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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023December 31, 2022
Common Equity Tier 1 Capital (to Risk Weighted Assets):
Consolidated4.50%2.50%7.00%N/A$4,683,510 12.06 %$4,460,054 11.69 %
BOKF, NA4.50%N/A4.50%6.50%4,370,891 11.37 %4,176,978 11.05 %
Tier I Capital (to Risk Weighted Assets):
Consolidated6.00%2.50%8.50%N/A$4,686,487 12.07 %$4,464,763 11.71 %
BOKF, NA6.00%N/A6.00%8.00%4,370,891 11.37 %4,178,531 11.06 %
Total Capital (to Risk Weighted Assets):
  
Consolidated
8.00%2.50%10.50%N/A$5,110,471 13.16 %$4,830,827 12.67 %
BOKF, NA
8.00%N/A8.00%10.00%4,728,876 12.30 %4,478,559 11.85 %
Leverage (Tier I Capital to Average Assets):
Consolidated4.00%N/A4.00%N/A$4,686,487 9.45 %$4,464,763 9.91 %
BOKF, NA4.00%N/A4.00%5.00%4,370,891 8.86 %4,178,531 9.31 %
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, 2020$335,032 $— $836 $335,868 
Net change in unrealized gain (loss)(343,730)— 2,361 (341,369)
Reclassification adjustments included in earnings:
Gain on available for sale securities, net(3,704)— — (3,704)
Other comprehensive income (loss), before income taxes
(347,434)— 2,361 (345,073)
Federal and state income tax(82,177)— 601 (81,576)
Other comprehensive income (loss), net of income taxes(265,257)— 1,760 (263,497)
Balance, December 31, 202169,775 — 2,596 72,371 
Net change in unrealized gain (loss)
(1,227,414)— — (1,227,414)
Transfer of net unrealized loss from AFS to investment securities267,509 (267,509)— — 
Reclassification adjustments included in earnings:
Interest revenue, Investment securities— 42,514 — 42,514 
Operating expense, Personnel— — (3,483)(3,483)
Loss on available for sale securities, net971 — — 971 
Other comprehensive income (loss), before income taxes
(958,934)(224,995)(3,483)(1,187,412)
Federal and state income tax(224,541)(52,658)(887)(278,086)
Other comprehensive income (loss), net of income taxes(734,393)(172,337)(2,596)(909,326)
Balance, December 31, 2022(664,618)(172,337)— (836,955)
Net change in unrealized gain (loss)
218,293 — — 218,293 
Reclassification adjustments included in earnings:
Interest revenue, Investment securities— 60,394 — 60,394 
Loss on available for sale securities, net30,636 — — 30,636 
Other comprehensive income (loss), before income taxes
248,929 60,394 — 309,323 
Federal and state income tax57,523 13,945 — 71,468 
Other comprehensive income (loss), net of income taxes191,406 46,449 — 237,855 
Balance, December 31, 2023$(473,212)$(125,888)$— $(599,100)