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Employee Benefits
 12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Employee Benefits [Text Block] Employee Benefits
BOK Financial sponsored a defined benefit cash balance Pension Plan for all employees who satisfied certain age and service requirements. As of February 28, 2022, the Pension Plan was terminated and was subsequently liquidated in accordance with the standard plan termination requirements of Title IV of ERISA and Section 12.3 of the Plan. Each participant was permitted to elect to receive payment of their accrued benefit in the form of a lump sum or an immediate annuity. Those participants who did not elect a lump sum had their accrued benefit annuitized in the form of an irrevocable commitment from an insurance company selected to fund the remaining plan benefits in connection with the plan termination. All benefits were paid and all obligations settled prior to December 31, 2022. Prior to termination, BOK Financial recognized the funded status of its employee benefit plans. Adjustments required to recognize the Pension Plan's net funded status were made through accumulated other comprehensive income, net of deferred income taxes. In 2022, as a result of the termination, BOK Financial paid out $15.5 million in benefits to plan participants to settle all obligations. At the beginning of 2023, the remaining balance in the Plan of $19.1 million was transferred to the Thrift Plan to cover a portion of the employer contributions for 2022.

The projected benefit obligation and fair value of plan assets, respectively, were $20 million and $39 million at December 31, 2021. The net periodic benefit credit was $2.2 million for December 31, 2021 and $1.3 million for December 31, 2020, and is included in Personnel expense in the Consolidated Statements of Earnings.

Employee contributions to the Thrift Plan are eligible for Company matching equal to 6% of base compensation, as defined in the plan. The Company-provided matching contribution rates range from 50% for employees with less than 4 years of service to 200% for employees with 15 or more years of service. An additional 5% of the annual employer matching contribution was added to each contributing participant's account for 2022 who were employed on the last day of the plan year. Additionally, a maximum Company-provided, non-elective annual contribution of up to $750 per participant is provided for employees whose annual base compensation is less than $40,000. Participants may direct investments in their accounts to a variety of options, including a BOK Financial common stock fund and Cavanal Hill funds. Employer contributions, which are invested in accordance with the participant’s investment options, vest over five years. Thrift Plan expenses were $31.7 million for 2022, $30.5 million for 2021 and $29.9 million for 2020.