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Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net interest revenue from external sources $ 280,309 $ 278,104 $ 560,729 $ 539,464
Net interest revenue (expense) from internal sources 0 0 0 0
Net interest revenue 280,309 278,104 560,729 539,464
Provision for credit losses (35,000) 135,321 (60,000) 229,092
Net interest revenue after provision for credit losses 315,309 142,783 620,729 310,372
Other operating revenue 191,446 233,272 368,500 413,594
Other operating expense 291,152 295,966 586,936 564,593
Net direct contribution 215,603 80,089 402,293 159,373
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 215,603 80,089 402,293 159,373
Federal and state income taxes 48,496 15,803 90,878 33,103
Net income 167,107 64,286 311,415 126,270
Net income (loss) attributable to non-controlling interests 686 (407) (1,066) (502)
Net income attributable to BOK Financial Corp. shareholders 166,421 64,693 312,481 126,772
Average assets 50,196,922 49,757,031 50,253,463 47,738,825
Operating Segments [Member] | Commercial [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 151,942 174,314 307,741 376,216
Net interest revenue (expense) from internal sources (21,041) (29,205) (46,835) (79,700)
Net interest revenue 130,901 145,109 260,906 296,516
Provision for credit losses 16,268 13,762 30,253 30,642
Net interest revenue after provision for credit losses 114,633 131,347 230,653 265,874
Other operating revenue 65,269 47,898 111,848 86,118
Other operating expense 71,351 62,933 138,330 123,685
Net direct contribution 108,551 116,312 204,171 228,307
Gain (loss) on financial instruments, net 34 48 67 97
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net 3,565 191 16,302 200
Corporate expense allocations 12,512 5,437 25,246 14,342
Net income before taxes 99,638 111,114 195,294 214,262
Federal and state income taxes 27,006 30,122 52,989 58,295
Net income 72,632 80,992 142,305 155,967
Net income (loss) attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 72,632 80,992 142,305 155,967
Average assets 28,160,594 27,575,652 28,104,137 26,131,814
Operating Segments [Member] | Consumer [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 17,552 18,795 34,238 44,671
Net interest revenue (expense) from internal sources 7,393 20,475 11,681 38,531
Net interest revenue 24,945 39,270 45,919 83,202
Provision for credit losses 425 535 1,561 1,791
Net interest revenue after provision for credit losses 24,520 38,735 44,358 81,411
Other operating revenue 37,714 67,192 89,996 122,254
Other operating expense 52,453 58,249 108,076 112,017
Net direct contribution 9,781 47,678 26,278 91,648
Gain (loss) on financial instruments, net 17,137 7,356 (12,479) 94,120
Change in fair value of mortgage servicing rights (13,041) (761) 20,833 (89,241)
Gain (loss) on repossessed assets, net 0 27 41 40
Corporate expense allocations 11,599 10,692 23,073 21,059
Net income before taxes 2,278 43,608 11,600 75,508
Federal and state income taxes 580 11,107 2,954 19,232
Net income 1,698 32,501 8,646 56,276
Net income (loss) attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 1,698 32,501 8,646 56,276
Average assets 10,087,488 9,920,005 9,922,431 9,885,429
Operating Segments [Member] | Wealth Management [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 52,966 34,359 101,520 48,725
Net interest revenue (expense) from internal sources (673) (7,479) (873) (2,941)
Net interest revenue 52,293 26,880 100,647 45,784
Provision for credit losses (54) (89) (83) (137)
Net interest revenue after provision for credit losses 52,347 26,969 100,730 45,921
Other operating revenue 79,149 106,674 145,272 204,555
Other operating expense 79,429 80,567 157,994 158,759
Net direct contribution 52,067 53,076 88,008 91,717
Gain (loss) on financial instruments, net 0 0 0 7
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 10,343 8,204 20,230 16,469
Net income before taxes 41,724 44,872 67,778 75,255
Federal and state income taxes 10,663 11,478 17,335 19,288
Net income 31,061 33,394 50,443 55,967
Net income (loss) attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 31,061 33,394 50,443 55,967
Average assets 19,201,041 15,721,452 18,924,987 14,222,432
Funds Management and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 57,849 50,636 117,230 69,852
Net interest revenue (expense) from internal sources 14,321 16,209 36,027 44,110
Net interest revenue 72,170 66,845 153,257 113,962
Provision for credit losses (51,639) 121,113 (91,731) 196,796
Net interest revenue after provision for credit losses 123,809 (54,268) 244,988 (82,834)
Other operating revenue 9,314 11,508 21,384 667
Other operating expense 87,919 94,217 182,536 170,132
Net direct contribution 45,204 (136,977) 83,836 (252,299)
Gain (loss) on financial instruments, net (17,171) (7,404) 12,412 (94,224)
Change in fair value of mortgage servicing rights 13,041 761 (20,833) 89,241
Gain (loss) on repossessed assets, net (3,565) (218) (16,343) (240)
Corporate expense allocations (34,454) (24,333) (68,549) (51,870)
Net income before taxes 71,963 (119,505) 127,621 (205,652)
Federal and state income taxes 10,247 (36,904) 17,600 (63,712)
Net income 61,716 (82,601) 110,021 (141,940)
Net income (loss) attributable to non-controlling interests 686 (407) (1,066) (502)
Net income attributable to BOK Financial Corp. shareholders 61,030 (82,194) 111,087 (141,438)
Average assets $ (7,252,201) $ (3,460,078) $ (6,698,092) $ (2,500,850)