issuance costs, net		230,000											230,000		230,000			538,000
Debt agreement, maximum available amount		75,000,000										$ 75,000,000	75,000,000		75,000,000
Debt agreement, interest payment frequency												monthly
Outstanding debt		37,500,000											37,500,000		37,500,000			24,222,000
Senior debt | Revolving Line Of Credit, Maturing April 2023, Opportunity Funding SPE VI, LLC
Short-term Debt [Line Items]
Interest expense													644,000	494,000	1,688,000	1,843,000
Capitalized issuance costs															918,000
Amortized debt issuance costs													83,000	76,000	247,000	227,000
Debt issuance costs, net		178,000											178,000		178,000			425,000
Debt agreement, maximum available amount		50,000,000										$ 50,000,000	50,000,000		50,000,000
Debt agreement, interest payment frequency												monthly
Outstanding debt		25,000,000											25,000,000		25,000,000			16,148,000
Senior debt | Revolving Line Of Credit, Maturing February 2024, Opportunity Funding SPE IV, LLC; SalaryTap Funding SPE, LLC
Short-term Debt [Line Items]
Interest expense													110,000	104,000	332,000	401,000
Capitalized issuance costs															626,000
Amortized debt issuance costs													93,000	52,000	308,000	148,000
Debt issuance costs, net		50,000											50,000		50,000			131,000
Debt agreement, maximum available amount		$ 45,000,000									$ 25,000,000		45,000,000		45,000,000
Debt agreement, interest payment frequency											monthly
Basis for effective rate		LIBOR plus 3.85% with a 0.4% LIBOR floor
Outstanding debt		$ 7,500,000											7,500,000		7,500,000			12,506,000
Senior debt | Revolving Line Of Credit, Maturing February 2024, Opportunity Funding SPE IV, LLC; SalaryTap Funding SPE, LLC | SalaryTap Funding SPE, LLC
Short-term Debt [Line Items]
Capitalized issuance costs															250,000
Debt issuance costs, net		250,000											250,000		250,000
Senior debt | Term loan, net
Short-term Debt [Line Items]
Interest expense													1,546,000	670,000	3,738,000	1,965,000
Capitalized issuance costs															2,295,000
Amortized debt issuance costs													109,000	59,000	282,000	171,000
Debt issuance costs, net		1,532,000											1,532,000		1,532,000			331,000
Debt agreement, maximum available amount		50,000,000											50,000,000		50,000,000				$ 50,000,000		$ 25,000,000
Principal amount of debt		50,000,000											50,000,000		50,000,000			15,000,000
Proceeds from draw down of available commitment				$ 35,000,000
Outstanding debt		48,468,000											48,468,000		48,468,000			14,650,000
Unamortized discount		$ 0											0		$ 0			19,000
Senior debt | London Interbank Offered Rate (LIBOR) | Revolving Line Of Credit, Maturing February 2022, OppFi-LLC
Short-term Debt [Line Items]
Basis spread on variable rate															2.50%
Senior debt | London Interbank Offered Rate (LIBOR) | Revolving Line Of Credit, Maturing January 2024, Opportunity Funding SPE III, LLC
Short-term Debt [Line Items]
Basis spread on variable rate								6.00%							6.00%
Basis spread on variable rate floor								2.00%
Senior debt | London Interbank Offered Rate (LIBOR) | Revolving Line Of Credit, Maturing April 2023, Opportunity Funding SPE V, LLC
Short-term Debt [Line Items]
Basis spread on variable rate															7.25%
Senior debt | London Interbank Offered Rate (LIBOR) | Revolving Line Of Credit, Maturing April 2023, Opportunity Funding SPE VI, LLC
Short-term Debt [Line Items]
Basis spread on variable rate															7.25%
Senior debt | London Interbank Offered Rate (LIBOR) | Revolving Line Of Credit, Maturing February 2024, Opportunity Funding SPE IV, LLC; SalaryTap Funding SPE, LLC
Short-term Debt [Line Items]
Basis spread on variable rate		3.85%									4.25%				3.85%
Basis spread on variable rate floor		0.40%
Senior debt | London Interbank Offered Rate (LIBOR) | Term loan, net
Short-term Debt [Line Items]
Basis spread on variable rate						10.00%	14.00%								10.00%
Subordinated debt - related party
Short-term Debt [Line Items]
Debt agreement, maximum available amount		$ 0			$ 4,000,000								0		$ 0
Debt agreement, interest payment frequency					quarterly
Outstanding debt		0											0		0			4,000,000
Interest expense paid to related party														$ 141,000	137,000	$ 420,000
Other debt
Short-term Debt [Line Items]
Debt agreement, maximum available amount		0											0		0					$ 6,354,000
Outstanding debt		$ 0											$ 0		$ 0			$ 6,354,000
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