Commitments and Contingent Liabilities (Details)	1 Months Ended	12 Months Ended
	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)
Other Commitments [Abstract]
The Net Asset Value of Units in Mutual Funds (per unit)		1.00
Assets Purchased from Mutual Funds Managed		$ 0	$ 0
Minimum Average Cash Balance Required to be Maintained at Federal Reserve by Subsidiary Bank		890,000,000	$ 905,000,000
Misuse of Revenues Pledged to Municipal Bonds [Member] | Judicial Ruling [Member]
Litigation Settlement [Abstract]
Disgorged fees		1,067,721
Litigation Settlement, Expense		$ 600,000
Misuse of Revenues Pledged to Municipal Bonds [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs		2
Bank Participation in Fraudulent Sale of Securities by Principals [Member] | Pending Litigation [Member]
Litigation Settlement [Abstract]
Loss Contingency, Number of Plaintiffs		19
Principal amount of entered judgment against the principal individual and his wife		$ 36,805,051
Pre-judgment interest amount of entered judgment against the principal individual and his wife		10,937,831
Outstanding principal accrued interest and other amounts upon sale of facilities securing payment of the bonds		25,000,000
Bank Breached Various Fiduciary Duties Acting in its Capacity as Trustee of a Trust that was a Co-general Partner of the Partnership | Settled Litigation
Litigation Settlement [Abstract]
Loss Contingency, Damages Sought, Value		$ 60,000,000
Bank Breached Various Fiduciary Duties Acting in its Capacity as Trustee of a Trust that was a Co-general Partner of the Partnership | Settled Litigation | Subsequent Event
Litigation Settlement [Abstract]
Cost to BOKF, NA in excess of the cost of defense	$ 0
Visa Membership [Member]
Loss Contingencies [Line Items]
Number of Visa Class B Shares Owned by Entity (in shares) | shares		252,533
Number of Visa Class A Shares Visa Class B Shares Are Convertible To (in shares) | shares		403,826