Arthur, N.D. (Mar 23, 2023) – First Financial Corporation, holding company of BankNorth announced today that it has agreed to terms for the purchase of HSB Financial Corp., the holding company of Harwood State Bank (HSB). Pending approval by the appropriate regulatory agencies, the transaction is expected to close later this summer. Following the close of the transaction, HSB will continue to serve its customers at its branch in Harwood, N.D. BankNorth is headquartered in Arthur, N.D. and currently has…