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Disclosure - SUBSEQUENT EVENT (Details) Sheet http://www.mainsourcefinancial.com/role/DisclosureSubsequentEventDetails SUBSEQUENT EVENT (Details) false false All Reports Book All Reports Element msfg_LoansAndLeasesReceivableCommitmentsInterestRates had a mix of decimals attribute values: 3 4. Element us-gaap_CashAcquiredFromAcquisition had a mix of decimals attribute values: -5 -3. Element us-gaap_Goodwill had a mix of decimals attribute values: -5 -3. Element us-gaap_PaymentsToAcquireBusinessesGross had a mix of decimals attribute values: -5 -3. Columns in Cash Flows statement 'CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)' have maximum duration 365 days and at least 47 values. Shorter duration columns must have at least one fourth (11) as many values. Column '1/1/2013 - 3/31/2013' is shorter (89 days) and has only 2 values, so it is being removed. Columns in Cash Flows statement 'CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)' have maximum duration 365 days and at least 47 values. Shorter duration columns must have at least one fourth (11) as many values. Column '4/1/2013 - 6/30/2013' is shorter (90 days) and has only 1 values, so it is being removed. 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Process Flow-Through: 00100 - Statement - CONSOLIDATED BALANCE SHEETS Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Process Flow-Through: Removing column 'Dec. 31, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 00200 - Statement - CONSOLIDATED STATEMENTS OF INCOME Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2013' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2013' Process Flow-Through: 00205 - Statement - CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) Process Flow-Through: 00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2014' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2014' Process Flow-Through: Removing column '3 Months Ended Dec. 31, 2013' Process Flow-Through: Removing column '3 Months Ended Sep. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Jun. 30, 2013' Process Flow-Through: Removing column '3 Months Ended Mar. 31, 2013' Process Flow-Through: 00405 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) Process Flow-Through: 00500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS msfg-20141231.xml msfg-20141231.xsd msfg-20141231_cal.xml msfg-20141231_def.xml msfg-20141231_lab.xml msfg-20141231_pre.xml true true