FNBC Bank President and CEO Chad Hudson says the Ash Flat based bank’s planned acquisition of Riverwind Bank of Augusta, near Searcy, is a natural fit and will bring FNBC’s assets to about $1 billion. FNBC Bank announced late Tuesday it will acquire Riverwind Bank in a transaction expected to be completed by the end of the year, pending regulatory approval. Financial terms were not disclosed. FNBC Bancorp Inc., the holding company for FNBC Bank,…