Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited consolidated financial statements are prepared in accordance with generally accepted accounting principles in the United States of America, or GAAP. We consolidated our wholly-owned subsidiaries and eliminated all significant intercompany balances and transactions. We have also prepared the accompanying unaudited consolidated financial statements in conformity with the instructions to Form 10-Q and Article 10 of Regulation S-X and, consequently, they do not include all of the annual disclosures required by GAAP. Reference is made to our Annual Report on Form 10-K for the year ended December 31, 2018 for additional disclosures, including a summary of our significant accounting policies. There have been no material changes to our significant accounting policies during the nine months ended September 30, 2019, other than the adoption of the accounting pronouncements discussed herein. In our opinion, the accompanying unaudited consolidated financial statements contain all adjustments, consisting of normal and recurring items, except as otherwise noted, necessary for the fair presentation of our financial position, results of operations and cash flows for the interim periods presented. Reclassifications Beginning with the first quarter of 2019, we present net interest income generated from operations at Green Dot Bank, our subsidiary bank, as a component of our total operating revenues. Prior year amounts, formerly reported below operating income on our consolidated statements of operations, have been reclassified to conform to our current year presentation on our consolidated statements of operations. This reclassification changed our previously reported total operating revenues, but had no impact on our previously reported consolidated net income or cash flows for any comparative periods presented. Net interest income at Green Dot Bank has become an increasingly important revenue component as Green Dot Bank's ability to invest its growing customer balances and generate interest income is one of several unique advantages we have as both a leading financial technology company and a federally regulated bank. Net interest income or expense generated outside of Green Dot Bank continues to be reported below operating income on our consolidated statements of operations. Recent Accounting Pronouncements Recently adopted accounting pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02") in order to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under previous GAAP. The guidance has been modified through Note 2—Summary of Significant Accounting Policies (continued) additional technical corrections since its original issuance, including optional transition relief as provided for under ASU No. 2018-11, Leases (Topic 842): Targeted Improvements. ASU 2016-02 requires that a lessee should recognize a liability to make lease payments and a right-of-use ("ROU") asset representing its right to use the underlying asset for leases with a term greater than 12 months. We adopted the new lease standard effective January 1, 2019, electing the optional transition method that permits the new standard to be applied prospectively, as of the effective date, without restating comparative periods presented. As a result, prior periods continue to be reported in accordance with our historical lease accounting policies. We elected the package of practical expedients under the new standard, which allows us to not reassess 1) whether any expired or existing contracts as of the adoption date are or contain a lease, 2) lease classification for any expired or existing leases as of the adoption date and 3) initial direct costs for any existing leases as of the adoption date. We did not elect to use the hindsight practical expedient under the new standard when determining the lease term and assessing any impairment of ROU assets. The adoption of ASU 2016-02 resulted in the recognition of operating ROU assets of approximately $17.9 million on our consolidated balance sheet and a corresponding lease liability of approximately $25.1 million. The difference between the lease assets and liabilities recognized on our consolidated balance sheets primarily relates to accrued rent on existing leases that were offset against the ROU assets upon adoption. The adoption of the standard did not have any impact on our consolidated statements of operations, comprehensive income, changes in stockholders’ equity and cash flows. See Note 15 — Leases, for discussion on updates to our lease accounting policies and additional disclosures. In August 2018, the FASB issued ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ("ASU 2018-15"), which amends ASC 350-40 to address implementation costs incurred in a cloud computing arrangement (CCA) that is a service contract. ASU 2018-15 aligns the accounting for costs incurred to implement a CCA that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. As a result, certain implementation costs incurred by companies under hosting arrangements will be deferred and amortized. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. We adopted the standard effective January 1, 2019 on a prospective basis, the effect of which did not have a material impact on our consolidated financial statements. Recently issued accounting pronouncements not yet adopted In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other ("ASU 2017-04"): Simplifying the Test for Goodwill Impairment, which simplifies the existing two-step guidance for goodwill impairment testing by eliminating the second step resulting in a write-down to goodwill equal to the initial amount of impairment determined in step one. The ASU is to be applied prospectively for reporting periods beginning after December 15, 2019. We do not anticipate the new ASU will have any impact upon adoption and intend to adopt the new accounting pronouncement upon its effective date on January 1, 2020. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13") that requires financial assets measured at amortized cost be presented at the net amount expected to be collected. Credit losses on available-for-sale debt securities should be recorded through an allowance for credit losses limited by the amount that the fair value is less than amortized cost. The amendments of ASU 2016-13 eliminate the probable incurred loss recognition model under current GAAP and introduces a forward-looking approach, based on expected losses, to estimate credit losses on certain types of financial instruments. The estimate of expected credit losses will require entities to incorporate considerations of historical information, current information, and reasonable and supportable forecasts. The new ASU also expands the disclosure requirements to enable users of financial statements to understand the entity’s assumptions, models, and methods for estimating expected credit losses. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact of ASU 2016-13 on our consolidated financial statements and intend to adopt the new accounting pronouncement upon its effective date on January 1, 2020.