 In 1986, the bank received $130 million from the Federal Deposit Insurance Corporation (FDIC) and reported a net loss of $139 million.On June 7, 1991, when the bank had just under $2 billion in assets, it was acquired by George Kaiser for $61 million in a sale facilitated by the FDIC.Under Kaiser's ownership, BOK began an aggressive expansion effort with the strategy to locate in growing markets near Oklahoma.