Cover Page - shares	9 Months Ended
	Sep. 30, 2022	Oct. 31, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-34819
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4766827
Entity Address, Address Line One	114 W 7th Street, Suite 240
Entity Address, City or Town	Austin,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78701
City Area Code	(626)
Local Phone Number	765-2000
Title of 12(b) Security	Class A Common Stock, $0.001 par value
Trading Symbol	GDOT
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		52,568,864
Entity Registrant Name	GREEN DOT CORP
Entity Central Index Key	0001386278
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false