Condensed Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities
Net income	$ 7,246	$ 3,484	$ 6,552
Item not requiring cash
ESOP shares earned	328	268	233
Deferred income tax benefit	582	(88)	429
Other	498	655	163
Net cash provided by operating activities	20,498	31,927	17,054
Financing Activities
Repayment of other borrowings	(847)	(800)	(989)
Proceeds from issuance of preferred stock		28,923
Cash dividends	(3,113)	(3,419)	(3,265)
Proceeds from stock options exercised	551	17	0
Net cash provided by (used in) financing activities	(14,476)	9,614	3,113
Net Change in Cash	(22,445)	31,825	(22,943)
Cash and Cash Equivalents, Beginning of Year	55,223	23,398	46,341
Cash and Cash Equivalents, End of Year	32,778	55,223	23,398
MutualFirst Financial, Inc.
Operating Activities
Net income	7,246	3,484	6,552
Item not requiring cash
ESOP shares earned	329	268	233
Deferred income tax benefit	(263)	46	5
(Equity in undistributed income) distributions in excess of income of subsidiary	(3,086)	3,321	(3,832)
Other	462	893	380
Net cash provided by operating activities	4,688	8,012	3,338
Financing Activities
Repayment of other borrowings	(847)	(800)	(764)
Proceeds from issuance of preferred stock		28,923
Stock repurchased		(33,282)
Cash dividends	(3,113)	(3,420)	(3,265)
Proceeds from stock options exercised	551	17
Net cash provided by (used in) financing activities	(3,409)	(8,562)	(4,029)
Net Change in Cash	1,279	(550)	(691)
Cash and Cash Equivalents, Beginning of Year	1,675	2,225	2,916
Cash and Cash Equivalents, End of Year	$ 2,954	$ 1,675	$ 2,225