NEW HAMPSHIRE SAVINGS <NHSB> TO BUY BANK New Hampshire Savings Bank Corp said it agreed to buy <Seashore Bankshares Inc> in an exchange of stock. According to the terms of the deal, it said Seashore's 61,000 shares will be exchanged for 9.8 mln dlrs of New Hampshire Savings stock. It said Seashore Bankshares has assets of about 46 mln dlrs.