REGULATORY MATTERS (Details)
$ in Thousands |
12 Months Ended |
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Dec. 31, 2016
USD ($)
item
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Dec. 31, 2014
USD ($)
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Jan. 01, 2019 |
Dec. 31, 2015
USD ($)
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Dec. 31, 2013
USD ($)
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| Actual and required capital amounts and ratios |
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| Number of ratios calculated according to the regulations for determining assigned capital category | item |
4
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| Basel III and Dodd Frank Rules |
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| Capital conservation buffer, percentage |
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0.00%
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| Total capital (to risk-weighted assets) |
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| Actual, Amount |
$ 407,802
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$ 356,210
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| Required for Adequate Capital, Amount |
$ 222,095
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$ 184,170
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| Actual, Ratio |
14.70%
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15.50%
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| Required for Adequate Capital, Ratio |
8.00%
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8.00%
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| Tier 1 capital (to risk-weighted assets) |
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| Actual, Amount |
$ 385,303
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$ 334,190
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| Required for Adequate Capital, Amount |
$ 166,571
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$ 138,127
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| Actual, Ratio |
13.90%
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14.50%
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| Required for Adequate Capital, Ratio |
6.00%
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6.00%
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| Common equity Tier 1 capital (to risk-weighted assets) |
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| Actual, Amount |
$ 344,212
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$ 293,316
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| Required for Adequate Capital, Amount |
$ 124,928
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$ 103,595
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| Actual, Ratio |
12.40%
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12.70%
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| Required for Adequate Capital, Ratio |
4.50%
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4.50%
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| Tier 1 capital (to average assets) |
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| Actual, Amount |
$ 385,303
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$ 334,190
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| Required for Adequate Capital, Amount |
$ 157,671
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$ 130,845
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| Actual, Ratio (as a percent) |
9.80%
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10.20%
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| Required for Adequate Capital, Ratio |
4.00%
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4.00%
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| Cash and cash equivalents |
$ 86,552
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$ 62,485
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$ 67,578
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$ 61,320
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| Prior To Federal Reserve Corrective Action Rules |
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| Basel III and Dodd Frank Rules |
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| Required minimum Tier 1 capital to risk weighted assets (as a percent ) |
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4.00%
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| Federal Reserve Corrective Action Rules |
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| Basel III and Dodd Frank Rules |
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| Capital conservation buffer, percentage |
0.625%
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| Required minimum Tier 1 capital to risk weighted assets (as a percent ) |
6.00%
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| Tier 1 capital (to average assets) |
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| Required for Adequate Capital, Ratio |
4.00%
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| Forecast 2019 |
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| Basel III and Dodd Frank Rules |
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| Capital conservation buffer, percentage |
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2.50%
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| Parent Company |
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| Tier 1 capital (to average assets) |
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| Cash and cash equivalents |
$ 10,366
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$ 6,322
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$ 14,846
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$ 11,667
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| MainSource Bank |
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| Basel III and Dodd Frank Rules |
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| Tier 1 leverage capital required to be well capitalized to average assets (as a percent) |
5.00%
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5.00%
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| Total capital (to risk-weighted assets) |
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| Actual, Amount |
$ 407,939
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$ 334,266
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| Required for Adequate Capital, Amount |
222,152
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184,168
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| To Be Well Capitalized, Amount |
$ 277,690
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$ 230,211
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| Actual, Ratio |
14.70%
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14.50%
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| Required for Adequate Capital, Ratio |
8.00%
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8.00%
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| To Be Well Capitalized, Ratio |
10.00%
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10.00%
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| Tier 1 capital (to risk-weighted assets) |
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| Actual, Amount |
$ 385,440
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$ 312,246
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| Required for Adequate Capital, Amount |
166,614
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138,126
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| To Be Well Capitalized, Amount |
$ 222,152
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$ 184,168
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| Actual, Ratio |
13.90%
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13.60%
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| Required for Adequate Capital, Ratio |
6.00%
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6.00%
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| To Be Well Capitalized, Ratio |
8.00%
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8.00%
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| Common equity Tier 1 capital (to risk-weighted assets) |
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| Actual, Amount |
$ 385,440
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$ 312,246
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| Required for Adequate Capital, Amount |
124,960
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103,595
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| To Be Well Capitalized, Amount |
$ 180,498
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$ 149,637
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| Actual, Ratio |
13.90%
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13.60%
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| Required for Adequate Capital, Ratio |
4.50%
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4.50%
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| To Be Well Capitalized, Ratio |
6.50%
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6.50%
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| Tier 1 capital (to average assets) |
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| Actual, Amount |
$ 385,440
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$ 312,246
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| Required for Adequate Capital, Amount |
157,390
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130,555
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| To Be Well Capitalized, Amount |
$ 196,737
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$ 163,194
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| Actual, Ratio (as a percent) |
9.80%
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9.60%
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| Required for Adequate Capital, Ratio |
4.00%
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4.00%
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| To Be Well Capitalized, Ratio |
5.00%
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5.00%
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