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Consolidated Statements of Earnings (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Interest revenue [Abstract]        
Loans $ 191,206 $ 215,977 $ 582,621 $ 674,633
Residential mortgage loans held for sale 1,274 1,585 4,223 4,848
Trading securities 38,941 8,723 111,518 31,890
Investment securities 2,580 2,939 7,914 9,060
Available for sale securities 57,310 62,369 174,827 200,386
Fair value option securities 342 1,986 1,240 17,804
Restricted equity securities 1,565 913 4,675 8,687
Interest-bearing cash and cash equivalents 245 167 577 2,672
Total interest revenue 293,463 294,659 887,595 949,980
Interest expense [Abstract]        
Deposits 7,665 14,658 25,940 78,562
Borrowed funds 3,066 4,856 11,494 49,637
Subordinated debentures 2,505 3,395 9,205 10,567
Total interest expense 13,236 22,909 46,639 138,766
Net interest revenue 280,227 271,750 840,956 811,214
Provision for credit losses (23,000) 0 (83,000) 229,092
Net interest revenue after provision for credit losses 303,227 271,750 923,956 582,122
Total fees and commissions 190,421 222,865 521,988 629,269
Other gains (losses), net 31,091 2,044 57,661 (1,347)
Gain (loss) on derivatives, net (5,760) 2,354 (14,590) 42,659
Gain (loss) on fair value option securities, net (120) (754) (3,657) 53,180
Change in fair value of mortgage servicing rights 12,945 3,441 33,778 (85,800)
Gain on available for sale securities, net 1,255 (12) 3,152 5,571
Total other operating revenue 229,832 229,938 598,332 643,532
Other operating expense [Abstract]        
Personnel 175,863 179,860 520,908 512,276
Business promotion 4,939 2,633 9,837 10,783
Charitable contributions to BOKF Foundation 0 0 4,000 3,000
Professional fees and services 12,436 14,074 36,777 39,183
Net occupancy and equipment 28,395 28,111 81,690 84,847
Insurance 3,712 5,848 11,992 15,984
Data processing and communications 38,371 34,751 112,256 100,436
Printing, postage and supplies 3,558 3,482 11,283 11,256
Amortization of intangible assets 4,488 5,071 13,873 15,355
Mortgage banking costs 8,962 15,803 34,031 41,946
Other expense 10,553 7,411 41,566 26,571
Total other operating expense 291,277 297,044 878,213 861,637
Net income before taxes 241,782 204,644 644,075 364,017
Federal and state income taxes 54,061 50,552 144,939 83,655
Net income 187,721 154,092 499,136 280,362
Net income (loss) attributable to non-controlling interests (601) 58 (1,667) (444)
Net income attributable to BOK Financial Corporation shareholders $ 188,322 $ 154,034 $ 500,803 $ 280,806
Dividends declared per share $ 0.52 $ 0.51 $ 1.56 $ 1.53
Earnings Per Share [Abstract]        
Basic 2.74 2.19 7.23 3.99
Diluted $ 2.74 $ 2.19 $ 7.23 $ 3.99
Average shares used in computation: [Abstract]        
Basic 68,359,125 69,877,866 68,768,044 69,958,944
Diluted 68,360,871 69,879,290 68,770,663 69,962,053
Brokerage and trading revenue [Member]        
Total fees and commissions $ 47,930 $ 69,526 $ 98,120 $ 182,327
Transaction card revenue [Member]        
Total fees and commissions 24,632 23,465 71,985 68,286
Fiduciary and asset management revenue [Member]        
Total fees and commissions 45,248 39,931 131,402 125,646
Deposit service charges and fees [Member]        
Total fees and commissions 27,429 24,286 77,499 72,462
Mortgage banking revenue [Member]        
Total fees and commissions 26,286 51,959 84,618 143,062
Other revenue [Member]        
Total fees and commissions $ 18,896 $ 13,698 $ 58,364 $ 37,486