Condensed Financial Information (Parent Company Only) (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash on deposit with Bank	$ 18,357	$ 12,305
Cash on deposit with others	8,503	8,610
Deferred tax	12,037	12,084
Other Assets	15,429	12,938
Total assets	1,553,133	1,478,265
Liabilities
Other borrowings	4,189	9,458
Other liabilities	14,933	14,783
Total liabilities	1,413,095	1,341,240
Stockholders' Equity	140,038	137,025	$ 126,752	$ 110,629
Total liabilities and stockholders' equity	1,553,133	1,478,265
MutualFirst Financial, Inc. [Member]
Assets
Cash on deposit with Bank	1,098	2,732
Cash on deposit with others	24	24
Total cash	1,122	2,756
Investment in common stock of subsidiaries	142,812	143,459
Deferred tax	146	214
Other Assets	265	262
Total assets	144,345	146,691
Liabilities
Other borrowings	4,189	9,458
Other liabilities	118	208
Total liabilities	4,307	9,666
Stockholders' Equity	140,038	137,025
Total liabilities and stockholders' equity	$ 144,345	$ 146,691