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Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Net interest revenue from external sources $ 240,883 $ 218,452 $ 699,181 $ 624,838
Net interest revenue (expense) from internal sources 0 0 0 0
Net interest revenue 240,883 218,452 699,181 624,838
Provision for credit losses 4,000 0 (1,000) 0
Net interest revenue after provision for credit losses 236,883 218,452 700,181 624,838
Other operating revenue 167,941 175,710 480,329 528,258
Other operating expense 252,617 265,934 743,523 761,530
Net direct contribution 152,207 128,228 436,987 391,566
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 152,207 128,228 436,987 391,566
Federal and state income taxes 34,662 42,438 98,940 128,246
Net income 117,545 85,790 338,047 263,320
Net income attributable to non-controlling interests 289 141 857 1,168
Net income attributable to BOK Financial Corp. shareholders 117,256 85,649 337,190 262,152
Average assets 33,695,817 33,008,170 33,775,495 32,777,438
Operating Segments [Member] | Commercial [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 187,417 160,572 529,958 462,325
Net interest revenue (expense) from internal sources (42,270) (25,460) (107,715) (65,291)
Net interest revenue 145,147 135,112 422,243 397,034
Provision for credit losses 8,047 3,217 18,781 2,982
Net interest revenue after provision for credit losses 137,100 131,895 403,462 394,052
Other operating revenue 40,522 54,670 123,244 157,868
Other operating expense 49,136 57,345 143,085 169,761
Net direct contribution 128,486 129,220 383,621 382,159
Gain (loss) on financial instruments, net (3) 4 13 46
Change in fair value of mortgage servicing rights 0 0 0 0
Gain (loss) on repossessed assets, net (1,869) (4,126) (6,102) (2,728)
Corporate expense allocations 11,027 8,733 34,802 26,407
Net income before taxes 115,587 116,365 342,730 353,070
Federal and state income taxes 30,623 47,755 90,943 144,704
Net income 84,964 68,610 251,787 208,366
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 84,964 68,610 251,787 208,366
Average assets 18,499,979 17,780,494 18,124,571 17,738,224
Operating Segments [Member] | Consumer [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 21,075 21,965 64,574 61,313
Net interest revenue (expense) from internal sources 19,039 13,981 51,811 39,845
Net interest revenue 40,114 35,946 116,385 101,158
Provision for credit losses 1,451 1,316 3,890 3,515
Net interest revenue after provision for credit losses 38,663 34,630 112,495 97,643
Other operating revenue 44,023 44,968 135,292 140,847
Other operating expense 53,187 56,147 158,947 164,138
Net direct contribution 29,499 23,451 88,840 74,352
Gain (loss) on financial instruments, net (7,228) 1,686 (36,901) 5,242
Change in fair value of mortgage servicing rights 5,972 (639) 28,901 (5,726)
Gain (loss) on repossessed assets, net (87) 292 (21) 253
Corporate expense allocations 15,863 16,920 47,760 50,577
Net income before taxes 12,293 7,870 33,059 23,544
Federal and state income taxes 3,131 3,061 8,421 9,159
Net income 9,162 4,809 24,638 14,385
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 9,162 4,809 24,638 14,385
Average assets 8,323,542 8,683,998 8,381,204 8,469,201
Operating Segments [Member] | Wealth Management [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 23,131 11,170 57,612 33,130
Net interest revenue (expense) from internal sources 6,267 9,604 26,431 28,784
Net interest revenue 29,398 20,774 84,043 61,914
Provision for credit losses (84) (623) (236) (676)
Net interest revenue after provision for credit losses 29,482 21,397 84,279 62,590
Other operating revenue 83,357 75,707 228,766 225,434
Other operating expense 62,255 61,792 186,549 182,816
Net direct contribution 50,584 35,312 126,496 105,208
Gain (loss) on financial instruments, net 7 0 7 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 11,126 9,819 33,223 30,438
Net income before taxes 39,465 25,493 93,280 74,770
Federal and state income taxes 10,134 10,021 23,982 29,450
Net income 29,331 15,472 69,298 45,320
Net income attributable to non-controlling interests 0 0 0 0
Net income attributable to BOK Financial Corp. shareholders 29,331 15,472 69,298 45,320
Average assets 8,498,363 6,992,021 8,364,712 6,971,369
Funds Management and Other [Member]        
Segment Reporting Information [Line Items]        
Net interest revenue from external sources 9,260 24,745 47,037 68,070
Net interest revenue (expense) from internal sources 16,964 1,875 29,473 (3,338)
Net interest revenue 26,224 26,620 76,510 64,732
Provision for credit losses (5,414) (3,910) (23,435) (5,821)
Net interest revenue after provision for credit losses 31,638 30,530 99,945 70,553
Other operating revenue 39 365 (6,973) 4,109
Other operating expense 88,039 90,650 254,942 244,815
Net direct contribution (56,362) (59,755) (161,970) (170,153)
Gain (loss) on financial instruments, net 7,224 (1,690) 36,881 (5,288)
Change in fair value of mortgage servicing rights (5,972) 639 (28,901) 5,726
Gain (loss) on repossessed assets, net 1,956 3,834 6,123 2,475
Corporate expense allocations (38,016) (35,472) (115,785) (107,422)
Net income before taxes (15,138) (21,500) (32,082) (59,818)
Federal and state income taxes (9,226) (18,399) (24,406) (55,067)
Net income (5,912) (3,101) (7,676) (4,751)
Net income attributable to non-controlling interests 289 141 857 1,168
Net income attributable to BOK Financial Corp. shareholders (6,201) (3,242) (8,533) (5,919)
Average assets $ (1,626,067) $ (448,343) $ (1,094,992) $ (401,356)