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Fair Value Measurements - Schedule of Valuation Inputs and Assumptions (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate amount committed	$ 85,551
Conditional prepayment rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.123	0.179
Residual interests classified as debt	0.123	0.172
Conditional prepayment rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.292	0.320
Residual interests classified as debt	0.301	0.181
Conditional prepayment rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.143	0.199
Residual interests classified as debt	0.281	0.178
Annual default rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.004	0.004
Residual interests classified as debt	0.006	0.006
Annual default rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.065	0.054
Residual interests classified as debt	0.065	0.008
Annual default rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.011	0.011
Residual interests classified as debt	0.044	0.007
Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.058	0.048
Residual interests classified as debt	0.093	0.075
Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.105	0.105
Residual interests classified as debt	0.105	0.075
Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.076	0.067
Residual interests classified as debt	0.095	0.075
Loan funding probability | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate lock commitments	0.764	0.111
Student loan commitments	0.950	0.950
Loan funding probability | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate lock commitments	0.866	0.586
Student loan commitments	0.950	0.950
Loan funding probability | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate lock commitments	0.843	0.463
Student loan commitments	0.950	0.950
Personal loans | Conditional prepayment rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.153	0.173
Servicing rights	0.168	0.179
Personal loans | Conditional prepayment rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.287	0.255
Servicing rights	0.325	0.313
Personal loans | Conditional prepayment rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.203	0.191
Servicing rights	0.252	0.227
Personal loans | Annual default rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.043	0.038
Servicing rights	0.032	0.034
Personal loans | Annual default rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.400	0.377
Servicing rights	0.180	0.079
Personal loans | Annual default rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.046	0.044
Servicing rights	0.071	0.049
Personal loans | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.064	0.054
Servicing rights	0.085	0.078
Personal loans | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.094	0.083
Servicing rights	0.085	0.078
Personal loans | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.066	0.061
Servicing rights	0.085	0.078
Personal loans | Market servicing costs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.001	0.002
Personal loans | Market servicing costs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.006	0.005
Personal loans | Market servicing costs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.003	0.003
Student loans | Conditional prepayment rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.086	0.163
Servicing rights	0.106	0.154
Student loans | Conditional prepayment rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.130	0.218
Servicing rights	0.163	0.219
Student loans | Conditional prepayment rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.105	0.204
Servicing rights	0.122	0.178
Student loans | Annual default rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.003	0.002
Servicing rights	0.003	0.003
Student loans | Annual default rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.058	0.045
Servicing rights	0.036	0.043
Student loans | Annual default rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.005	0.005
Servicing rights	0.006	0.004
Student loans | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.045	0.036
Servicing rights	0.085	0.078
Student loans | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.091	0.087
Servicing rights	0.085	0.078
Student loans | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.048	0.040
Servicing rights	0.085	0.078
Student loans | Market servicing costs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.001	0.001
Student loans | Market servicing costs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.002	0.002
Student loans | Market servicing costs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.001	0.001
Home loans | Conditional prepayment rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.017	0.020
Servicing rights	0.051	0.049
Home loans | Conditional prepayment rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.098	0.102
Servicing rights	0.132	0.110
Home loans | Conditional prepayment rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.072	0.070
Servicing rights	0.054	0.052
Home loans | Annual default rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.001	0.001
Servicing rights	0.001	0.001
Home loans | Annual default rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.009	0.013
Servicing rights	0.002	0.001
Home loans | Annual default rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.001	0.001
Servicing rights	0.001	0.001
Home loans | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.063	0.057
Servicing rights	0.093	0.090
Home loans | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.092	0.141
Servicing rights	0.093	0.090
Home loans | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.067	0.059
Servicing rights	0.093	0.090
Home loans | Market servicing costs | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.001	0.001
Home loans | Market servicing costs | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.001	0.001
Home loans | Market servicing costs | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.001	0.001

X

- Definition

Debt Instrument, Residual Interests, Measurement Input

+ References

No definition available.

+ Details

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Namespace Prefix:	sofi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Interest Rate Lock Commitments, Measurement Input

+ References

No definition available.

+ Details

Name:	sofi_InterestRateLockCommitmentsMeasurementInput
Namespace Prefix:	sofi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Loan Origination Commitments

+ References

No definition available.

+ Details

Name:	sofi_LoanOriginationCommitments
Namespace Prefix:	sofi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Loans Receivable, Measurement Input

+ References

No definition available.

+ Details

Name:	sofi_LoansReceivableMeasurementInput
Namespace Prefix:	sofi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Residual Investments, Measurement Input

+ References

No definition available.

+ Details

Name:	sofi_ResidualInvestmentsMeasurementInput
Namespace Prefix:	sofi_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Student Loan Commitments, Measurement Input

+ References

No definition available.

+ Details

Name:	sofi_StudentLoanCommitmentsMeasurementInput
Namespace Prefix:	sofi_
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

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

X

- Definition

Value of input used to measure servicing asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_ServicingAssetMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=sofi_PersonalLoanPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=sofi_StudentLoanPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=sofi_HomeLoanPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: