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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash Flows From Operating Activities: [Abstract]    
Net income $ 247,426 $ 314,132
Adjustments to reconcile net income to net cash used in operating activities: [Abstract]    
Provision for credit losses 16,000 33,000
Change in fair value of mortgage servicing rights due to market assumption changes (14,430) (3,202)
Change in the fair value of mortgage servicing rights due to principal payments 13,459 13,829
Net unrealized (gains) losses from derivative contracts (108,051) (25,310)
Share-based compensation 10,062 11,114
Depreciation and amortization 52,076 56,583
Net amortization of discounts and premiums (20,111) (8,733)
Net losses (gains) on financial instruments and other losses (gains), net (16,615) (11,617)
Net loss (gain) on mortgage loans held for sale (4,613) 2,153
Mortgage loans originated for sale (379,214) (353,409)
Proceeds from sale of mortgage loans held for sale 334,578 332,944
Capitalized mortgage servicing rights (6,970) (6,603)
Charitable contributions to BOKF Foundation 13,610 0
Change in trading and fair value option securities (17,671) (893,843)
Change in receivables 264,352 (82,491)
Change in other assets 69,808 44,365
Change in other liabilities 189,069 17,318
Net cash provided by (used in) operating activities 642,765 (559,770)
Cash Flows From Investing Activities: [Abstract]    
Proceeds from maturities or redemptions of investment securities 113,747 140,043
Proceeds from maturities or redemptions of available for sale securities 940,442 656,703
Purchases of investment securities 0 2,504
Purchases of available for sale securities (2,244,168) (1,266,764)
Proceeds from sales of available for sale securities 737,830 135,489
Change in amount receivable on unsettled available for sale securities transactions 95,997 (10,548)
Loans originated, net of principal collected (651,931) (678,700)
Net proceeds from derivative asset contracts 15,651 156,205
Net change in restricted equity securities (52,110) (30,435)
Proceeds from disposition of assets 12,600 29,136
Purchases of assets (87,269) (97,875)
Net cash provided by (used in) investing activities (1,119,211) (969,250)
Cash Flows From Financing Activities: [Abstract]    
Net change in demand deposits, transaction deposits and savings accounts 1,770,030 (2,430,397)
Net change in time deposits 451,913 1,244,535
Net change in other borrowed funds (1,490,267) 2,208,867
Net payments on derivative liability contracts (20,415) (151,457)
Net change in derivative margin accounts (188,326) 707,266
Change in amount due on unsettled available for sale securities transactions (154,203) 139,688
Issuance of common and treasury stock, net (3,630) (4,695)
Repurchase of common stock (89,779) (67,066)
Dividends paid (70,979) (72,107)
Net cash provided by (used in) financing activities 204,344 1,574,634
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total (272,102) 45,614
Cash and cash equivalents at beginning of period 1,348,265 1,401,716
Cash and cash equivalents at end of period 1,076,163 1,447,330
Supplemental Cash Flow Information: [Abstract]    
Cash paid for interest 742,708 401,187
Cash paid for taxes 39,008 123,821
Net loans and bank premises transferred to repossessed real estate and other assets 77 225
Residential mortgage loans guaranteed by U.S. government agencies that became eligible for repurchase during the period 8,263 7,768
Conveyance of other real estate owned guaranteed by U.S. government agencies 1,840 2,569
Right-of-use assets obtained in exchange for operating lease liabilities $ 18,236 $ 64,899