1st Source Corp. operates as a bank holding company for 1st Source Bank. It provides financial products and services through its subsidiaries. 1st Source Bank plans to open a new loan production office in Fort Wayne. The South Bend-based bank, which has a major footprint in Porter and LaPorte. South Bend, Ind. – 1st Source Bank is pleased to announce the realignment of responsibilities of Larry Mayers, SVP, Business Banking Group.