Summary of Significant Accounting Policies (Policies)	6 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2018
Accounting Policies [Abstract]
Accrued Interest	Accrued Interest Accrued interest income on loans is calculated based on the contractual interest rate of the loan and recorded as interest income as earned. Loans are placed on non-accrual status upon reaching 90 days past due. When a loan is placed on non-accrual status, the Company stops accruing interest and reverses all accrued but unpaid interest as of such date. Accrued interest payable on notes, certificates and secured borrowings is also reduced when the corresponding loan is placed on non-accrual status, due to the payment dependent structure of the notes, certificates and secured borrowings.
Revenue Recognition	Revenue Recognition Transaction Fees: Transaction fees are considered revenue from contracts with customers. The Company receives transaction fees for the performance obligation of providing loan application processing and loan facilitation services for the issuing banks and education and patient service providers. Transaction fee contracts contain a single performance obligation, which consists of a series of distinct services that are substantially the same with the same pattern of transfer to customers. Transaction fees are based on the initial principal amount of the loans facilitated by the Company and paid by the issuing banks and education and patient service providers each time a loan is issued by the issuing banks. Transaction fees to which the Company expects to be entitled are variable consideration because loan volume originated over the contractual term is not known at the contract’s inception. The transaction fee is determined each time a loan is issued based on that loan’s initial principal amount. The Company pays WebBank a loan trailing fee as consideration payable to customers (the issuing banks and education and patient service providers). The loan trailing fee liability is recorded in “Accrued Expense and Other Liabilities” on the Company’s Condensed Consolidated Balance Sheets. See “Loan Trailing Fee Liability” in “Part II – Item 8. Financial Statements and Supplementary Data – Notes to Consolidated Financial Statements – Note 2. Summary of Significant Accounting Policies” in the Company’s Annual Report on Form 10-K for further discussion. Additionally, the Company assumes the issuing bank’s obligation under Utah law to refund the pro-rated amount of the transaction fee in excess of 5% in the event the borrower prepays the loan in full before maturity. Additionally, the Company may provide refunds to borrowers when the borrower cancels the loan under certain conditions. The Company estimates refunds based on historical information. Transaction fees are reduced by estimated trailing fees and refunds. Because the contract contains a single performance obligation, the entire transaction fee is allocated to the single performance obligation, which is satisfied at the time a loan facilitated by the Company is issued by the issuing banks. Because revenue is recognized at the same time that payments are received, there are no associated contract assets, contract liabilities, or accounts receivable. The Company pays sales incentives to certain employees to promote the platform and certain programs. These costs do not qualify as deferred contract costs and are expensed as incurred because they are not incremental costs of obtaining a contract with a customer. Investor Fees: Note investors, certain certificate holders and whole loan purchasers typically pay LendingClub a servicing fee on each payment received from a borrower or on the investors’ month-end principal balance of loans serviced. The servicing fee compensates the Company for managing payments from borrowers and payments to investors and maintaining investors’ platform accounts. The Company records servicing fees when received as a component of “Investor fees” in the Consolidated Statements of Operations. Servicing fees can be, and have been, modified or waived at management’s discretion. Investor fees also include the change in fair value of loan servicing assets and liabilities. Investor fees related to investment funds and separately managed accounts (SMAs) are revenue from contracts with customers. The Company receives the fees in exchange for the performance obligation of providing a series of distinct investment management services that are satisfied over time. The fees are payable monthly in arrears based on the month-end capital account or asset balance, but the fees can be, and have been, modified or waived at the discretion of LCAM. Investor fees related to funds and SMAs are recognized at the end of each month. Other Revenue: Other revenue primarily consists of referral fee revenue. Referral fees are revenue from contracts with customers. The Company refers prospective borrowers to third-party consumer loan providers after the prospective borrower applies for a loan through LendingClub’s platform but is denied credit. Referral contracts contain a single performance obligation, which consists of a series of distinct referral services that are satisfied over time. The Company recognizes referral fees for each distinct instance of referral service when the Company is entitled to receive payment, either at the time the referral is made or when the prospective borrower enters into a successful loan agreement with the third-party consumer loan provider, pursuant to the terms of the applicable referral agreement.
