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Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net interest revenue from external sources | $ 238,562 | $ 205,204 | $ 458,298 | $ 406,386
Net interest revenue (expense) from internal sources | 0 | 0 | 0 | 0
Net interest revenue | 238,562 | 205,204 | 458,298 | 406,386
Provision for credit losses | 0 | 0 | (5,000) | 0
Net interest revenue after provision for credit losses | 238,562 | 205,204 | 463,298 | 406,386
Other operating revenue | 156,399 | 182,252 | 312,388 | 352,548
Other operating expense | 246,476 | 250,885 | 490,906 | 495,596
Net direct contribution | 148,485 | 136,571 | 284,780 | 263,338
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 | 148,485 | 136,571 | 284,780 | 263,338
Federal and state income taxes | 33,330 | 47,705 | 64,278 | 85,808
Net income | 115,155 | 88,866 | 220,502 | 177,530
Net income attributable to non-controlling interests | 783 | 719 | 568 | 1,027
Net income attributable to BOK Financial Corp. shareholders | 114,372 | 88,147 | 219,934 | 176,503
Average assets | 33,906,035 | 32,368,571 | 33,815,994 | 32,660,160
Operating Segments [Member] | Commercial [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest revenue from external sources | 182,127 | 154,377 | 342,541 | 301,753
Net interest revenue (expense) from internal sources | (37,102) | (21,715) | (65,445) | (39,831)
Net interest revenue | 145,025 | 132,662 | 277,096 | 261,922
Provision for credit losses | 10,108 | 1,228 | 10,735 | (236)
Net interest revenue after provision for credit losses | 134,917 | 131,434 | 266,361 | 262,158
Other operating revenue | 43,047 | 56,353 | 82,722 | 103,198
Other operating expense | 47,483 | 59,511 | 93,950 | 112,416
Net direct contribution | 130,481 | 128,276 | 255,133 | 252,940
Gain (loss) on financial instruments, net | 9 | 3 | 16 | 41
Change in fair value of mortgage servicing rights | 0 | 0 | 0 | 0
Gain (loss) on repossessed assets, net | (67) | 1,403 | (4,232) | 1,398
Corporate expense allocations | 11,269 | 8,955 | 23,776 | 17,674
Net income before taxes | 119,154 | 120,727 | 227,141 | 236,705
Federal and state income taxes | 31,577 | 49,382 | 60,319 | 96,949
Net income | 87,577 | 71,345 | 166,822 | 139,756
Net income attributable to non-controlling interests | 0 | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 87,577 | 71,345 | 166,822 | 139,756
Average assets | 18,072,155 | 17,791,671 | 17,933,756 | 17,716,738
Operating Segments [Member] | Consumer [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest revenue from external sources | 21,746 | 20,756 | 43,499 | 39,348
Net interest revenue (expense) from internal sources | 17,548 | 13,447 | 32,772 | 25,864
Net interest revenue | 39,294 | 34,203 | 76,271 | 65,212
Provision for credit losses | 1,139 | 926 | 2,440 | 2,199
Net interest revenue after provision for credit losses | 38,155 | 33,277 | 73,831 | 63,013
Other operating revenue | 46,320 | 50,744 | 91,269 | 95,879
Other operating expense | 55,906 | 55,125 | 105,760 | 107,991
Net direct contribution | 28,569 | 28,896 | 59,340 | 50,901
Gain (loss) on financial instruments, net | (6,411) | 5,224 | (29,672) | 3,557
Change in fair value of mortgage servicing rights | 1,723 | (6,943) | 22,929 | (5,087)
Gain (loss) on repossessed assets, net | 174 | 98 | 66 | (39)
Corporate expense allocations | 15,867 | 16,912 | 31,897 | 33,658
Net income before taxes | 8,188 | 10,363 | 20,766 | 15,674
Federal and state income taxes | 2,086 | 4,031 | 5,288 | 6,097
Net income | 6,102 | 6,332 | 15,478 | 9,577
Net income attributable to non-controlling interests | 0 | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 6,102 | 6,332 | 15,478 | 9,577
Average assets | 8,353,558 | 8,441,831 | 8,410,513 | 8,360,022
Operating Segments [Member] | Wealth Management [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest revenue from external sources | 18,754 | 10,475 | 34,161 | 21,960
Net interest revenue (expense) from internal sources | 10,232 | 10,325 | 20,164 | 19,181
Net interest revenue | 28,986 | 20,800 | 54,325 | 41,141
Provision for credit losses | (105) | (92) | (153) | (53)
Net interest revenue after provision for credit losses | 29,091 | 20,892 | 54,478 | 41,194
Other operating revenue | 70,642 | 75,569 | 145,409 | 149,727
Other operating expense | 61,491 | 60,616 | 124,295 | 121,025
Net direct contribution | 38,242 | 35,845 | 75,592 | 69,896
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 | 11,142 | 9,947 | 22,097 | 20,619
Net income before taxes | 27,100 | 25,898 | 53,495 | 49,277
Federal and state income taxes | 6,981 | 10,209 | 13,767 | 19,429
Net income | 20,119 | 15,689 | 39,728 | 29,848
Net income attributable to non-controlling interests | 0 | 0 | 0 | 0
Net income attributable to BOK Financial Corp. shareholders | 20,119 | 15,689 | 39,728 | 29,848
Average assets | 8,495,557 | 6,960,872 | 8,296,780 | 6,960,872
Funds Management and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net interest revenue from external sources | 15,935 | 19,596 | 38,097 | 43,325
Net interest revenue (expense) from internal sources | 9,322 | (2,057) | 12,509 | (5,214)
Net interest revenue | 25,257 | 17,539 | 50,606 | 38,111
Provision for credit losses | (11,142) | (2,062) | (18,022) | (1,910)
Net interest revenue after provision for credit losses | 36,399 | 19,601 | 68,628 | 40,021
Other operating revenue | (3,610) | (414) | (7,012) | 3,744
Other operating expense | 81,596 | 75,633 | 166,901 | 154,164
Net direct contribution | (48,807) | (56,446) | (105,285) | (110,399)
Gain (loss) on financial instruments, net | 6,402 | (5,227) | 29,656 | (3,598)
Change in fair value of mortgage servicing rights | (1,723) | 6,943 | (22,929) | 5,087
Gain (loss) on repossessed assets, net | (107) | (1,501) | 4,166 | (1,359)
Corporate expense allocations | (38,278) | (35,814) | (77,770) | (71,951)
Net income before taxes | (5,957) | (20,417) | (16,622) | (38,318)
Federal and state income taxes | (7,314) | (15,917) | (15,096) | (36,667)
Net income | 1,357 | (4,500) | (1,526) | (1,651)
Net income attributable to non-controlling interests | 783 | 719 | 568 | 1,027
Net income attributable to BOK Financial Corp. shareholders | 574 | (5,219) | (2,094) | (2,678)
Average assets | $ (1,015,235) | $ (825,803) | $ (825,055) | $ (377,472)

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