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Consolidated Statements of Earnings - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest and dividend revenue [Abstract]      
Loans $ 889,507 $ 1,123,791 $ 891,587
Residential mortgage loans held for sale 6,397 7,105 8,123
Trading securities 67,689 61,595 57,531
Investment securities 11,943 13,426 14,775
Available for sale securities 261,196 254,031 197,317
Fair value option securities 18,475 32,936 15,205
Restricted equity securities 10,963 26,860 21,555
Interest-bearing cash and cash equivalents 2,830 12,214 22,333
Total interest revenue 1,269,000 1,531,958 1,228,426
Interest Expense [Abstract]      
Deposits 89,996 175,538 95,517
Borrowed funds 56,616 228,428 138,215
Subordinated debentures 13,944 15,113 9,827
Total interest expense 160,556 419,079 243,559
Net interest and dividend revenue 1,108,444 1,112,879 984,867
Provision for credit losses 222,592 44,000 8,000
Net interest and dividend revenue after provision for credit losses 885,852 1,068,879 976,867
Total fees and commissions 810,320 702,201 643,176
Other gains (losses), net 7,675 9,351 (2,265)
Gain (loss) on derivatives, net 42,320 14,951 (422)
Gain (loss) on fair value option securities, net 53,248 15,787 (25,572)
Change in fair value of mortgage servicing rights (79,524) (53,517) 4,668
Gain (loss) on available for sale securities, net 9,910 5,597 (2,801)
Total other operating revenue 843,949 694,370 616,784
Other operating expense [Abstract]      
Personnel 688,474 660,565 583,131
Business promotion 14,511 35,662 30,523
Charitable contributions to BOKF Foundation 9,000 3,000 2,846
Professional fees and services 53,437 54,861 59,099
Net occupancy and equipment 112,722 110,275 97,981
Insurance 19,990 20,906 23,318
Data processing and communications 135,497 124,983 114,796
Printing, postage and supplies 15,061 16,517 17,169
Net losses and operating expenses of repossessed assets 10,709 6,707 17,052
Amortization of intangible assets 20,443 20,618 9,620
Mortgage banking costs 56,711 50,685 46,298
Other expense 29,382 27,602 26,333
Total other operating expense 1,165,937 1,132,381 1,028,166
Net income before taxes 563,864 630,868 565,485
Federal and state income taxes 128,793 130,183 119,061
Net income 435,071 500,685 446,424
Net income (loss) attributable to Non-controlling interests 41 (73) 778
Net income attributable to BOK Financial Corporation shareholders $ 435,030 $ 500,758 $ 445,646
Earnings per share: [Abstract]      
Basic (in dollars per share) $ 6.19 $ 7.03 $ 6.63
Diluted (in dollars per share) $ 6.19 $ 7.03 $ 6.63
Average shares used in computation: [Abstract]      
Basic (in shares) 69,840,977 70,787,700 66,628,640
Diluted (in shares) 69,844,172 70,802,612 66,662,273
Dividends declared per share (in dollars per share) $ 2.05 $ 2.01 $ 1.90
Brokerage and trading revenue [Member]      
Total fees and commissions $ 221,833 $ 159,826 $ 108,323
Transaction card revenue [Member]      
Total fees and commissions 90,182 87,216 84,025
Fiduciary and asset management revenue [Member]      
Total fees and commissions 167,445 177,025 184,703
Deposit service charges and fees [Member]      
Total fees and commissions 96,805 112,485 112,153
Mortgage banking revenue [Member]      
Total fees and commissions 182,360 107,541 97,787
Other revenue [Member]      
Total fees and commissions $ 51,695 $ 58,108 $ 56,185