AFTER 3 1/2 YEARS OF community reinvestment tie-ups, a group of commonly controlled community banks in Wyoming and Montana plans to merge under one holding company in September.

First Interstate BancSystem of Montana Inc., Billings, received federal approval in May to acquire Commerce Bankshares of Wyoming Inc., across the state line in Sheridan, Wyo., ending several years of wrangling with community groups over its lending history in the nearby Northern Cheyenne Indian Reservation.

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