The deal, whose terms were not disclosed, is expected to close this fall. With the execution of the First State sale agreement, Michigan National is poised to exit Texas by the fourth quarter. The company in April landed a $44 million cash purchase contract from Detroit-based Comerica Inc. for its other Lone Star property, the $331 million-asset Lockwood Banc Group Inc., Houston. Michigan National's withdrawal from Texas is part of a restructuring plan aimed at focusing and streamlining the $10.1 billion-asset company, which is struggling to regain consistent profitability after successive realty lending and mortgage banking difficulties. First State earned $3.4 million in 1993, according to Sheshunoff Information Services Inc., for returns of 1.33% on average assets and 17.64% on average equity. Cleveland-based Keycorp will fold State Home Savings into Society National Bank, its $22 billion-asset Ohio subsidiary.