Document and Entity Information (USD $)	9 Months Ended
	Sep. 30, 2014	Nov. 06, 2014	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	FIRST MID ILLINOIS BANCSHARES INC
Entity Central Index Key	0000700565
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 70,804,315
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Entity Common Stock, Shares Outstanding		5,874,988
Document Period End Date	Sep. 30, 2014