Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income
Interest income from Bank	$ 52	$ 92	$ 185
Total interest and dividend income	55,348	61,353	67,398
Expenses	14,704	20,034	25,195
Income tax benefit	2,632	329	1,676
Net Income	7,246	3,484	6,552
Preferred stock dividends and accretion	1,446	2,115	1,803
Net Income Available to Common Shareholders	5,800	1,369	4,749
MutualFirst Financial, Inc.
Income
Interest income from Bank	12	10	13
Dividends from Bank	5,200	7,904	3,600
Other income	17		1
Total interest and dividend income	5,229	7,914	3,614
Expenses	1,520	1,587	1,334
Income before income tax and equity in undistributed income of the Bank	3,709	6,327	2,280
Income tax benefit	(451)	(478)	(440)
Income before equity in undistributed income (distributions in excess of income) of the Bank	4,160	6,805	2,720
Equity in undistributed income (distributions in excess of income) of the Bank	3,086	(3,321)	3,832
Net Income	7,246	3,484	6,552
Preferred stock dividends and accretion	1,446	2,115	1,803
Net Income Available to Common Shareholders	$ 5,800	$ 1,369	$ 4,749