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Acquisition Acquisition	6 Months Ended
Acquisition Acquisition	Jun. 30, 2018
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	On June 18, 2018, the Company announced the signing of a definitive merger agreement with CoBiz Financial Inc. CoBiz is headquartered in Denver with a presence in Colorado and Arizona and has approximately $3.8 billion in assets. Upon completion of the merger, CoBiz shareholders will receive 0.17 shares of BOK Financial common stock and $5.70 in cash for each share of CoBiz common stock. The merger is subject to customary closing conditions including regulatory approval. On May 1, 2018, the Company acquired a majority voting interest in Switchgrass Holdings, LLC, a restaurant franchise owner and operator, pursuant to merchant banking regulations and restrictions. The purchase price for this acquisition was $14 million. The preliminary purchase price allocation included $6.1 million of goodwill.