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Document and Entity Information (USD $)	6 Months Ended
Document and Entity Information (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jul. 29, 2011 Class A Shares	Jul. 29, 2011 Class B Shares
Entity Registrant Name	DONEGAL GROUP INC
Entity Central Index Key	0000800457
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float		$ 157,257,918
Entity Common Stock, Shares Outstanding			20,004,315	5,576,775