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40703 - Disclosure - FAIR VALUE - Reconciliation Of Gains and Losses on Level 3 Assets - (Details)
(http://www.mainsourcefinancial.com/role/DisclosureFairValueReconciliationOfGainsAndLossesOnLevel3AssetsDetails)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000720002 (http://www.sec.gov/CIK)
Fair Value, Hierarchy [Axis]Significant Unobservable Inputs (Level 3)
Measurement Frequency [Axis]Recurring basis
Assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Major Types of Debt and Equity Securities [Axis]Major Types of Debt and Equity Securities [Axis]
State and municipalOther securitiesState and municipalOther securities
Reconciliation and income statement classification of gains and losses
 
 
 
 
Balance at the beginning of the period
10,858,000  
6,524,000  
12,810,000  
2,503,000  
Included in other comprehensive income
(1,000) 
74,000  
(36,000) 
21,000  
Purchases
   
4,000,000  
Settlements
(737,000) 
 
(1,916,000) 
 
Balance at the end of the period
10,120,000  
 
6,598,000  
 
10,858,000  
 
6,524,000