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Reportable Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
NII (expense) from external sources $ 1,210,758 $ 1,272,180 $ 1,211,380
NII (expense) from internal sources 0 0 0
Net interest and dividend revenue 1,210,758 1,272,180 1,211,380
Provision for credit losses 18,000 46,000 30,000
Net interest income after provision for credit losses 1,192,758 1,226,180 1,181,380
Other operating revenue 839,641 789,949 643,257
Personnel 811,239 766,610 670,918
Non-personnel expense1 554,516 [1] 566,271 [2] 493,562 [3]
Other operating expense 1,365,755 1,332,881 1,164,480
Corporate expense allocations 0 [4] 0 [5] 0 [6]
Net income before taxes 666,644 683,248 660,157
Average assets 50,749,498 48,244,154 47,024,636
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
NII (expense) from external sources 1,115,402 1,268,488 1,017,349
NII (expense) from internal sources 88,969 (9,051) (145,182)
Net interest and dividend revenue 1,204,371 1,259,437 872,167
Provision for credit losses 14,493 19,074 22,811
Net interest income after provision for credit losses 1,189,878 1,240,363 849,356
Other operating revenue 825,268 859,241 688,070
Personnel 551,380 531,908 483,384
Non-personnel expense1 358,551 [1] 347,521 [2] 326,519 [3]
Other operating expense 909,931 879,429 809,903
Corporate expense allocations 182,807 [4] 177,965 [5] 163,379 [6]
Net income before taxes 922,408 1,042,210 564,144
Average assets 40,635,585 38,927,333 37,742,299
Operating Segments [Member] | Commercial [Member]      
Segment Reporting Information [Line Items]      
NII (expense) from external sources 1,078,190 1,178,506 809,982
NII (expense) from internal sources (263,094) (305,107) (159,242)
Net interest and dividend revenue 815,096 873,399 650,740
Provision for credit losses 8,850 13,967 17,726
Net interest income after provision for credit losses 806,246 859,432 633,014
Other operating revenue 222,584 247,001 239,692
Personnel 189,027 191,765 173,309
Non-personnel expense1 116,403 [1] 124,083 [2] 115,934 [3]
Other operating expense 305,430 315,848 289,243
Corporate expense allocations 69,997 [4] 74,999 [5] 67,278 [6]
Net income before taxes 653,403 715,586 516,185
Average assets 21,751,103 21,003,551 19,073,248
Operating Segments [Member] | Consumer [Member]      
Segment Reporting Information [Line Items]      
NII (expense) from external sources 25,946 59,962 69,646
NII (expense) from internal sources 234,101 207,058 30,911
Net interest and dividend revenue 260,047 267,020 100,557
Provision for credit losses 5,827 5,157 5,260
Net interest income after provision for credit losses 254,220 261,863 95,297
Other operating revenue 140,005 105,793 108,873
Personnel 98,667 89,472 87,183
Non-personnel expense1 127,597 [1] 122,642 [2] 122,027 [3]
Other operating expense 226,264 212,114 209,210
Corporate expense allocations 55,737 [4] 48,565 [5] 44,965 [6]
Net income before taxes 112,224 106,977 (50,005)
Average assets 8,112,293 8,040,602 8,789,697
Operating Segments [Member] | Wealth Management [Member]      
Segment Reporting Information [Line Items]      
NII (expense) from external sources 11,266 30,020 137,721
NII (expense) from internal sources 117,962 88,998 (16,851)
Net interest and dividend revenue 129,228 119,018 120,870
Provision for credit losses (184) (50) (175)
Net interest income after provision for credit losses 129,412 119,068 121,045
Other operating revenue 462,679 506,447 339,505
Personnel 263,686 250,671 222,892
Non-personnel expense1 114,551 [1] 100,796 [2] 88,558 [3]
Other operating expense 378,237 351,467 311,450
Corporate expense allocations 57,073 [4] 54,401 [5] 51,136 [6]
Net income before taxes 156,781 219,647 97,964
Average assets 10,772,189 9,883,180 9,879,354
Funds Management and Other [Member]      
Segment Reporting Information [Line Items]      
NII (expense) from external sources 95,356 3,692 194,031
NII (expense) from internal sources (88,969) 9,051 145,182
Net interest and dividend revenue 6,387 12,743 339,213
Provision for credit losses 3,507 26,926 7,189
Net interest income after provision for credit losses 2,880 (14,183) 332,024
Other operating revenue 14,373 (69,292) (44,813)
Personnel 259,859 234,702 187,534
Non-personnel expense1 195,965 [1] 218,750 [2] 167,043 [3]
Other operating expense 455,824 453,452 354,577
Corporate expense allocations (182,807) [4] (177,965) [5] (163,379) [6]
Net income before taxes (255,764) (358,962) 96,013
Average assets $ 10,113,913 $ 9,316,821 $ 9,282,337
[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] 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.
[3] 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.
[4] Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.
[5] Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.
[6] Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.