OKSB/SFNC:地区性银行Simmons First National下跌5.5%,Southwest Bancorp上涨18%,Simmons First National将以5.64亿美元收购... OKSB/SFNC:地区性银行Simmons First National下跌5.5%,Southwest Bancorp上涨18%, Simmons First National将以5.64亿美元收购Southwest Bancorp。