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Reportable Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Net interest and dividend revenue from external sources $ 1,108,444 $ 1,112,879 $ 984,867
Net interest revenue (expense) from internal sources 0 0 0
Net interest and dividend revenue 1,108,444 1,112,879 984,867
Provision for credit losses 222,592 44,000 8,000
Net interest and dividend revenue after provision for credit losses 885,852 1,068,879 976,867
Other operating revenue 843,949 694,370 616,784
Other operating expense 1,165,937 1,132,381 1,028,166
Net direct contribution 563,864 630,868 565,485
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 563,864 630,868 565,485
Federal and state income taxes 128,793 130,183 119,061
Net income 435,071 500,685 446,424
Net income (loss) attributable to Non-controlling interests 41 (73) 778
Net income attributable to BOK Financial Corp. shareholders 435,030 500,758 445,646
Average assets 48,704,390 42,094,347 34,937,530
Operating Segments [Member] | Commercial [Member]      
Segment Reporting Information [Line Items]      
Net interest and dividend revenue from external sources 714,932 919,148 726,855
Net interest revenue (expense) from internal sources (126,444) (242,907) (159,954)
Net interest and dividend revenue 588,488 676,241 566,901
Provision for credit losses 69,475 39,011 30,358
Net interest and dividend revenue after provision for credit losses 519,013 637,230 536,543
Other operating revenue 187,361 170,412 162,701
Other operating expense 258,903 252,459 202,095
Net direct contribution 447,471 555,183 497,149
Gain (loss) on financial instruments, net 193 106 26
Change in fair value of mortgage servicing rights 0 0 0
Gain (loss) on repossessed assets, net (2,677) 331 (6,532)
Corporate expense allocations 24,862 43,055 36,670
Net income before taxes 420,125 512,565 453,973
Federal and state income taxes 114,120 137,759 120,458
Net income 306,005 374,806 333,515
Net income (loss) attributable to Non-controlling interests 0 0 0
Net income attributable to BOK Financial Corp. shareholders 306,005 374,806 333,515
Average assets 26,994,075 22,807,589 18,432,035
Operating Segments [Member] | Consumer [Member]      
Segment Reporting Information [Line Items]      
Net interest and dividend revenue from external sources 78,004 99,679 83,231
Net interest revenue (expense) from internal sources 69,000 95,775 73,448
Net interest and dividend revenue 147,004 195,454 156,679
Provision for credit losses 2,805 6,271 5,143
Net interest and dividend revenue after provision for credit losses 144,199 189,183 151,536
Other operating revenue 243,719 187,500 178,123
Other operating expense 233,425 230,916 231,075
Net direct contribution 154,493 145,767 98,584
Gain (loss) on financial instruments, net 95,344 30,375 (25,021)
Change in fair value of mortgage servicing rights (79,524) (53,517) 4,668
Gain (loss) on repossessed assets, net 276 496 247
Corporate expense allocations 42,638 47,169 44,398
Net income before taxes 127,951 75,952 34,080
Federal and state income taxes 32,591 19,346 8,681
Net income 95,360 56,606 25,399
Net income (loss) attributable to Non-controlling interests 0 0 0
Net income attributable to BOK Financial Corp. shareholders 95,360 56,606 25,399
Average assets 9,842,125 9,301,341 8,303,263
Operating Segments [Member] | Wealth Management [Member]      
Segment Reporting Information [Line Items]      
Net interest and dividend revenue from external sources 130,818 61,277 81,528
Net interest revenue (expense) from internal sources (13,528) 38,815 31,480
Net interest and dividend revenue 117,290 100,092 113,008
Provision for credit losses (209) (308) (288)
Net interest and dividend revenue after provision for credit losses 117,499 100,400 113,296
Other operating revenue 398,834 341,389 296,369
Other operating expense 325,608 277,267 257,650
Net direct contribution 190,725 164,522 152,015
Gain (loss) on financial instruments, net 4 2 7
Change in fair value of mortgage servicing rights 0 0 0
Gain (loss) on repossessed assets, net 0 0 0
Corporate expense allocations 35,331 36,239 35,920
Net income before taxes 155,398 128,285 116,102
Federal and state income taxes 39,770 32,954 30,075
Net income 115,628 95,331 86,027
Net income (loss) attributable to Non-controlling interests 0 0 0
Net income attributable to BOK Financial Corp. shareholders 115,628 95,331 86,027
Average assets 15,695,646 10,204,426 8,447,784
Funds Management and Other [Member]      
Segment Reporting Information [Line Items]      
Net interest and dividend revenue from external sources 184,690 32,775 93,253
Net interest revenue (expense) from internal sources 70,972 108,317 55,026
Net interest and dividend revenue 255,662 141,092 148,279
Provision for credit losses 150,521 (974) (27,213)
Net interest and dividend revenue after provision for credit losses 105,141 142,066 175,492
Other operating revenue 14,035 (4,931) (20,409)
Other operating expense 348,001 371,739 337,346
Net direct contribution (228,825) (234,604) (182,263)
Gain (loss) on financial instruments, net (95,541) (30,483) 24,988
Change in fair value of mortgage servicing rights 79,524 53,517 (4,668)
Gain (loss) on repossessed assets, net 2,401 (827) 6,285
Corporate expense allocations (102,831) (126,463) (116,988)
Net income before taxes (139,610) (85,934) (38,670)
Federal and state income taxes (57,688) (59,876) (40,153)
Net income (81,922) (26,058) 1,483
Net income (loss) attributable to Non-controlling interests 41 (73) 778
Net income attributable to BOK Financial Corp. shareholders (81,963) (25,985) 705
Average assets $ (3,827,456) $ (219,009) $ (245,552)