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Other Borrowed Funds (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Borrowed Funds [Line Items]      
Balance $ 7,138,490 $ 2,494,428 $ 3,821,361
Average Balance $ 3,025,223 $ 5,062,621 $ 8,570,959
Rate 1.95% 0.56% 0.82%
Other borrowed funds, Maturities [Abstract]      
2023 $ 6,989,462    
2024 3,839    
2025 3,964    
2026 4,094    
2027 2,610    
Thereafter 134,521    
Funds purchased [Member]      
Other Borrowed Funds [Line Items]      
Balance $ 99,843 $ 199,513 $ 769,365
Rate 0.05% 0.05% 0.05%
Average Balance $ 266,344 $ 543,183 $ 2,045,795
Rate 1.12% 0.46% 0.58%
Maximum Outstanding At Any Month End $ 444,069 $ 542,465 $ 3,311,938
Repurchase agreements [Member]      
Other Borrowed Funds [Line Items]      
Balance $ 2,170,534 $ 2,126,936 $ 893,021
Rate 4.42% 0.08% 0.09%
Average Balance $ 998,701 $ 1,695,519 $ 1,589,746
Rate 1.02% 0.33% 0.24%
Maximum Outstanding At Any Month End $ 3,034,312 $ 2,920,728 $ 3,230,097
Other Borrowings [Member]      
Other Borrowed Funds [Line Items]      
Balance 4,736,908 36,753 1,882,970
Average Balance $ 1,628,972 $ 2,599,861 $ 4,659,453
Rate 2.41% 0.38% 0.88%
Federal Home Loan Bank advances [Member]      
Other Borrowed Funds [Line Items]      
Balance $ 4,700,000 $ 0 $ 200,000
Rate 4.48% 0.00% 0.29%
Average Balance $ 1,593,699 $ 1,679,315 $ 3,393,989
Rate 2.37% 0.27% 1.00%
Maximum Outstanding At Any Month End $ 4,700,000 $ 2,600,000 $ 7,500,000
GNMA repurchase liability [Member]      
Other Borrowed Funds [Line Items]      
Balance $ 10,608 $ 7,420 $ 19,500
Rate 4.06% 4.36% 4.35%
Average Balance $ 6,692 $ 11,956 $ 42,771
Rate 4.38% 4.06% 4.18%
Maximum Outstanding At Any Month End $ 11,011 $ 23,856 $ 126,569
Paycheck protection program liquidity facility      
Other Borrowed Funds [Line Items]      
Balance   $ 0 $ 1,635,963
Rate   0.00% 0.35%
Average Balance   $ 879,145 $ 1,152,073
Rate   0.35% 0.35%
Maximum Outstanding At Any Month End   $ 1,662,598 $ 2,013,414
Federal Reserve Bank Advances      
Other Borrowed Funds [Line Items]      
Balance     $ 0
Rate     0.00%
Average Balance     $ 42,464
Rate     0.26%
Maximum Outstanding At Any Month End     $ 0
Other [Member]      
Other Borrowed Funds [Line Items]      
Balance $ 26,300 $ 29,333 $ 27,507
Rate 3.20% 3.23% 5.24%
Average Balance $ 28,581 $ 29,445 $ 28,156
Rate 3.12% 4.18% 5.12%
Maximum Outstanding At Any Month End $ 30,382 $ 31,875 $ 49,376
Subordinated debentures [Member]      
Other Borrowed Funds [Line Items]      
Balance [1] $ 131,205 $ 131,226 $ 276,005
Rate [1] 6.34% 3.95% 4.72%
Average Balance [1] $ 131,206 $ 224,058 $ 275,965
Rate [1] 4.95% 4.70% 5.05%
Maximum Outstanding At Any Month End [1] $ 131,230 $ 276,049 $ 276,005
Subordinated debentures [Member] | Subordinated debentures-acquired, 2015 Issuance [Member]      
Other borrowed funds, Other Disclosures [Abstract]      
Amount of debt issuance $ 60,000    
Maturity date Jun. 25, 2030    
Stated interest rate 5.625%    
Interest rate description three-month LIBOR plus 3.17%    
Debt Instrument, Call Date, Earliest Jun. 25, 2025    
Subordinated debentures [Member] | Junior subordinated debentures-acquired, 2003 issuance [Member]      
Other borrowed funds, Other Disclosures [Abstract]      
Amount of debt issuance $ 21,000    
Maturity date Sep. 17, 2033    
Interest rate description three-month LIBOR plus 2.95%    
Subordinated debentures [Member] | Junior subordinated debentures-acquired, 2004 issuance [Member]      
Other borrowed funds, Other Disclosures [Abstract]      
Amount of debt issuance $ 31,000    
Maturity date Jul. 23, 2034    
Interest rate description three-month LIBOR plus 2.60%    
Subordinated debentures [Member] | Junior subordinated debentures-acquired, 2005 issuance [Member]      
Other borrowed funds, Other Disclosures [Abstract]      
Amount of debt issuance $ 20,000    
Maturity date Sep. 30, 2035    
Interest rate description three-month LIBOR plus 1.45%    
Subsidiaries [Member] | Funds purchased [Member]      
Other borrowed funds, Other Disclosures [Abstract]      
Number of days to maturity, minimum 1 day    
Number of days to maturity, maximum 90 days    
Subsidiaries [Member] | Repurchase agreements [Member]      
Other borrowed funds, Other Disclosures [Abstract]      
Number of days to maturity, maximum 90 days    
Subsidiaries [Member] | Federal Home Loan Bank advances [Member]      
Other borrowed funds, Other Disclosures [Abstract]      
Federal Home Loan Banks, Letters of credit issued to secure public funds $ 419,000    
Unused credit available pursuant to the FHLB's collateral policies 2,100,000    
Subsidiaries [Member] | BOK Financial Securities, Inc. [Member] | Other [Member]      
Other Borrowed Funds [Line Items]      
Balance $ 0 $ 0  
[1] Parent Company only.