...Ratings Affirmed, Rating Outlook Stable: The affirmation of BOK Financial Corporation's (BOKF or the company) ratings in May 2021 reflected the company's strong company profile, deposit franchise in key markets and revenue diversification that differentiates BOKF from its peers. The revision of the Rating Outlook to Stable from Negative reflected increased confidence in a U.S. recovery, reducing the likelihood of the downside scenario contemplated at the time of Fitch's Negative Rating Outlook revision in May 2020. Business Model Differentiates from Peers: BOKF's business model and franchise are ratings strengths, supporting a rating above peers. In addition to the core traditional banking franchise, the company offers trust, insurance, brokerage and investment banking services, which contribute to fee income. Brokerage and mortgage origination volumes in 2020 and into 2021 offset much of the negative impact of a narrow net interest margin (NIM) on earnings. Solid Asset Quality: BOKF's...