SOUTH BEND, Ind. -- 1st Source Corp. said it has agreed in principle to purchase the shares of Trustcorp Mortgage Co. that it does not already own.

The acquisition is expected to be completed by yearend and will make Trustcorp Mortgage a wholly owned subsidiary of 1st Source Corp., a $1.6 billion-asset bank holding company.

Trustcorp Mortgage Co., also based in South Bend, has a $1 billion mortgage-servicing portfolio and originated more than $700 million of loans in 1993.

1st Source has been adding to its holdings of Trustcorp since it became a shareholder in 1990, said Christopher J. Murphy 3d, president of 1st Source.

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