First City Bancorp revealed in a proxy statement that $37.7 million in loans to three directors--including one loan guaranteed by former Texas Gov. John B. Connally--are classed as "substandard." The Houston bank so far has charged off $10 million because of loans involving Texas oilmen and First City directors Corbin J. Robertson and Roy Huffington. A $3.7-million loan to Bryan Lewis, a former employee of BarnesConnally Investments, has been past due since February, 1984. Connally co-signed the note.