MainSource Financial Group, Inc. is a bank holding company. The Company operates a banking subsidiary, MainSource Bank (the Bank), an Indiana state-chartered bank. Through the Bank, the Company offers a range of financial services, including accepting time and transaction deposits; making consumer, commercial, agribusiness and real estate mortgage loans; renting safe deposit facilities; providing personal and corporate trust services, and providing other corporate services, such as letters of credit and repurchase agreements. The Bank offers various loans, such as commercial loans, commercial real estate loans, residential loans and consumer loans. Commercial loans include secured and unsecured loans, including real estate loans, to individuals and companies and to governmental units within the market area of the Bank. It offers various deposits, which include demand, interest bearing demand, savings/money markets and certificates of deposit.