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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash Flows From Operating Activities: [Abstract]    
Net income $ 400,712 $ 387,399
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]    
Provision for credit losses 2,000 18,000
Change in fair value of mortgage servicing rights due to market assumption changes 14,634 2,023
Change in the fair value of mortgage servicing rights due to principal payments 20,702 21,508
Net unrealized (gains) losses from derivative contracts 86,876 (123,979)
Share-based compensation 17,456 18,379
Depreciation and amortization 82,692 78,408
Net amortization of discounts and premiums (38,996) (31,633)
Net losses (gains) on financial instruments and other losses (gains), net (15,892) (29,012)
Net loss (gain) on mortgage loans held for sale (6,359) (6,508)
Mortgage loans originated for sale (608,782) (603,963)
Proceeds from sale of mortgage loans held for sale 592,989 572,861
Capitalized mortgage servicing rights (8,975) (10,812)
Charitable contributions to BOKF Foundation 0 13,610
Change in trading and fair value option securities 556,474 55,270
Change in receivables (47,029) 219,583
Change in other assets 55,431 97,074
Change in other liabilities (126,430) 211,240
Net cash provided by (used in) operating activities 977,503 889,448
Cash Flows From Investing Activities: [Abstract]    
Proceeds from maturities or redemptions of investment securities 177,815 172,086
Proceeds from maturities or redemptions of available-for-sale securities 1,618,118 1,531,719
Purchases of available-for-sale securities (2,048,792) (2,807,115)
Proceeds from sales of available-for-sale securities 171,345 839,352
Change in amount receivable on unsettled available-for-sale securities transactions (20,429) 91,132
Loans originated, net of principal collected (720,286) (79,038)
Net proceeds from derivative asset contracts (34,296) (13,870)
Net change in restricted equity securities 157,573 33,764
Proceeds from disposition of assets 22,681 18,029
Purchases of assets (106,117) (124,451)
Net cash provided by (used in) investing activities (782,388) (338,392)
Cash Flows From Financing Activities: [Abstract]    
Net change in demand deposits, transaction deposits and savings accounts 81,320 2,381,483
Net change in time deposits 227,468 825,934
Net change in other borrowed funds (146,702) (3,363,116)
Repayments of Subordinated Debt (132,166) 0
Net payments on derivative liability contracts 6,630 14,294
Net change in derivative margin accounts (11,506) 37,060
Change in amount due on unsettled available-for-sale securities transactions (8,478) (119,332)
Payment, Tax Withholding, Share-Based Payment Arrangement (6,275) (3,700)
Repurchase of common stock (104,776) (89,779)
Dividends paid (109,288) (106,125)
Net cash provided by (used in) financing activities (203,773) (423,281)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total (8,658) 127,775
Cash and cash equivalents at beginning of period 1,434,701 1,348,265
Cash and cash equivalents at end of period 1,426,043 1,476,040
Supplemental Cash Flow Information: [Abstract]    
Cash paid for interest 940,376 1,097,666
Cash paid for taxes 72,959 67,803
Net loans and bank premises transferred to repossessed real estate and other assets 156 440
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period 34,180 12,599
Conveyance of other real estate owned guaranteed by U.S. government agencies 3,168 2,912
Right-of-use assets obtained in exchange for operating lease liabilities $ 4,273 $ 20,100