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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
Summary of Regulatory Capital Levels [Table Text Block]
A summary of regulatory capital minimum requirements and levels follows (dollars in thousands):
Minimum Capital RequirementCapital Conservation BufferMinimum Capital Requirement Including Capital Conservation BufferWell Capitalized Bank RequirementDecember 31, 2020December 31, 2019
Common Equity Tier 1 Capital (to Risk Weighted Assets):
Consolidated4.50%2.50%7.00%N/A$3,881,912 11.95 %$3,608,821 11.39 %
BOKF, NA4.50%N/A4.50%6.50%3,756,950 11.66 %3,414,446 10.90 %
Tier I Capital (to Risk Weighted Assets):
Consolidated6.00%2.50%8.50%N/A$3,881,912 11.95 %$3,608,821 11.39 %
BOKF, NA6.00%N/A6.00%8.00%3,756,950 11.66 %3,414,446 10.90 %
Total Capital (to Risk Weighted Assets):
  
Consolidated
8.00%2.50%10.50%N/A$4,489,110 13.82 %$4,097,087 12.94 %
BOKF, NA
8.00%N/A8.00%10.00%4,153,347 12.89 %3,692,010 11.79 %
Leverage (Tier I Capital to Average Assets):
Consolidated4.00%N/A4.00%N/A$3,881,912 8.28 %$3,608,820 8.40 %
BOKF, NA4.00%N/A4.00%5.00%3,756,950 8.04 %3,414,446 7.98 %
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
Unrealized Gain (Loss) on
Available for Sale SecuritiesEmployee Benefit PlansTotal
Balance, December 31, 2017$(35,385)$(789)$(36,174)
Transition adjustment for net unrealized gains on equity securities
(2,709)— (2,709)
Net change in unrealized gain (loss)(46,941)(1,069)(48,010)
Reclassification adjustments included in earnings:
Loss on available for sale securities, net2,801 — 2,801 
Other comprehensive income (loss), before income taxes
(44,140)(1,069)(45,209)
Federal and state income tax(11,235)(272)(11,507)
Other comprehensive income (loss), net of income taxes(32,905)(797)(33,702)
Balance, December 31, 2018(70,999)(1,586)(72,585)
Net change in unrealized gain (loss)
239,017 2,030 241,047 
Reclassification adjustments included in earnings:
Gain on available for sale securities, net(5,597)— (5,597)
Other comprehensive income (loss), before income taxes
233,420 2,030 235,450 
Federal and state income tax57,425 517 57,942 
Other comprehensive income (loss), net of income taxes175,995 1,513 177,508 
Balance, December 31, 2019104,996 (73)104,923 
Net change in unrealized gain (loss)
312,576 1,220 313,796 
Reclassification adjustments included in earnings:
Gain on available for sale securities, net
(9,910)— (9,910)
Other comprehensive income (loss), before income taxes
302,666 1,220 303,886 
Federal and state income tax72,630 311 72,941 
Other comprehensive income (loss), net of income taxes230,036 909 230,945 
Balance, December 31, 2020$335,032 $836 $335,868