LOS ANGELES & BIG BEAR LAKE, Calif.--(BUSINESS WIRE)--PBB Bancorp (OTCQX: PBCA), the holding company and 100% shareholder of Premier Business Bank, and First Mountain Bank (OTCQX: FMBP) announced today that they have entered into a definitive merger agreement whereby PBB Bancorp will acquire First Mountain Bank through the merger of that bank with and into Premier Business Bank. In the merger each share of First Mountain Bank common stock will be exchanged for a combination of $1.05 in cash, su