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Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | $ 1,272,180 | $ 1,211,380 | $ 1,118,033
Net interest revenue (expense) from internal sources | 0 | 0 | 0
Net interest and dividend revenue | 1,272,180 | 1,211,380 | 1,118,033
Provision for credit losses | 46,000 | 30,000 | (100,000)
Net interest and dividend revenue after provision for credit losses | 1,226,180 | 1,181,380 | 1,218,033
Other operating revenue | 789,949 | 643,257 | 755,775
Other operating expense | 1,332,881 | 1,164,480 | 1,177,708
Net direct contribution | 683,248 | 660,157 | 796,100
Gain (loss) on financial instruments, net | 0 | 0 | 0
Change in fair value of mortgage servicing rights | 0 | 0 | 0
Gain (loss) on repossessed assets, net | 0 | 0 | 0
Corporate expense allocations | 0 | 0 | 0
Net income before taxes | 683,248 | 660,157 | 796,100
Federal and state income taxes | 152,115 | 139,864 | 179,775
Net income | 531,133 | 520,293 | 616,325
Net income (loss) attributable to Non-controlling interests | 387 | 20 | (1,796)
Net income attributable to BOK Financial Corp. shareholders | 530,746 | 520,273 | 618,121
Average assets | 48,244,154 | 47,024,636 | 50,151,703
Operating Segments [Member] | Commercial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | 1,179,336 | 818,213 | 606,902
Net interest revenue (expense) from internal sources | (146,965) | (73,764) | (71,167)
Net interest and dividend revenue | 1,032,371 | 744,449 | 535,735
Provision for credit losses | 13,967 | 17,726 | 31,128
Net interest and dividend revenue after provision for credit losses | 1,018,404 | 726,723 | 504,607
Other operating revenue | 246,225 | 241,594 | 262,402
Other operating expense | 312,794 | 289,243 | 279,571
Net direct contribution | 951,835 | 679,074 | 487,438
Gain (loss) on financial instruments, net | 378 | 1 | 154
Change in fair value of mortgage servicing rights | 0 | 0 | 0
Gain (loss) on repossessed assets, net | 398 | (1,903) | 13,001
Corporate expense allocations | 74,976 | 67,278 | 54,146
Net income before taxes | 877,635 | 609,894 | 446,447
Federal and state income taxes | 213,174 | 148,358 | 119,934
Net income | 664,461 | 461,536 | 326,513
Net income (loss) attributable to Non-controlling interests | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 664,461 | 461,536 | 326,513
Average assets | 28,630,716 | 29,084,957 | 28,536,881
Operating Segments [Member] | Consumer [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | 59,985 | 69,646 | 67,856
Net interest revenue (expense) from internal sources | 389,791 | 88,603 | 35,671
Net interest and dividend revenue | 449,776 | 158,249 | 103,527
Provision for credit losses | 5,157 | 5,260 | 4,009
Net interest and dividend revenue after provision for credit losses | 444,619 | 152,989 | 99,518
Other operating revenue | 123,678 | 121,819 | 173,341
Other operating expense | 212,114 | 209,210 | 209,596
Net direct contribution | 356,183 | 65,598 | 63,263
Gain (loss) on financial instruments, net | (14,806) | (93,346) | (21,871)
Change in fair value of mortgage servicing rights | (3,115) | 80,261 | 41,637
Gain (loss) on repossessed assets, net | 36 | 139 | 85
Corporate expense allocations | 48,565 | 44,965 | 46,010
Net income before taxes | 289,733 | 7,687 | 37,104
Federal and state income taxes | 68,143 | 1,798 | 9,461
Net income | 221,590 | 5,889 | 27,643
Net income (loss) attributable to Non-controlling interests | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 221,590 | 5,889 | 27,643
Average assets | 9,561,512 | 10,230,437 | 10,029,687
Operating Segments [Member] | Wealth Management [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | 39,198 | 155,974 | 214,458
Net interest revenue (expense) from internal sources | 142,340 | 5,623 | (386)
Net interest and dividend revenue | 181,538 | 161,597 | 214,072
Provision for credit losses | (50) | (175) | (223)
Net interest and dividend revenue after provision for credit losses | 181,588 | 161,772 | 214,295
Other operating revenue | 506,447 | 339,501 | 298,962
Other operating expense | 352,540 | 312,377 | 320,726
Net direct contribution | 335,495 | 188,896 | 192,531
Gain (loss) on financial instruments, net | 0 | 4 | 0
Change in fair value of mortgage servicing rights | 0 | 0 | 0
Gain (loss) on repossessed assets, net | 0 | 0 | 0
Corporate expense allocations | 53,463 | 50,241 | 40,341
Net income before taxes | 282,032 | 138,659 | 152,190
Federal and state income taxes | 66,549 | 32,639 | 38,944
Net income | 215,483 | 106,020 | 113,246
Net income (loss) attributable to Non-controlling interests | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 215,483 | 106,020 | 113,246
Average assets | 13,570,153 | 16,209,684 | 19,425,475
Funds Management and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | (6,339) | 167,547 | 228,817
Net interest revenue (expense) from internal sources | (385,166) | (20,462) | 35,882
Net interest and dividend revenue | (391,505) | 147,085 | 264,699
Provision for credit losses | 26,926 | 7,189 | (134,914)
Net interest and dividend revenue after provision for credit losses | (418,431) | 139,896 | 399,613
Other operating revenue | (86,401) | (59,657) | 21,070
Other operating expense | 455,433 | 353,650 | 367,815
Net direct contribution | (960,265) | (273,411) | 52,868
Gain (loss) on financial instruments, net | 14,428 | 93,341 | 21,717
Change in fair value of mortgage servicing rights | 3,115 | (80,261) | (41,637)
Gain (loss) on repossessed assets, net | (434) | 1,764 | (13,086)
Corporate expense allocations | (177,004) | (162,484) | (140,497)
Net income before taxes | (766,152) | (96,083) | 160,359
Federal and state income taxes | (195,751) | (42,931) | 11,436
Net income | (570,401) | (53,152) | 148,923
Net income (loss) attributable to Non-controlling interests | 387 | 20 | (1,796)
Net income attributable to BOK Financial Corp. shareholders | (570,788) | (53,172) | 150,719
Average assets | $ (3,518,227) | $ (8,500,442) | $ (7,840,340)

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