The share prices of some thrifts and banks with large mortgage banking operations are likely to become more volatile as a result of a new accounting standard for the valuation of mortgage servicing rights.

Standard Federal Bancorp of Troy, Mich., recently became the first big thrift to adopt the rule, FAS 122, retroactively - adding $1.75 million, or 5 cents a share, to its net income for the first quarter. The company's share price jumped about 5% in the three days following the restatement.

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