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Organization (Details) | 9 Months Ended
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Sep. 30, 2018 customer store
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of stores (in stores) | store | 100,000
Number of customers served (more than) (in customers) | customer | 25,000

X
- Definition Number of customers served by the company's products and/or services + References No definition available. + Details
Name: | gdot_NumberOfCustomersServed
Namespace Prefix: | gdot_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration