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Consolidated Statements of Earnings (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Interest revenue [Abstract]        
Loans $ 416,935 $ 453,779 $ 1,215,539 $ 1,339,570
Residential mortgage loans held for sale 1,405 1,495 3,726 3,766
Trading securities 72,653 76,419 232,756 219,457
Investment securities 6,536 7,381 20,257 22,774
Available-for-sale securities 133,396 125,490 392,206 362,806
Fair value option securities 1,441 189 2,938 578
Restricted equity securities 6,605 8,426 20,691 26,476
Interest-bearing cash and cash equivalents 5,482 7,131 17,337 21,912
Total interest revenue 644,453 680,310 1,905,450 1,997,339
Interest expense [Abstract]        
Deposits 241,833 271,128 721,348 768,005
Borrowed funds 64,974 98,706 198,367 324,647
Subordinated debentures 0 2,357 3,672 6,975
Total interest expense 306,807 372,191 923,387 1,099,627
Net interest income 337,646 308,119 982,063 897,712
Provision for credit losses 2,000 2,000 2,000 18,000
Net interest income after provision for credit losses 335,646 306,119 980,063 879,712
Total fees and commissions revenue 204,430 202,494 585,876 603,085
Other gains, net 8,264 13,087 15,679 74,731
Gain (loss) on derivatives, net (453) 8,991 14,647 (733)
Gain on fair value option securities, net 630 764 2,067 365
Change in fair value of mortgage servicing rights (2,375) (16,453) (14,634) (2,023)
Gain (loss) on available-for-sale securities, net 213 (691) 213 (45,828)
Total other operating revenue 210,709 208,192 603,848 629,597
Noninterest Expense [Abstract]        
Personnel 226,347 206,821 655,243 600,564
Business promotion 9,960 7,681 27,917 23,909
Charitable contributions to BOKF Foundation 0 0 0 13,610
Professional fees and services 15,137 13,405 43,808 38,746
Net occupancy and equipment 33,040 32,077 98,689 92,615
FDIC and other insurance 7,302 8,186 20,328 24,243
FDIC special assessment (1,209) (1,437) (1,209) 6,207
Data processing and communications 50,062 47,554 147,237 139,249
Printing, postage, and supplies 4,036 3,594 11,742 11,380
Amortization of intangible assets 2,656 2,856 7,964 8,757
Mortgage banking costs 10,668 9,059 25,068 23,946
Other expense 11,771 11,229 35,015 34,873
Total other operating expense 369,770 341,025 1,071,802 1,018,099
Net income before taxes 176,585 173,286 512,109 491,210
Federal and state income taxes 35,714 33,313 111,397 103,811
Net income 140,871 139,973 400,712 387,399
Net income (loss) attributable to non-controlling interests (23) (26) 23 (16)
Net income attributable to BOK Financial Corporation shareholders $ 140,894 $ 139,999 $ 400,689 $ 387,415
Earnings Per Share [Abstract]        
Basic $ 2.22 $ 2.18 $ 6.27 $ 6.01
Diluted $ 2.22 $ 2.18 $ 6.27 $ 6.01
Average shares used in computation: [Abstract]        
Basic 62,840,270 63,489,581 63,196,043 63,830,188
Diluted 62,840,270 63,489,581 63,196,043 63,830,188
Dividends declared per share $ 0.57 $ 0.55 $ 1.71 $ 1.65
Brokerage and trading revenue [Member]        
Total fees and commissions revenue $ 43,239 $ 50,391 $ 112,432 $ 162,587
Transaction card revenue [Member]        
Total fees and commissions revenue 29,463 28,495 86,116 81,234
Fiduciary and asset management revenue [Member]        
Total fees and commissions revenue 63,878 57,384 188,814 170,265
Deposit service charges and fees [Member]        
Total fees and commissions revenue 31,896 30,450 93,490 88,707
Mortgage banking revenue [Member]        
Total fees and commissions revenue 19,764 18,372 58,572 55,967
Other revenue [Member]        
Total fees and commissions revenue $ 16,190 $ 17,402 $ 46,452 $ 44,325