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Consolidated Statements of Earnings (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Interest revenue [Abstract]        
Loans $ 193,841 $ 215,438 $ 391,415 $ 458,656
Residential mortgage loans held for sale 1,569 2,140 2,949 3,263
Trading securities 36,655 11,407 72,577 23,167
Investment securities 2,608 3,000 5,334 6,121
Available for sale securities 58,909 68,297 117,517 138,017
Fair value option securities 402 4,110 898 15,818
Restricted equity securities 1,751 1,880 3,110 7,774
Interest-bearing cash and cash equivalents 158 112 332 2,505
Total interest revenue 295,893 306,384 594,132 655,321
Interest expense [Abstract]        
Deposits 8,425 17,745 18,275 63,904
Borrowed funds 3,806 6,996 8,428 44,781
Subordinated debentures 3,353 3,539 6,700 7,172
Total interest expense 15,584 28,280 33,403 115,857
Net interest revenue 280,309 278,104 560,729 539,464
Provision for credit losses (35,000) 135,321 (60,000) 229,092
Net interest revenue after provision for credit losses 315,309 142,783 620,729 310,372
Total fees and commissions 169,415 213,680 331,567 406,404
Other gains (losses), net 16,449 7,347 26,570 (3,391)
Gain (loss) on derivatives, net 18,820 21,885 (8,830) 40,305
Gain (loss) on fair value option securities, net (1,627) (14,459) (3,537) 53,934
Change in fair value of mortgage servicing rights (13,041) (761) 20,833 (89,241)
Gain on available for sale securities, net 1,430 5,580 1,897 5,583
Total other operating revenue 191,446 233,272 368,500 413,594
Other operating expense [Abstract]        
Personnel 172,035 176,235 345,045 332,416
Business promotion 2,744 1,935 4,898 8,150
Charitable contributions to BOKF Foundation 0 3,000 4,000 3,000
Professional fees and services 12,361 12,161 24,341 25,109
Net occupancy and equipment 26,633 30,675 53,295 56,736
Insurance 3,660 5,156 8,280 10,136
Data processing and communications 36,418 32,942 73,885 65,685
Printing, postage and supplies 4,285 3,502 7,725 7,774
Amortization of intangible assets 4,578 5,190 9,385 10,284
Mortgage banking costs 11,126 15,598 25,069 26,143
Other expense 17,312 9,572 31,013 19,160
Total other operating expense 291,152 295,966 586,936 564,593
Net income before taxes 215,603 80,089 402,293 159,373
Federal and state income taxes 48,496 15,803 90,878 33,103
Net income 167,107 64,286 311,415 126,270
Net income (loss) attributable to non-controlling interests 686 (407) (1,066) (502)
Net income attributable to BOK Financial Corporation shareholders $ 166,421 $ 64,693 $ 312,481 $ 126,772
Dividends declared per share $ 0.52 $ 0.51 $ 1.04 $ 1.02
Earnings Per Share [Abstract]        
Basic 2.40 0.92 4.50 1.80
Diluted $ 2.40 $ 0.92 $ 4.50 $ 1.80
Average shares used in computation: [Abstract]        
Basic 68,815,666 69,876,043 68,975,743 69,999,865
Diluted 68,817,442 69,877,467 68,978,798 70,003,817
Brokerage and trading revenue [Member]        
Total fees and commissions $ 29,408 $ 62,022 $ 50,190 $ 112,801
Transaction card revenue [Member]        
Total fees and commissions 24,923 22,940 47,353 44,821
Fiduciary and asset management revenue [Member]        
Total fees and commissions 44,832 41,257 86,154 85,715
Deposit service charges and fees [Member]        
Total fees and commissions 25,861 22,046 50,070 48,176
Mortgage banking revenue [Member]        
Total fees and commissions 21,219 53,936 58,332 91,103
Other revenue [Member]        
Total fees and commissions $ 23,172 $ 11,479 $ 39,468 $ 23,788