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Reportable Segments
 12 Months Ended
Dec. 31, 2024
Segment Reporting [Abstract]  
Reportable Segments [Text Block] Reportable Segments
BOK Financial operates three principal segments: Commercial Banking, Consumer Banking, and Wealth Management, with the remaining operations recorded in Funds Management and Other. Segments are determined based on BOK Financial's organizational structure and services provided. Commercial Banking includes lending, treasury and cash management services, and customer risk management products to small businesses, middle market, and larger commercial customers. Commercial Banking also includes the TransFund EFT network. Consumer Banking includes retail lending and deposit services, lending and deposit services to small business customers served through the consumer branch network, and all mortgage banking activities. Wealth Management provides fiduciary services, private bank services, and investment advisory services in all markets. Insurance services were provided through November 30, 2023 when BOKF Insurance was sold. Wealth Management also underwrites state and municipal securities and engages in brokerage and trading activities.

In addition to its operating segments, BOK Financial has a Funds Management unit. The primary purpose of this unit is to manage overall liquidity needs and interest rate risk. Each segment borrows funds from and provides funds to the Funds Management unit as needed to support their operations. Operating results for Funds Management and Other include the effect of interest rate risk positions and risk management activities, securities gains and losses including impairment charges, the provision for credit losses in excess of net loans charged off, tax planning strategies including the elimination of tax effected activity, and certain executive compensation costs that are not attributed to the segments. 

The CODM for BOK Financial is the chief executive officer. The CODM evaluates the performance of our segments using net income before taxes, which includes the allocation of funds and capital costs and certain indirect allocations. Segment results are tax effected to present revenue from non-taxable activities as if it had been taxable. Additionally, the CODM primarily relies on the spread between interest revenue and interest expense to assess performance and to make resource allocation decisions where the majority of the segment's revenues are from interest. Therefore, interest revenue is presented net of interest expense. The CODM also reviews budget to actual variances monthly when making decisions about the allocation of operating and capital resources to each segment. Credit costs are attributed to the segments based on net loans charged off or recovered. Modifications of management structure or allocation methodologies may result in changes to previously reported segment data; prior periods have been restated on a comparable basis.

The cost of funds borrowed from the Funds Management unit by the operating segments is transfer priced at rates that approximate market rates for funds with similar duration. Market rates are generally based on the applicable wholesale
borrowing rates or interest rate swap rates adjusted for prepayment risk. This method of transfer pricing funds that support assets of the operating segments tends to insulate them from interest rate risk.

The value of funds provided by the segments to the Funds Management unit is based on rates which approximate the wholesale market rates for funds with similar duration and repricing characteristics. Market rates are generally based on a proxy of wholesale borrowing rates or interest rate swap rates. The funds credit formula applied to deposit products with indeterminate maturities is established based on their repricing characteristics reflected in a combination of the short-term wholesale funding rate and a moving average of an intermediate term swap rate, with an appropriate spread applied to both. Shorter duration products are weighted towards the short-term wholesale funding rates and longer duration products are weighted towards intermediate swap rates. The expected duration ranges from 30 days for certain rate sensitive deposits to five years.

Substantially all revenue is from domestic customers. No single external customer accounts for more than 10% of total revenue for the years ended December 31, 2024, 2023, and 2022.

Net loans charged off and provision for credit losses represents net loans charged off or recovered as attributed to the segments. The provision for credit losses in excess of net charge-offs or recoveries is attributed to Funds Management and Other.

Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2024 is as follows (in thousands):
 CommercialConsumerWealth
Management		Segment TotalFunds Management and Other
BOK
Financial
Corporation
Net interest income from external sources$1,078,190 $25,946 $11,266 $1,115,402 $95,356 $1,210,758 
Net interest income (expense) from internal sources(263,094)234,101 117,962 88,969 (88,969)— 
Net interest income815,096 260,047 129,228 1,204,371 6,387 1,210,758 
Net loans charged off and provision for credit losses8,850 5,827 (184)14,493 3,507 18,000 
Net interest income after provision for credit losses806,246 254,220 129,412 1,189,878 2,880 1,192,758 
Other operating revenue
222,584 140,005 462,679 825,268 14,373 839,641 
Personnel expense189,027 98,667 263,686 551,380 259,859 811,239 
Non-personnel expense1
116,403 127,597 114,551 358,551 195,965 554,516 
Total other operating expense305,430 226,264 378,237 909,931 455,824 1,365,755 
Corporate allocations2
69,997 55,737 57,073 182,807 (182,807)— 
Net income before taxes$653,403 $112,224 $156,781 $922,408 $(255,764)$666,644 
Average assets$21,751,103 $8,112,293 $10,772,189 40,635,585 $10,113,913 $50,749,498 
1     Non-personnel expense includes other segment items comprised of Business promotion, Charitable contributions to BOKF Foundation, Professional fees and services, Net occupancy and equipment, FDIC and other insurance, Data processing and communications, Printing, postage, and supplies, Amortization of intangible assets, Mortgage banking costs, and other miscellaneous expenses.
2    Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.
Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2023 is as follows (in thousands):
 CommercialConsumerWealth
Management		Segment TotalFunds Management and Other
BOK
Financial
Corporation
Net interest income from external sources$1,178,506 $59,962 $30,020 $1,268,488 $3,692 $1,272,180 
Net interest income (expense) from internal sources(305,107)207,058 88,998 (9,051)9,051 — 
Net interest income873,399 267,020 119,018 1,259,437 12,743 1,272,180 
Net loans charged off and provision for credit losses13,967 5,157 (50)19,074 26,926 46,000 
Net interest income after provision for credit losses859,432 261,863 119,068 1,240,363 (14,183)1,226,180 
Other operating revenue
247,001 105,793 506,447 859,241 (69,292)789,949 
Personnel expense191,765 89,472 250,671 531,908 234,702 766,610 
Non-personnel expense1
124,083 122,642 100,796 347,521 218,750 566,271 
Total other operating expense315,848 212,114 351,467 879,429 453,452 1,332,881 
Corporate allocations2
74,999 48,565 54,401 177,965 (177,965)— 
Net income before taxes$715,586 $106,977 $219,647 $1,042,210 $(358,962)$683,248 
Average assets$21,003,551 $8,040,602 $9,883,180 38,927,333 $9,316,821 $48,244,154 
1     Non-personnel expense includes other segment items comprised of Business promotion, Charitable contributions to BOKF Foundation, Professional fees and services, Net occupancy and equipment, FDIC and other insurance, Data processing and communications, Printing, postage, and supplies, Amortization of intangible assets, Mortgage banking costs, and other miscellaneous expenses.
2    Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.


Reportable segments reconciliation to the Consolidated Financial Statements for the year ended December 31, 2022 is as follows (in thousands):
 CommercialConsumerWealth
Management		Segment TotalFunds Management and Other
BOK
Financial
Corporation
Net interest income from external sources$809,982 $69,646 $137,721 $1,017,349 $194,031 $1,211,380 
Net interest income (expense) from internal sources(159,242)30,911 (16,851)(145,182)145,182 — 
Net interest income650,740 100,557 120,870 872,167 339,213 1,211,380 
Net loans charged off and provision for credit losses17,726 5,260 (175)22,811 7,189 30,000 
Net interest income after provision for credit losses633,014 95,297 121,045 849,356 332,024 1,181,380 
Other operating revenue
239,692 108,873 339,505 688,070 (44,813)643,257 
Personnel expense173,309 87,183 222,892 483,384 187,534 670,918 
Non-personnel expense1
115,934 122,027 88,558 326,519 167,043 493,562 
Total other operating expense289,243 209,210 311,450 809,903 354,577 1,164,480 
Corporate allocations2
67,278 44,965 51,136 163,379 (163,379)— 
Net income before taxes$516,185 $(50,005)$97,964 $564,144 $96,013 $660,157 
Average assets$19,073,248 $8,789,697 $9,879,354 $37,742,299 $9,282,337 $47,024,636 
1     Non-personnel expense includes other segment items comprised of Business promotion, Charitable contributions to BOKF Foundation, Professional fees and services, Net occupancy and equipment, FDIC and other insurance, Data processing and communications, Printing, postage, and supplies, Amortization of intangible assets, Mortgage banking costs, and other miscellaneous expenses.
2    Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.