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Shareholders' Equity Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Common Equity Tier 1 Capital [Abstract] |  |
Minimum Capital Requirements, Common Equity Tier 1 to Risk Weighted Assets | 4.50% | 4.50%
Capital Conservation Buffer, Common Equity Tier 1 to Risk Weighted Assets | 2.50% | 2.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Common Equity Tier 1 to Risk Weighted Assets | 7.00% | 7.00%
Common Equity Tier 1 Capital | $ 4,683,510 | $ 4,460,054
Common Equity Tier 1 Capital to Risk Weighted Assets | 0.1206 | 0.1169
Tier I Capital (to Risk Weighted Assets) [Abstract] |  |
Minimum Capital Requirement, Tier 1 Capital to Risk Weighted Assets | 0.0600 | 0.0600
Capital Conservation Buffer, Tier 1 Capital to Risk Weighted Assets | 2.50% | 2.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Tier One to Risk Weighted Assets | 8.50% | 8.50%
Tier 1 Capital | $ 4,686,487 | $ 4,464,763
Tier 1 Capital to Risk Weighted Assets | 0.1207 | 0.1171
Total Capital (to Risk Weighted Assets) [Abstract] |  |
Minimum Capital Requirement, Total Capital to Risk Weighted Assets | 0.0800 | 0.0800
Capital Conservation Buffer, Total Capital to Risk Weighted Assets | 2.50% | 2.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Total Capital to Risk Weighted Assets | 10.50% | 10.50%
Total Capital | $ 5,110,471 | $ 4,830,827
Total Capital to Risk Weighted Assets | 0.1316 | 0.1267
Tier 1 Capital (to Average Assets) [Abstract] |  |
Minimum Capital Requirement, Tier 1 Capital to Average Assets | 0.0400 | 0.0400
Minimum Capital Requirements Including Capital Conservation Buffer, Tier 1 Capital to Average Assets | 4.00% | 4.00%
Tier 1 Leverage Capital | $ 4,686,487 | $ 4,464,763
Tier 1 Capital to Average Assets | 0.0945 | 0.0991
Subsidiaries [Member] | BOKF, NA [Member] |  |
Common Equity Tier 1 Capital [Abstract] |  |
Common Equity Tier 1 Capital Ratio Required to be Well Capitalized | 6.50% | 6.50%
Minimum Capital Requirements, Common Equity Tier 1 to Risk Weighted Assets | 4.50% | 4.50%
Minimum Capital Requirement Including Capital Conservation Buffer, Common Equity Tier 1 to Risk Weighted Assets | 4.50% | 4.50%
Common Equity Tier 1 Capital | $ 4,370,891 | $ 4,176,978
Common Equity Tier 1 Capital to Risk Weighted Assets | 0.1137 | 0.1105
Tier I Capital (to Risk Weighted Assets) [Abstract] |  |
Tier I Capital Ratio Required to be Well Capitalized | 0.0800 | 0.0800
Minimum Capital Requirement, Tier 1 Capital to Risk Weighted Assets | 0.0600 | 0.0600
Minimum Capital Requirement Including Capital Conservation Buffer, Tier One to Risk Weighted Assets | 6.00% | 6.00%
Tier 1 Capital | $ 4,370,891 | $ 4,178,531
Tier 1 Capital to Risk Weighted Assets | 0.1137 | 0.1106
Total Capital (to Risk Weighted Assets) [Abstract] |  |
Total Capital Ratio Required to be Well Capitalized | 0.1000 | 0.1000
Minimum Capital Requirement, Total Capital to Risk Weighted Assets | 0.0800 | 0.0800
Minimum Capital Requirement Including Capital Conservation Buffer, Total Capital to Risk Weighted Assets | 8.00% | 8.00%
Total Capital | $ 4,728,876 | $ 4,478,559
Total Capital to Risk Weighted Assets | 0.1230 | 0.1185
Tier 1 Capital (to Average Assets) [Abstract] |  |
Leverage Ratio Required to be Well Capitalized | 0.0500 | 0.0500
Minimum Capital Requirement, Tier 1 Capital to Average Assets | 0.0400 | 0.0400
Minimum Capital Requirements Including Capital Conservation Buffer, Tier 1 Capital to Average Assets | 4.00% | 4.00%
Tier 1 Leverage Capital | $ 4,370,891 | $ 4,178,531
Tier 1 Capital to Average Assets | 0.0886 | 0.0931

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