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Fair Value Measurements - Schedule of Valuation Inputs and Assumptions (Details) $ in Thousands	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
Personal loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate amount committed	$ 87,803	$ 0
Student loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate amount committed	$ 592,540	$ 437,470
Minimum | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.113	0.119
Residual interests classified as debt	0.117	0.120
Minimum | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.007	0.007
Residual interests classified as debt	0.010	0.011
Minimum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.053	0.051
Residual interests classified as debt	0.095	0.095
Minimum | Loan funding probability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
IRLCs	0.644	0.586
Student loan commitments	0.890	0.890
Personal loan commitments	0.972
Minimum | Personal loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.002	0.001
Minimum | Personal loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.154	0.183
Servicing rights	0.156	0.150
Minimum | Personal loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.040	0.037
Servicing rights	0.010	0.010
Minimum | Personal loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.049	0.044
Servicing rights	0.085	0.085
Minimum | Student loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.001	0.001
Minimum | Student loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.093	0.096
Servicing rights	0.097	0.064
Minimum | Student loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.004	0.004
Servicing rights	0.003	0.003
Minimum | Student loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.041	0.037
Servicing rights	0.085	0.085
Minimum | Home loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.007	0.001
Minimum | Home loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.082	0.062
Servicing rights	0.044	0.047
Minimum | Home loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.005	0.001
Servicing rights	0.001	0.000
Minimum | Home loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.060	0.049
Servicing rights	0.090	0.093
Maximum | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.367	0.365
Residual interests classified as debt	0.117	0.120
Maximum | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.091	0.086
Residual interests classified as debt	0.010	0.011
Maximum | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.300	0.300
Residual interests classified as debt	0.095	0.095
Maximum | Loan funding probability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
IRLCs	0.780	0.756
Student loan commitments	0.990	0.990
Personal loan commitments	0.994
Maximum | Personal loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.014	0.011
Maximum | Personal loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.321	0.307
Servicing rights	0.376	0.394
Maximum | Personal loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.183	0.379
Servicing rights	0.175	0.180
Maximum | Personal loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.069	0.066
Servicing rights	0.193	0.190
Maximum | Student loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.004	0.003
Maximum | Student loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.128	0.129
Servicing rights	0.154	0.151
Maximum | Student loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.068	0.064
Servicing rights	0.037	0.037
Maximum | Student loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.082	0.082
Servicing rights	0.085	0.085
Maximum | Home loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.009	0.002
Maximum | Home loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.149	0.207
Servicing rights	0.145	0.215
Maximum | Home loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.010	0.074
Servicing rights	0.004	0.001
Maximum | Home loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.061	0.085
Servicing rights	0.128	0.100
Weighted Average | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.209	0.212
Residual interests classified as debt	0.117	0.120
Weighted Average | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.038	0.035
Residual interests classified as debt	0.010	0.011
Weighted Average | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residual investments	0.132	0.119
Residual interests classified as debt	0.095	0.095
Weighted Average | Loan funding probability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
IRLCs	0.715	0.697
Student loan commitments	0.939	0.945
Personal loan commitments	0.978
Weighted Average | Personal loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.003	0.003
Weighted Average | Personal loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.258	0.269
Servicing rights	0.249	0.243
Weighted Average | Personal loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.048	0.045
Servicing rights	0.048	0.050
Weighted Average | Personal loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.050	0.045
Servicing rights	0.105	0.101
Weighted Average | Student loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.002	0.002
Weighted Average | Student loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.110	0.112
Servicing rights	0.131	0.125
Weighted Average | Student loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.007	0.007
Servicing rights	0.010	0.009
Weighted Average | Student loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.043	0.039
Servicing rights	0.085	0.085
Weighted Average | Home loans | Market servicing costs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing rights	0.007	0.001
Weighted Average | Home loans | Conditional prepayment rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.149	0.136
Servicing rights	0.090	0.087
Weighted Average | Home loans | Annual default rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.005	0.006
Servicing rights	0.001	0.000
Weighted Average | Home loans | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans	0.060	0.059
Servicing rights	0.091	0.093

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

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

X

- Definition

Loan Origination Commitments

+ References

No definition available.

+ Details

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

X

- Definition

Loans Receivable, 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

Personal Loan Commitments, 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

Residual Investments, Measurement Input

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Student Loan Commitments, 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

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.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of input used to measure servicing asset.

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+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPrepaymentRateMember
Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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