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Related Parties | 12 Months Ended
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Dec. 31, 2021
Related Party Transactions [Abstract] |
Related Parties [Text Block] | Related Parties In compliance with applicable banking regulations, the Company may extend credit to certain executive officers, directors, principal shareholders and their affiliates (collectively referred to as “related parties”) in the ordinary course of business. The Company’s loans to related parties do not involve more than the normal credit risk. Activity in loans to related parties is summarized as follows (in thousands):
|  | Year Ended December 31,
|  | 2021 |  | 2020
Beginning balance |  | $ | 92,940 |  |  | $ | 75,189 |
Advances |  | 588,252 |  |  | 498,425 |
Payments |  | (583,040) |  |  | (484,958) |
Adjustments 1 |  | (2,933) |  |  | 4,284 |
Ending balance |  | $ | 95,219 |  |  | $ | 92,940 |
1 Adjustments generally consist of changes in status as a related party. As defined by banking regulations, loan commitments and equity investments from the subsidiary banks to a single affiliate may not exceed 10% of unimpaired capital and surplus while loan commitments and equity investments to all affiliates may not exceed 20% of unimpaired capital and surplus. All loans to affiliates must be fully secured by eligible collateral. At December 31, 2021, loan commitments and equity investments were limited to $416 million to a single affiliate and $833 million to all affiliates. The largest loan commitment and equity investment to a single affiliate was $264 million and the aggregate loan commitments and equity investments to all affiliates were $324 million. The largest outstanding amount to a single affiliate at December 31, 2021 was $4.0 million and the total outstanding amounts to all affiliates were $5.0 million. At December 31, 2020, total loan commitments and equity investments to all affiliates were $324 million and the total outstanding amounts to all affiliates were $5.3 million. Certain related parties are customers of the Company for services other than loans, including consumer banking, corporate banking, risk management, wealth management, brokerage and trading, or fiduciary/trust services. The Company engages in transactions with related parties in the ordinary course of business in compliance with applicable regulations. QuikTrip Corporation has entered into a fee sharing agreement with TransFund, BOKF’s electronic funds transfer network (“TransFund”), respecting transactions completed at TransFund automated teller machines placed in QuikTrip locations. Pursuant to this agreement, BOKF paid QuikTrip approximately $10.4 million in 2021, $10.0 million in 2020 and $10.0 million in 2019. A BOK Financial director is Chief Executive Officer, Chairman, and a significant shareholder of QuikTrip Corporation. Cavanal Hill Investment Management, Inc., a wholly-owned subsidiary of BOKF, NA, is the administrator to and investment advisor for the Cavanal Hill Funds (the "Funds"), a diversified, open-ended investment company established as a business trust under the Investment Company Act of 1940 (the "1940 Act"). BOKF, NA is custodian and Cavanal Hill Distributors, Inc. is distributor for the Funds. The Funds’ products are offered to customers, employee benefit plans, trusts and the general public in the ordinary course of business. Approximately 81% of the Funds’ assets of $4.0 billion are held for the Company's clients. A Company executive officer serves on the Funds' board of trustees and officers of BOKF, NA serve as president and secretary of the Funds. A majority of the members of the Funds’ board of trustees are, however, independent of the Company and the Funds are managed by its board of trustees.

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- Definition The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -URI http://asc.fasb.org/topic&trid=2122745 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864 + Details
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