FNBC Bancorp, Ash Flat, Ark., is expanding into the central part of the state by acquiring Augusta-based RiverWind Bancshares. .Financial terms of the deal were not disclosed. The deal is expected to close by the end of the year and grow FNBC into a $1 billion bank.FNBC Bancorp is the bank holding company for FNBC Bank, which has $850 million in assets and branches in north-central and northeast Arkansas and south-central Missouri. RiverWind Bancshares is the holding company of RiverWind Bank, a $170 million community bank with two branches in Searcy and an additional office in Beebe. Bank Advisory Group and Reynolds Bone & Griesbeck PLC were financial advisors to FNBC Bank, while Hunton Andrews Kurth LLP was legal advisor. Stephens Inc. was financial advisor to RiverWind Bank, while Quattlebaum, Grooms & Tull was legal counsel.