Other Borrowed Funds (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Borrowed Funds [Line Items]
Balance		$ 8,955,450	$ 7,138,490	$ 2,494,428
Average Balance		$ 8,763,904	$ 3,025,223	$ 5,062,621
Rate		5.06%	1.95%	0.56%
Other borrowed funds, Maturities [Abstract]
2024		$ 8,637,633
2025		178,225
2026		3,225
2027		1,775
2028		0
Thereafter		134,592
Funds purchased [Member]
Other Borrowed Funds [Line Items]
Balance		$ 515,747	$ 99,843	$ 199,513
Rate		5.17%	0.05%	0.05%
Average Balance		$ 847,676	$ 266,344	$ 543,183
Rate		4.83%	1.12%	0.46%
Maximum Outstanding At Any Month End		$ 1,711,580	$ 444,069	$ 542,465
Repurchase agreements [Member]
Other Borrowed Funds [Line Items]
Balance		$ 607,001	$ 2,170,534	$ 2,126,936
Rate		1.70%	4.42%	0.08%
Average Balance		$ 1,805,978	$ 998,701	$ 1,695,519
Rate		4.32%	1.02%	0.33%
Maximum Outstanding At Any Month End		$ 4,433,480	$ 3,034,312	$ 2,920,728
Other Borrowings [Member]
Other Borrowed Funds [Line Items]
Balance		7,701,552	4,736,908	36,753
Average Balance		$ 5,979,095	$ 1,628,972	$ 2,599,861
Rate		5.28%	2.41%	0.38%
Federal Home Loan Bank advances [Member]
Other Borrowed Funds [Line Items]
Balance		$ 7,675,000	$ 4,700,000	$ 0
Rate		5.51%	4.48%	0.00%
Average Balance		$ 5,948,863	$ 1,593,699	$ 1,679,315
Rate		5.28%	2.37%	0.27%
Maximum Outstanding At Any Month End		$ 7,875,000	$ 4,700,000	$ 2,600,000
GNMA repurchase liability [Member]
Other Borrowed Funds [Line Items]
Balance		$ 11,660	$ 10,608	$ 7,420
Rate		4.13%	4.06%	4.36%
Average Balance		$ 11,224	$ 6,692	$ 11,956
Rate		4.04%	4.38%	4.06%
Maximum Outstanding At Any Month End		$ 12,414	$ 11,011	$ 23,856
Paycheck protection program liquidity facility
Other Borrowed Funds [Line Items]
Balance				$ 0
Rate				0.00%
Average Balance				$ 879,145
Rate				0.35%
Maximum Outstanding At Any Month End				$ 1,662,598
Other [Member]
Other Borrowed Funds [Line Items]
Balance		$ 14,892	$ 26,300	$ 29,333
Rate		5.50%	3.20%	3.23%
Average Balance		$ 19,008	$ 28,581	$ 29,445
Rate		3.91%	3.12%	4.18%
Maximum Outstanding At Any Month End		$ 26,311	$ 30,382	$ 31,875
Subordinated debentures [Member]
Other Borrowed Funds [Line Items]
Balance	[1]	$ 131,150	$ 131,205	$ 131,226
Rate	[1]	6.93%	6.34%	3.95%
Average Balance	[1]	$ 131,155	$ 131,206	$ 224,058
Rate	[1]	6.83%	4.95%	4.70%
Maximum Outstanding At Any Month End	[1]	$ 131,164	$ 131,230	$ 276,049
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 SOFR plus 0.26% tenor spread adjustment 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 SOFR plus 0.26% tenor spread adjustment 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 SOFR plus 0.26% tenor spread adjustment 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 SOFR plus 0.26% tenor spread adjustment 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		$ 513,000
Unused credit available pursuant to the FHLB's collateral policies		2,800,000
Subsidiaries [Member] | BOK Financial Securities, Inc. [Member] | Other [Member]
Other Borrowed Funds [Line Items]
Balance		$ 0	$ 0

[1] Parent Company only.