Loans - Schedule of Loans Measured at Fair Value (Details) - Fair Value, Recurring - Fair Value - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	$ 23,717,024	$ 21,011,621
Accumulated interest	153,167	148,990
Cumulative fair value adjustments	1,330,990	961,644
Total fair value of loans	25,201,181	22,122,255
Personal Loans \| Personal loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	16,199,604	14,498,629
Accumulated interest	118,169	114,541
Cumulative fair value adjustments	925,051	717,403
Total fair value of loans	17,242,824	15,330,573
Student Loans \| Student Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	7,437,305	6,445,586
Accumulated interest	34,956	34,357
Cumulative fair value adjustments	404,406	245,541
Total fair value of loans	7,876,667	6,725,484
Home Loans \| Home Loans
Loans and Leases Receivable Disclosure [Line Items]
Unpaid principal balance	80,115	67,406
Accumulated interest	42	92
Cumulative fair value adjustments	1,533	(1,300)
Total fair value of loans	$ 81,690	$ 66,198

Financing Receivable, Cumulative Fair Value Adjustments

No definition available.

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

- Definition

Financing Receivable, Unpaid Principal, Before Allowance For Credit Loss

+ References

No definition available.

+ Details

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

- Definition

Amount, before allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

+ Details

Name:	us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

+ Details

Name:	us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_StudentLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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