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Related Parties Related Parties (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Directors and Senior Management [Member]
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance		$ 95,219	$ 92,940
Advances		731,664	588,252
Payments		(770,808)	(583,040)
Adjustments	[1]	(1,596)	(2,933)
Ending balance		54,479	95,219	$ 92,940
Director [Member]
Loan Commitments and Equity Investments [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party		$ 10,700	10,400	$ 10,000
Executive Officer [Member]
Loan Commitments and Equity Investments [Abstract]
Percentage of investment funds' assets held by clients		79.00%
Assets Held in Cavanal Hill Funds		$ 3,900,000
Subsidiaries [Member] | BOKF, NA [Member] | Affiliated Entity [Member]
Loan Commitments and Equity Investments [Abstract]
Maximum percentage of unimpaired capital on loan commitments and equity investments to a single affiliate (in hundredths)		10.00%
Maximum percentage of unimpaired capital on loan commitments and equity investments to all affiliates (in hundredths)		20.00%
Maximum loan commitments and equity investments to a single affiliate		$ 448,000
Maximum loan commitments and equity investments to all affiliates		896,000
Largest loan commitment and equity investment to a single affiliate		284,000
Aggregate loan commitment and equity investment to all affiliates		344,000	324,000
Outstanding amounts to all affiliates		3,900	$ 5,000
Largest amount outstanding to a single affiliate		$ 3,900
[1] Adjustments generally consist of changes in status as a related party.

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- Definition

The aggregate amount of largest loan commitment and equity investment to all affiliates.

+ References

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The amount of assets held in investment funds.

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Largest amount outstanding to a single affiliate at balance sheet date

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The amount of largest loan commitment and equity investment to a single affiliate.

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Loan Commitments and Equity Investments [Abstract]

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Reflects the amount of adjustments made with related parties in the form of loans and lease receivables.

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The amount of maximum loan commitments and equity investments to all affiliates.

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The amount of maximum loan commitments and equity investments to a single affiliate.

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The maximum percentage of unimpaired capital on loan commitments and equity investments to all affiliates.

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- Definition

The percentage of an investment fund's assets help by a company's clients.

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For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

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Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

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Amount of cash inflow from related parties which reduce the amount of loans and leases receivable due from related parties.

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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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