XML 17 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document And Entity Information Document - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Jan. 31, 2016
Jun. 30, 2015
Entity Information [Line Items]      
Entity Registrant Name GREEN DOT CORP    
Trading Symbol GDOT    
Entity Central Index Key 0001386278    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 895.6
Common Class A [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   50,113,873  
Convertible Series A preferred stock [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,518,512