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Shareholders' Equity Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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 | $ 4,230,626 | $ 3,881,912
Common Equity Tier 1 Capital to Risk Weighted Assets | 0.1224 | 0.1195
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 | $ 4,235,265 | $ 3,881,912
Tier 1 Capital to Risk Weighted Assets | 0.1225 | 0.1195
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 | $ 4,594,787 | $ 4,489,110
Total Capital to Risk Weighted Assets | 0.1329 | 0.1382
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 | $ 4,235,265 | $ 3,881,912
Tier 1 Capital to Average Assets | 0.0855 | 0.0828
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 | $ 3,869,454 | $ 3,756,950
Common Equity Tier 1 Capital to Risk Weighted Assets | 0.1127 | 0.1166
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 | $ 3,871,457 | $ 3,756,950
Tier 1 Capital to Risk Weighted Assets | 0.1128 | 0.1166
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 | $ 4,164,940 | $ 4,153,347
Total Capital to Risk Weighted Assets | 0.1213 | 0.1289
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 | $ 3,871,457 | $ 3,756,950
Tier 1 Capital to Average Assets | 0.0784 | 0.0804

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- Definition The common equity Tier 1 capital ratio (common equity Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References No definition available. + Details
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