Regulatory Capital (Actual Capital Amounts and Ratios) (Details) - USD ($)		Dec. 31, 2016		Dec. 31, 2015
MutualFirst Consolidated [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Leverage Capital Level, Actual Capital Levels Amount		$ 138,971,000	[1]	$ 132,727,000
Total Risk-Based Capital Level, Actual Capital Levels Amount		151,353,000	[2]	145,368,000
Common Equity Tier 1 Capital Level Amount		136,606,000	[3]	131,520,000	[4]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Amount		$ 138,971,000	[5]	$ 132,727,000
Leverage Capital Level, Actual Capital Levels Ratio		9.00%	[1]	9.10%
Total Risk-Based Capital Level, Actual Capital Levels Ratio		13.20%	[2]	13.80%
Common Equity Tier 1 Capital Level, Actual Capital Levels Ratio		11.90%	[3]	12.50%	[4]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Ratio		12.10%	[5]	12.60%
Leverage Capital Level, Minimum Regulatory Capital Ratios Amount		$ 61,914,000	[1]	$ 58,608,000
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount		91,963,000	[2]	84,144,000
Common Equity Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount		51,729,000	[3]	47,331,000	[4]
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount		$ 68,973,000	[5]	$ 63,108,000
Leverage Capital Level, Minimum Regulatory Capital Ratios		4.00%	[1]	4.00%
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios		8.00%	[2]	8.00%
Common Equity Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios	[3]	4.50%
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios		6.00%	[5]	6.00%
Common Equity Tier 1 Risk-Based Capital Level, Minimum Required To Be Considered Well-Capitalized Amount	[4]			$ 4.5
Risk-Weighted Regulatory Capital Assets		$ 1,100,000,000		1,100,000,000
MutualBank [Member]
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Leverage Capital Level, Actual Capital Levels Amount		136,301,000	[1]	134,754,000
Total Risk-Based Capital Level, Actual Capital Levels Amount		148,683,000	[2]	147,395,000
Common Equity Tier 1 Capital Level Amount		136,301,000	[3]	134,754,000	[4]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Amount		$ 136,301,000	[5]	$ 134,754,000
Leverage Capital Level, Actual Capital Levels Ratio		8.80%	[1]	9.20%
Total Risk-Based Capital Level, Actual Capital Levels Ratio		12.90%	[2]	14.00%
Common Equity Tier 1 Capital Level, Actual Capital Levels Ratio		11.90%	[3]	12.80%	[4]
Tier 1 Risk-Based Capital Level, Actual Capital Levels Ratio		11.90%	[5]	12.80%
Leverage Capital Level, Minimum Regulatory Capital Ratios Amount		$ 61,832,000	[1]	$ 58,509,000
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount		91,904,000	[2]	84,106,000
Common Equity Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount		51,696,000	[3]	47,309,000	[4]
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios Amount		$ 68,928,000	[5]	$ 63,079,000
Leverage Capital Level, Minimum Regulatory Capital Ratios		4.00%	[1]	4.00%
Total Risk-Based Capital Level, Minimum Regulatory Capital Ratios		8.00%	[2]	8.00%
Common Equity Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios		4.50%	[3]	4.50%	[4]
Tier 1 Risk-Based Capital Level, Minimum Regulatory Capital Ratios		6.00%	[5]	6.00%
Leverage Capital Level, Minimum Required To be Considered Well-Capitalized Amount		$ 77,290,000	[1]	$ 73,136,000
Total Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Amount		114,880,000	[2]	105,132,000
Common Equity Tier 1 Risk-Based Capital Level, Minimum Required To Be Considered Well-Capitalized Amount		74,672,000	[3]	68,336,000	[4]
Tier 1 Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Amount		$ 91,904,000	[5]	$ 84,106,000
Leverage Capital Level, Minimum Required To be Considered Well-Capitalized Ratio		5.00%	[1]	5.00%
Total Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Ratio		10.00%	[2]	10.00%
Common Equity Tier 1 Risk-Based Capital Level, Minimum Required To Be Considered Well-Capitalized Ratio		6.50%	[3]	6.50%	[4]
Tier 1 Risk-Based Capital Level, Minimum Required To be Considered Well-Capitalized Ratio		8.00%	[5]	8.00%
Average Total Regulatory Capital Assets				$ 1,500,000,000
Risk-Weighted Regulatory Capital Assets				$ 1,100,000,000

[1] Tier 1 Capital to Average Total Assets of $1.5 billion for the Bank and Company at December 31, 2016.

[2] Total Capital to Risk-Weighted Assets.

[3] Common Equity Tier 1 Capital to Risk-Weighted Assets of $1.1 billion for the Bank and Company at December 31, 2016.

[4] Common Equity Tier 1 Capital to Risk-Weighted Assets of $1.1 billion for the Bank and Company at December 31, 2015.

[5] Tier 1 Capital to Risk-Weighted Assets.