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Reportable Segments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | $ 1,112,879 | $ 984,867 | $ 841,701
Net interest revenue (expense) from internal sources | 0 | 0 | 0
Net interest and dividend revenue | 1,112,879 | 984,867 | 841,701
Provision for credit losses | 44,000 | 8,000 | (7,000)
Net interest and dividend revenue after provision for credit losses | 1,068,879 | 976,867 | 848,701
Other operating revenue | 694,370 | 616,784 | 695,094
Other operating expense | 1,132,381 | 1,028,166 | 1,025,517
Net direct contribution | 630,868 | 565,485 | 518,278
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 | 630,868 | 565,485 | 518,278
Federal and state income taxes | 130,183 | 119,061 | 182,593
Net income | 500,685 | 446,424 | 335,685
Net income (loss) attributable to Non-controlling interests | (73) | 778 | 1,041
Net income attributable to BOK Financial Corp. shareholders | 500,758 | 445,646 | 334,644
Average assets | 42,094,347 | 34,937,530 | 32,947,494
Operating Segments [Member] | Commercial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | 919,148 | 726,855 | 618,325
Net interest revenue (expense) from internal sources | (242,907) | (159,954) | (92,055)
Net interest and dividend revenue | 676,241 | 566,901 | 526,270
Provision for credit losses | 39,011 | 30,358 | 13,877
Net interest and dividend revenue after provision for credit losses | 637,230 | 536,543 | 512,393
Other operating revenue | 170,412 | 162,701 | 208,404
Other operating expense | 252,459 | 202,095 | 235,793
Net direct contribution | 555,183 | 497,149 | 485,004
Gain (loss) on financial instruments, net | 106 | 26 | 52
Change in fair value of mortgage servicing rights | 0 | 0 | 0
Gain (loss) on repossessed assets, net | 331 | (6,532) | (2,681)
Corporate expense allocations | 43,055 | 36,670 | 28,060
Net income before taxes | 512,565 | 453,973 | 454,315
Federal and state income taxes | 137,759 | 120,458 | 186,518
Net income | 374,806 | 333,515 | 267,797
Net income (loss) attributable to Non-controlling interests | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 374,806 | 333,515 | 267,797
Average assets | 22,807,589 | 18,432,035 | 17,766,027
Operating Segments [Member] | Consumer [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | 99,679 | 83,231 | 84,286
Net interest revenue (expense) from internal sources | 95,775 | 73,448 | 53,916
Net interest and dividend revenue | 195,454 | 156,679 | 138,202
Provision for credit losses | 6,271 | 5,143 | 4,786
Net interest and dividend revenue after provision for credit losses | 189,183 | 151,536 | 133,416
Other operating revenue | 187,500 | 178,123 | 184,878
Other operating expense | 230,916 | 231,075 | 241,805
Net direct contribution | 145,767 | 98,584 | 76,489
Gain (loss) on financial instruments, net | 30,375 | (25,021) | (2,052)
Change in fair value of mortgage servicing rights | (53,517) | 4,668 | 172
Gain (loss) on repossessed assets, net | 496 | 247 | 223
Corporate expense allocations | 47,169 | 44,398 | 49,344
Net income before taxes | 75,952 | 34,080 | 25,488
Federal and state income taxes | 19,346 | 8,681 | 9,915
Net income | 56,606 | 25,399 | 15,573
Net income (loss) attributable to Non-controlling interests | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 56,606 | 25,399 | 15,573
Average assets | 9,301,341 | 8,303,263 | 8,544,117
Operating Segments [Member] | Wealth Management [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | 61,277 | 81,528 | 45,024
Net interest revenue (expense) from internal sources | 38,815 | 31,480 | 38,344
Net interest and dividend revenue | 100,092 | 113,008 | 83,368
Provision for credit losses | (308) | (288) | (696)
Net interest and dividend revenue after provision for credit losses | 100,400 | 113,296 | 84,064
Other operating revenue | 341,389 | 296,369 | 301,434
Other operating expense | 277,267 | 257,650 | 254,495
Net direct contribution | 164,522 | 152,015 | 131,003
Gain (loss) on financial instruments, net | 2 | 7 | 0
Change in fair value of mortgage servicing rights | 0 | 0 | 0
Gain (loss) on repossessed assets, net | 0 | 0 | 387
Corporate expense allocations | 36,239 | 35,920 | 32,693
Net income before taxes | 128,285 | 116,102 | 98,697
Federal and state income taxes | 32,954 | 30,075 | 38,848
Net income | 95,331 | 86,027 | 59,849
Net income (loss) attributable to Non-controlling interests | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 95,331 | 86,027 | 59,849
Average assets | 10,204,426 | 8,447,784 | 7,072,622
Funds Management and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest and dividend revenue from external sources | 32,775 | 93,253 | 94,066
Net interest revenue (expense) from internal sources | 108,317 | 55,026 | (205)
Net interest and dividend revenue | 141,092 | 148,279 | 93,861
Provision for credit losses | (974) | (27,213) | (24,967)
Net interest and dividend revenue after provision for credit losses | 142,066 | 175,492 | 118,828
Other operating revenue | (4,931) | (20,409) | 378
Other operating expense | 371,739 | 337,346 | 293,424
Net direct contribution | (234,604) | (182,263) | (174,218)
Gain (loss) on financial instruments, net | (30,483) | 24,988 | 2,000
Change in fair value of mortgage servicing rights | 53,517 | (4,668) | (172)
Gain (loss) on repossessed assets, net | (827) | 6,285 | 2,071
Corporate expense allocations | (126,463) | (116,988) | (110,097)
Net income before taxes | (85,934) | (38,670) | (60,222)
Federal and state income taxes | (59,876) | (40,153) | (52,688)
Net income | (26,058) | 1,483 | (7,534)
Net income (loss) attributable to Non-controlling interests | (73) | 778 | 1,041
Net income attributable to BOK Financial Corp. shareholders | (25,985) | 705 | (8,575)
Average assets | $ (219,009) | $ (245,552) | $ (435,272)

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