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Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Net interest income from external sources $ 296,021 $ 322,261 $ 589,593 $ 674,609
Net interest income (expense) from internal sources 0 0 0 0
Net interest income 296,021 322,261 589,593 674,609
Net loans charged off and provisions for credit losses 8,000 17,000 16,000 33,000
Net interest income after provision for credit losses 288,021 305,261 573,593 641,609
Other operating revenue 259,704 209,049 421,405 386,914
Other operating expense 336,690 318,673 677,074 624,485
Net direct contribution 211,035 195,637 317,924 404,038
Gain (loss) on financial instruments, net 0 0 0 0
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 0 0 0 0
Corporate expense allocations 0 0 0 0
Net income before taxes 211,035 195,637 317,924 404,038
Federal and state income taxes 47,303 44,001 70,498 89,906
Net income 163,732 151,636 247,426 314,132
Net income attributable to non-controlling interests 19 328 10 456
Net income attributable to BOK Financial Corp. shareholders 163,713 151,308 247,416 313,676
Average assets 51,195,199 47,908,107 50,611,385 46,950,607
Operating Segments [Member] | Commercial [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 283,328 299,712 566,084 587,970
Net interest income (expense) from internal sources (79,593) (77,975) (158,354) (139,134)
Net interest income 203,735 221,737 407,730 448,836
Net loans charged off and provisions for credit losses 6,134 6,000 10,294 6,076
Net interest income after provision for credit losses 197,601 215,737 397,436 442,760
Other operating revenue 54,536 68,828 104,542 125,673
Other operating expense 76,114 77,559 146,209 150,693
Net direct contribution 176,023 207,006 355,769 417,740
Gain (loss) on financial instruments, net 168 231 335 173
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 0 408 0 1,267
Corporate expense allocations 17,381 21,404 35,778 39,122
Net income before taxes 158,810 186,241 320,326 380,058
Federal and state income taxes 39,247 45,462 78,966 92,610
Net income 119,563 140,779 241,360 287,448
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 119,563 140,779 241,360 287,448
Average assets 30,305,613 28,170,869 30,056,215 28,166,923
Operating Segments [Member] | Consumer [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 6,192 17,828 13,542 38,974
Net interest income (expense) from internal sources 58,972 50,260 115,757 96,324
Net interest income 65,164 68,088 129,299 135,298
Net loans charged off and provisions for credit losses 1,247 1,129 3,055 2,313
Net interest income after provision for credit losses 63,917 66,959 126,244 132,985
Other operating revenue 36,252 32,277 72,459 62,887
Other operating expense 55,128 52,340 108,575 102,538
Net direct contribution 45,041 46,896 90,128 93,334
Gain (loss) on financial instruments, net (3,577) (10,257) (13,240) (14,930)
Change in fair value of mortgage servicing rights 3,453 9,261 14,430 3,202
Gain (loss) on repossessed assets, net 9 0 116 14
Corporate expense allocations 13,392 12,318 27,564 23,940
Net income before taxes 31,534 33,582 63,870 57,680
Federal and state income taxes 7,417 7,898 15,022 13,566
Net income 24,117 25,684 48,848 44,114
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 24,117 25,684 48,848 44,114
Average assets 9,630,470 9,597,723 9,511,225 9,765,186
Operating Segments [Member] | Wealth Management [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 2,612 4,415 9,611 25,355
Net interest income (expense) from internal sources 26,889 29,426 48,288 44,087
Net interest income 29,501 33,841 57,899 69,442
Net loans charged off and provisions for credit losses 0 (45) (15) (69)
Net interest income after provision for credit losses 29,501 33,886 57,914 69,511
Other operating revenue 113,208 123,043 231,912 231,954
Other operating expense 90,214 84,587 189,502 166,342
Net direct contribution 52,495 72,342 100,324 135,123
Gain (loss) on financial instruments, net 0 0 0 0
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 0 0 0 0
Corporate expense allocations 16,484 12,784 31,263 25,310
Net income before taxes 36,011 59,558 69,061 109,813
Federal and state income taxes 8,514 14,056 16,336 25,927
Net income 27,497 45,502 52,725 83,886
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 27,497 45,502 52,725 83,886
Average assets 16,452,098 12,949,258 16,105,713 12,309,730
Funds Management and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 3,889 306 356 22,310
Net interest income (expense) from internal sources (6,268) (1,711) (5,691) (1,277)
Net interest income (2,379) (1,405) (5,335) 21,033
Net loans charged off and provisions for credit losses 619 9,916 2,666 24,680
Net interest income after provision for credit losses (2,998) (11,321) (8,001) (3,647)
Other operating revenue 55,708 (15,099) 12,492 (33,600)
Other operating expense 115,234 104,187 232,788 204,912
Net direct contribution (62,524) (130,607) (228,297) (242,159)
Gain (loss) on financial instruments, net 3,409 10,026 12,905 14,757
Change in fair value of mortgage servicing rights (3,453) (9,261) (14,430) (3,202)
Gain (loss) on repossessed assets, net (9) (408) (116) (1,281)
Corporate expense allocations (47,257) (46,506) (94,605) (88,372)
Net income before taxes (15,320) (83,744) (135,333) (143,513)
Federal and state income taxes (7,875) (23,415) (39,826) (42,197)
Net income (7,445) (60,329) (95,507) (101,316)
Net income attributable to non-controlling interests 19 328 10 456
Net income attributable to BOK Financial Corp. shareholders (7,464) (60,657) (95,517) (101,772)
Average assets $ (5,192,982) $ (2,809,743) $ (5,061,768) $ (3,291,232)