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Organization (Details) store in Millions	6 Months Ended
	Jun. 30, 2018 customer store
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of stores | store	0.1
Number of customers served (more than) | 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