Bolstering its Illinois presence, Wisconsin-based First Financial Corp. agreed to buy FirstRock Bancorp in a stock swap transaction valued at roughly $72 million.

First Financial, a $5 billionasset thrift, said Wednesday it would exchange roughly 1.8 of its shares for each share of FirstRock, a $408 million-asset thrift based in Rockford. At $27.10 a share, the price equals 133% of book value or 14 times analysts' consensus earnings forecast for fiscal 1995, as published by First Call Corp.

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