Adoption of New Accounting Standards	Adoption of New Accounting Standards The Company adopted the following accounting standards during the six month period ended June 30, 2018: Financial Accounting Standards Board (FASB) Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers (Topic 606): Under the standard, revenue is recognized when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. The Company adopted Topic 606 on January 1, 2018 using the modified retrospective method for all contracts not completed as of the date of adoption. For contracts that were modified before the effective date, the Company reflected the aggregate effect of all modifications when identifying performance obligations and allocating transaction price in accordance with practical expedient ASC 606-10-65-1-(f)-4. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The adoption of Topic 606 did not change (1) the timing and pattern of revenue recognition for revenue streams in the scope of Topic 606, which includes transaction fees, management fees, and referral revenue, (2) the presentation of revenue as gross versus net, or (3) the amount of contract assets, contract liabilities, and deferred contract costs. Therefore, the adoption of Topic 606 had no impact on the Company’s financial position, results of operations, equity or cash flows as of the adoption date or for the six month period ended June 30, 2018. The Company has included the disclosures required by Topic 606 in “Note 3. Revenue from Contracts with Customers.” ASU 2016-01 Financial Instruments – Overall (Subtopic: 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which amends the accounting for equity investments, changes disclosure requirements related to instruments at amortized cost and fair value, and clarifies how entities should evaluate deferred tax assets for securities classified as available for sale. The guidance also requires an entity to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability under the fair value option. The Company adopted ASU 2016-01 on January 1, 2018. The adoption did not impact the Company’s financial position, results of operations, or cash flows. The Company has included the disclosures required by ASU 2016-01 in “Note 8. Fair Value of Assets and Liabilities.” ASU 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments to address diversity in practice in how certain cash receipts and payments are presented and classified in the statements of cash flows. The guidance also clarifies how the predominance principle should be applied when cash receipts and cash payments have aspects of more than one class of cash flows. The Company adopted ASU 2016-15 on January 1, 2018 and applied it retrospectively to all periods presented in the Consolidated Statements of Cash Flows. The adoption did not impact the Condensed Consolidated Statements of Cash Flows. ASU 2016-18 Statement of Cash Flows (Topic 230): Restricted Cash, addresses the diversity in the classification and presentation of changes in restricted cash in the statements of cash flows, by requiring entities to combine the changes in cash and cash equivalents and restricted cash in one line. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash in the statements of cash flows. The Company adopted ASU 2016-18 on January 1, 2018 and applied it retrospectively to all periods presented in the Consolidated Statements of Cash Flows. Upon adoption, changes in restricted cash, which had previously been presented as investing activities, are now included within beginning and ending cash, cash equivalents and restricted cash in our Condensed Consolidated Statements of Cash Flows. ASU 2017-09 Compensation – Stock Compensation (Topic 718): Scope of Modification Accounting, clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. The Company prospectively adopted ASU 2017-09 on January 1, 2018. The adoption did not have an impact on the Company’s financial position, results of operations, cash flows or related disclosures. ASU 2018-02 Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which allows companies the option to reclassify stranded tax effects caused by the newly-enacted Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings. The ASU will be effective January 1, 2019 with early adoption permitted. The Company early adopted ASU 2018-02 on January 1, 2018. The adoption did not have a material impact on the Company’s financial position, results of operations, cash flows or related disclosures. New Accounting Standards Not Yet Adopted Updates to the new accounting standards not yet adopted as disclosed in the Company’s Annual Report on Form 10-K and recently issued are as follows: In June 2016, the FASB amended guidance related to impairment of financial instruments as part of ASU 2016-13 Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which will be effective January 1, 2020. The guidance replaces the incurred loss impairment methodology with an expected credit loss model for which a company recognizes an allowance based on the estimate of expected credit loss. The Company accounts for its loans at fair value through net income, which is outside the scope of Topic 326. For available for sale debt securities, the guidance will require recognition of expected credit losses by recognizing an allowance for credit losses when the fair value of the security is below amortized cost and the recognition of this allowance is limited to the difference between the security’s amortized cost basis and fair value. The Company is evaluating the impact this ASU will have on its financial position, results of operations, and cash flows. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to record on their balance sheets a lease liability for the obligation to make lease payments and a right-of-use (ROU) asset for the right to use the underlying asset for the lease term. Lessees may elect to not recognize lease liabilities and ROU assets for leases with terms of 12 months or less. The lease liability is measured at the present value of the lease payments over the lease term. The ROU asset will be based on the liability, adjusted for lease prepayments, lease incentives, and the lessee’s initial direct costs. For operating leases, lease expense will generally be recognized on a straight-line basis over the lease term. Lessor accounting activities are largely unchanged from existing lease accounting. The new standard is effective January 1, 2019 and requires modified retrospective transition approach, with early adoption permitted. The Company expects to adopt the new standard in the first quarter of 2019. The Company has dedicated internal resources, engaged a professional services firm, and is currently in the project planning phase of the implementation. The Company is evaluating the impact of this guidance on its financial position, results of operations, cash flows and related disclosures.