DOCUMENT AND ENTITY INFORMATION	6 Months Ended
	Jun. 30, 2012	Jul. 31, 2012
Entity Registrant Name	FIRST BANKS, INC
Entity Central Index Key	0000710507
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Trading Symbol	fbspra
Entity Common Stock, Shares Outstanding		23,661
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2012