Bank of Santa Clarita said today its assets grew by 39 percent to $87 million in the first quarter ended March 31 versus assets of $31.2 million in the year-ago period. The bank trimmed its net loss to $134,000 for the quarter, down from $539,000 for the first quarter of 2005. Bank of Santa Clarita has received approval to open its first branch in Canyon Country. That office is expected to open during the first quarter of 2007.