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Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Net interest revenue from external sources $ 352,348 $ 268,411
Net interest revenue (expense) from internal sources 0 0
Net interest revenue 352,348 268,411
Provision for credit losses 16,000 0
Net interest revenue after provision for credit losses 336,348 268,411
Other operating revenue 177,865 87,856
Other operating expense 305,812 277,618
Net direct contribution 208,401 78,649
Gain (loss) on financial instruments, net 0 0
Change in fair value of mortgage servicing rights 0 0
Gain (loss) on repossessed assets, net 0 0
Corporate expense allocations 0 0
Net income before taxes 208,401 78,649
Federal and state income taxes 45,905 16,197
Net income 162,496 62,452
Net income (loss) attributable to non-controlling interests 128 (36)
Net income attributable to BOK Financial Corp. shareholders 162,368 62,488
Average assets 45,982,468 50,561,074
Operating Segments [Member] | Commercial [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 287,646 147,590
Net interest revenue (expense) from internal sources (21,101) (10,579)
Net interest revenue 266,545 137,011
Provision for credit losses 76 5,343
Net interest revenue after provision for credit losses 266,469 131,668
Other operating revenue 56,845 57,427
Other operating expense 73,504 65,114
Net direct contribution 249,810 123,981
Gain (loss) on financial instruments, net (58) (204)
Change in fair value of mortgage servicing rights 0 0
Gain (loss) on repossessed assets, net 859 1,793
Corporate expense allocations 17,729 16,246
Net income before taxes 232,882 109,324
Federal and state income taxes 56,335 26,980
Net income 176,547 82,344
Net income (loss) attributable to non-controlling interests 0 0
Net income attributable to BOK Financial Corp. shareholders 176,547 82,344
Average assets 28,162,934 29,823,905
Operating Segments [Member] | Consumer [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 21,146 16,915
Net interest revenue (expense) from internal sources 88,235 10,292
Net interest revenue 109,381 27,207
Provision for credit losses 1,184 1,112
Net interest revenue after provision for credit losses 108,197 26,095
Other operating revenue 30,610 33,961
Other operating expense 50,198 48,789
Net direct contribution 88,609 11,267
Gain (loss) on financial instruments, net (4,673) (57,895)
Change in fair value of mortgage servicing rights (6,059) 49,110
Gain (loss) on repossessed assets, net 14 45
Corporate expense allocations 11,618 12,080
Net income before taxes 66,273 (9,553)
Federal and state income taxes 15,586 (2,236)
Net income 50,687 (7,317)
Net income (loss) attributable to non-controlling interests 0 0
Net income attributable to BOK Financial Corp. shareholders 50,687 (7,317)
Average assets 9,934,511 10,273,890
Operating Segments [Member] | Wealth Management [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 20,940 56,231
Net interest revenue (expense) from internal sources 33,166 (465)
Net interest revenue 54,106 55,766
Provision for credit losses (24) (71)
Net interest revenue after provision for credit losses 54,130 55,837
Other operating revenue 108,911 25,018
Other operating expense 82,039 74,620
Net direct contribution 81,002 6,235
Gain (loss) on financial instruments, net 0 0
Change in fair value of mortgage servicing rights 0 0
Gain (loss) on repossessed assets, net 0 0
Corporate expense allocations 12,386 12,071
Net income before taxes 68,616 (5,836)
Federal and state income taxes 16,189 (1,315)
Net income 52,427 (4,521)
Net income (loss) attributable to non-controlling interests 0 0
Net income attributable to BOK Financial Corp. shareholders 52,427 (4,521)
Average assets 11,663,096 21,323,795
Funds Management and Other [Member]    
Segment Reporting Information [Line Items]    
Net interest revenue from external sources 22,616 47,675
Net interest revenue (expense) from internal sources (100,300) 752
Net interest revenue (77,684) 48,427
Provision for credit losses 14,764 (6,384)
Net interest revenue after provision for credit losses (92,448) 54,811
Other operating revenue (18,501) (28,550)
Other operating expense 100,071 89,095
Net direct contribution (211,020) (62,834)
Gain (loss) on financial instruments, net 4,731 58,099
Change in fair value of mortgage servicing rights 6,059 (49,110)
Gain (loss) on repossessed assets, net (873) (1,838)
Corporate expense allocations (41,733) (40,397)
Net income before taxes (159,370) (15,286)
Federal and state income taxes (42,205) (7,232)
Net income (117,165) (8,054)
Net income (loss) attributable to non-controlling interests 128 (36)
Net income attributable to BOK Financial Corp. shareholders (117,293) (8,018)
Average assets $ (3,778,073) $ (10,860,516)