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Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Net interest income from external sources $ 308,119 $ 300,896 $ 897,712 $ 975,505
Net interest income (expense) from internal sources 0 0 0 0
Net interest income 308,119 300,896 897,712 975,505
Net loans charged off and provisions for credit losses 2,000 7,000 18,000 40,000
Net interest income after provision for credit losses 306,119 293,896 879,712 935,505
Other operating revenue 208,192 198,152 629,597 585,066
Other operating expense 341,025 324,313 1,018,099 948,798
Net direct contribution 173,286 167,735 491,210 571,773
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 173,286 167,735 491,210 571,773
Federal and state income taxes 33,313 33,256 103,811 123,162
Net income 139,973 134,479 387,399 448,611
Net income attributable to non-controlling interests (26) (16) (16) 440
Net income attributable to BOK Financial Corp. shareholders 139,999 134,495 387,415 448,171
Average assets 51,157,035 49,319,552 50,794,596 47,748,933
Operating Segments [Member] | Commercial [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 277,777 298,313 843,882 886,283
Net interest income (expense) from internal sources (70,167) (84,170) (228,521) (223,305)
Net interest income 207,610 214,143 615,361 662,978
Net loans charged off and provisions for credit losses (1,329) 4,904 8,965 10,980
Net interest income after provision for credit losses 208,939 209,239 606,396 651,998
Other operating revenue 59,320 59,153 163,862 184,826
Other operating expense 78,387 83,256 224,596 233,949
Net direct contribution 189,872 185,136 545,662 602,875
Gain (loss) on financial instruments, net 162 (11) 497 162
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 0 (268) 0 999
Corporate expense allocations 17,371 17,838 53,149 56,960
Net income before taxes 172,663 167,019 493,010 547,076
Federal and state income taxes 42,809 41,081 121,780 133,691
Net income 129,854 125,938 371,230 413,385
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 129,854 125,938 371,230 413,385
Average assets 30,657,285 28,867,129 30,258,034 28,402,890
Operating Segments [Member] | Consumer [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 5,955 11,386 19,497 50,360
Net interest income (expense) from internal sources 59,308 54,992 175,065 151,315
Net interest income 65,263 66,378 194,562 201,675
Net loans charged off and provisions for credit losses 1,779 (73) 4,834 2,240
Net interest income after provision for credit losses 63,484 66,451 189,728 199,435
Other operating revenue 36,699 30,716 109,158 93,603
Other operating expense 57,779 54,497 166,354 157,035
Net direct contribution 42,404 42,670 132,532 136,003
Gain (loss) on financial instruments, net 12,121 (9,183) (1,119) (24,113)
Change in fair value of mortgage servicing rights (16,453) 8,039 (2,023) 11,241
Gain (loss) on repossessed assets, net 0 11 116 25
Corporate expense allocations 13,298 11,920 40,862 35,860
Net income before taxes 24,774 29,617 88,644 87,296
Federal and state income taxes 5,826 6,966 20,848 20,532
Net income 18,948 22,651 67,796 66,764
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 18,948 22,651 67,796 66,764
Average assets 9,804,990 9,379,478 9,609,862 9,635,204
Operating Segments [Member] | Wealth Management [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 10,640 7,622 20,251 32,977
Net interest income (expense) from internal sources 22,545 15,045 70,833 59,131
Net interest income 33,185 22,667 91,084 92,108
Net loans charged off and provisions for credit losses (159) 9 (174) (60)
Net interest income after provision for credit losses 33,344 22,658 91,258 92,168
Other operating revenue 112,457 123,614 344,369 355,568
Other operating expense 93,539 89,108 283,041 255,450
Net direct contribution 52,262 57,164 152,586 192,286
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 13,458 14,562 44,721 39,871
Net income before taxes 38,804 42,602 107,865 152,415
Federal and state income taxes 9,188 10,083 25,524 36,010
Net income 29,616 32,519 82,341 116,405
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 29,616 32,519 82,341 116,405
Average assets 16,344,623 14,740,641 16,185,931 13,128,925
Funds Management and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest income from external sources 13,747 (16,425) 14,082 5,885
Net interest income (expense) from internal sources (11,686) 14,133 (17,377) 12,859
Net interest income 2,061 (2,292) (3,295) 18,744
Net loans charged off and provisions for credit losses 1,709 2,160 4,375 26,840
Net interest income after provision for credit losses 352 (4,452) (7,670) (8,096)
Other operating revenue (284) (15,331) 12,208 (48,931)
Other operating expense 111,320 97,452 344,108 302,364
Net direct contribution (111,252) (117,235) (339,570) (359,391)
Gain (loss) on financial instruments, net (12,283) 9,194 622 23,951
Change in fair value of mortgage servicing rights 16,453 (8,039) 2,023 (11,241)
Gain (loss) on repossessed assets, net 0 257 (116) (1,024)
Corporate expense allocations (44,127) (44,320) (138,732) (132,691)
Net income before taxes (62,955) (71,503) (198,309) (215,014)
Federal and state income taxes (24,510) (24,874) (64,341) (67,071)
Net income (38,445) (46,629) (133,968) (147,943)
Net income attributable to non-controlling interests (26) (16) (16) 440
Net income attributable to BOK Financial Corp. shareholders (38,419) (46,613) (133,952) (148,383)
Average assets $ (5,649,863) $ (3,667,696) $ (5,259,231) $ (3,418,086)