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Shareholders' Equity Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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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 | $ 4,460,054 | $ 4,230,626
Common Equity Tier 1 Capital to Risk Weighted Assets | 0.1169 | 0.1224
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 | $ 4,464,763 | $ 4,235,265
Tier 1 Capital to Risk Weighted Assets | 0.1171 | 0.1225
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 | $ 4,830,826 | $ 4,594,787
Total Capital to Risk Weighted Assets | 0.1267 | 0.1329
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 | $ 4,464,763 | $ 4,235,265
Tier 1 Capital to Average Assets | 0.0991 | 0.0855
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 | $ 4,176,978 | $ 3,869,454
Common Equity Tier 1 Capital to Risk Weighted Assets | 0.1105 | 0.1127
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 | $ 4,178,531 | $ 3,871,457
Tier 1 Capital to Risk Weighted Assets | 0.1106 | 0.1128
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 | $ 4,478,559 | $ 4,164,940
Total Capital to Risk Weighted Assets | 0.1185 | 0.1213
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 | $ 4,178,531 | $ 3,871,457
Tier 1 Capital to Average Assets | 0.0931 | 0.0784

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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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