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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator: [Abstract]        
Net income attributable to BOK Financial Corp. shareholders $ 166,421 $ 64,693 $ 312,481 $ 126,772
Less: Earnings allocated to participating securities 1,170 397 2,107 740
Numerator for basic earnings per share – income available to common shareholders 165,251 64,296 310,374 126,032
Effect of reallocating undistributed earnings of participating securities 1 0 0 0
Numerator for diluted earnings per share – income available to common shareholders $ 165,252 $ 64,296 $ 310,374 $ 126,032
Denominator: [Abstract]        
Weighted average shares outstanding (in shares) 69,302,245 70,307,606 69,442,239 70,410,707
Less: Participating securities included in weighted average shares (in shares) 486,579 431,563 466,496 410,842
Denominator for basic earnings per common share (in shares) 68,815,666 69,876,043 68,975,743 69,999,865
Dilutive effect of employee stock compensation plans (in shares) 1,776 1,424 3,055 3,952
Denominator for diluted earnings per common share (in shares) 68,817,442 69,877,467 68,978,798 70,003,817
Basic earnings per share $ 2.40 $ 0.92 $ 4.50 $ 1.80
Diluted earnings per share $ 2.40 $ 0.92 $ 4.50 $ 1.80
Excludes employee stock options with exercise prices greater than current market price. 0 22,238 0 0