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Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Net interest income from external sources $ 316,251 $ 293,572
Net interest income (expense) from internal sources 0 0
Net interest income 316,251 293,572
Provision for credit losses 0 8,000
Net interest income after provision for credit losses 316,251 285,572
Noninterest Income 186,041 161,701
Personnel 214,185 202,653
Other Cost and Expense, Operating 133,344 [1] 137,731 [2]
Noninterest Expense 347,529 340,384
Corporate expense allocations 0 [3] 0 [4]
Net income before taxes 154,763 106,889
Average assets 50,986,903 50,027,572
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Net interest income from external sources 254,105 290,236
Net interest income (expense) from internal sources 25,907 6,292
Net interest income 280,012 296,528
Provision for credit losses 1,657 5,953
Net interest income after provision for credit losses 278,355 290,575
Noninterest Income 190,915 206,505
Personnel 141,133 134,104
Other Cost and Expense, Operating 86,603 [1] 88,726 [2]
Noninterest Expense 227,736 222,830
Corporate expense allocations 46,703 [3] 47,348 [4]
Net income before taxes 194,831 226,902
Average assets 40,970,001 40,090,272
Operating Segments [Member] | Commercial [Member]    
Segment Reporting Information [Line Items]    
Net interest income from external sources 231,423 280,251
Net interest income (expense) from internal sources (53,165) (76,256)
Net interest income 178,258 203,995
Provision for credit losses 148 4,160
Net interest income after provision for credit losses 178,110 199,835
Noninterest Income 55,521 50,173
Personnel 48,051 45,319
Other Cost and Expense, Operating 28,183 [1] 24,776 [2]
Noninterest Expense 76,234 70,095
Corporate expense allocations 17,414 [3] 18,397 [4]
Net income before taxes 139,983 161,516
Average assets 21,400,745 21,652,694
Operating Segments [Member] | Consumer [Member]    
Segment Reporting Information [Line Items]    
Net interest income from external sources 8,740 7,350
Net interest income (expense) from internal sources 48,512 56,785
Net interest income 57,252 64,135
Provision for credit losses 1,517 1,808
Net interest income after provision for credit losses 55,735 62,327
Noninterest Income 39,058 37,628
Personnel 25,837 25,236
Other Cost and Expense, Operating 31,399 [1] 28,211 [2]
Noninterest Expense 57,236 53,447
Corporate expense allocations 15,435 [3] 14,172 [4]
Net income before taxes 22,122 32,336
Average assets 8,201,821 7,928,757
Operating Segments [Member] | Wealth Management [Member]    
Segment Reporting Information [Line Items]    
Net interest income from external sources 13,942 2,635
Net interest income (expense) from internal sources 30,560 25,763
Net interest income 44,502 28,398
Provision for credit losses (8) (15)
Net interest income after provision for credit losses 44,510 28,413
Noninterest Income 96,336 118,704
Personnel 67,245 63,549
Other Cost and Expense, Operating 27,021 [1] 35,739 [2]
Noninterest Expense 94,266 99,288
Corporate expense allocations 13,854 [3] 14,779 [4]
Net income before taxes 32,726 33,050
Average assets 11,367,435 10,508,821
Funds Management and Other [Member]    
Segment Reporting Information [Line Items]    
Net interest income from external sources 62,146 3,336
Net interest income (expense) from internal sources (25,907) (6,292)
Net interest income 36,239 (2,956)
Provision for credit losses (1,657) 2,047
Net interest income after provision for credit losses 37,896 (5,003)
Noninterest Income (4,874) (44,804)
Personnel 73,052 68,549
Other Cost and Expense, Operating 46,741 [1] 49,005 [2]
Noninterest Expense 119,793 117,554
Corporate expense allocations (46,703) [3] (47,348) [4]
Net income before taxes (40,068) (120,013)
Average assets $ 10,016,902 $ 9,937,300
[1] Non-personnel expense includes other segment items comprised of Business promotion, Charitable contributions to BOKF Foundation, Professional fees and services, Net occupancy and equipment, FDIC and other insurance, Data processing and communications, Printing, postage, and supplies, Amortization of intangible assets, Mortgage banking costs, and other miscellaneous expenses.
[2] Non-personnel expense includes other segment items comprised of Business promotion, Charitable contributions to BOKF Foundation, Professional fees and services, Net occupancy and equipment, FDIC and other insurance, Data processing and communications, Printing, postage, and supplies, Amortization of intangible assets, Mortgage banking costs, and other miscellaneous expenses.
[3] Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.
[4] Corporate allocations include centrally managed operational and administrative expenses that are allocated to segments.