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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022December 31, 2021
Common Equity Tier 1 Capital (to Risk Weighted Assets):
Consolidated4.50%2.50%7.00%N/A$4,460,054 11.69 %$4,230,626 12.24 %
BOKF, NA4.50%N/A4.50%6.50%4,176,978 11.05 %3,869,454 11.27 %
Tier I Capital (to Risk Weighted Assets):
Consolidated6.00%2.50%8.50%N/A$4,464,763 11.71 %$4,235,265 12.25 %
BOKF, NA6.00%N/A6.00%8.00%4,178,531 11.06 %3,871,457 11.28 %
Total Capital (to Risk Weighted Assets):
  
Consolidated
8.00%2.50%10.50%N/A$4,830,826 12.67 %$4,594,787 13.29 %
BOKF, NA
8.00%N/A8.00%10.00%4,478,559 11.85 %4,164,940 12.13 %
Leverage (Tier I Capital to Average Assets):
Consolidated4.00%N/A4.00%N/A$4,464,763 9.91 %$4,235,265 8.55 %
BOKF, NA4.00%N/A4.00%5.00%4,178,531 9.31 %3,871,457 7.84 %
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 SecuritiesInvestment Securities Transferred from AFSEmployee Benefit PlansTotal
Balance, December 31, 2019$104,996 $— $(73)$104,923 
Net change in unrealized gain (loss)312,576 — 1,220 313,796 
Reclassification adjustments included in earnings:
Gain on available for sale securities, net(9,910)— — (9,910)
Other comprehensive income (loss), before income taxes
302,666 — 1,220 303,886 
Federal and state income tax72,630 — 311 72,941 
Other comprehensive income (loss), net of income taxes230,036 — 909 230,945 
Balance, December 31, 2020335,032 — 836 335,868 
Net change in unrealized gain (loss)
(343,730)— 2,361 (341,369)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net(3,704)— — (3,704)
Other comprehensive income (loss), before income taxes
(347,434)— 2,361 (345,073)
Federal and state income tax(82,177)— 601 (81,576)
Other comprehensive income (loss), net of income taxes(265,257)— 1,760 (263,497)
Balance, December 31, 202169,775 — 2,596 72,371 
Net change in unrealized gain (loss)
(1,227,414)— — (1,227,414)
Transfer of net unrealized loss from AFS to investment securities267,509 (267,509)— — 
Reclassification adjustments included in earnings:
Interest revenue, Investment securities— 42,514 — 42,514 
Operating expense, Personnel— — (3,483)(3,483)
Loss on available for sale securities, net971 — — 971 
Other comprehensive income (loss), before income taxes
(958,934)(224,995)(3,483)(1,187,412)
Federal and state income tax(224,541)(52,658)(887)(278,086)
Other comprehensive income (loss), net of income taxes(734,393)(172,337)(2,596)(909,326)
Balance, December 31, 2022$(664,618)$(172,337)$— $(836,955)