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Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Income Statements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Income Statements, Captions [Line Items] |  |  |
Interest expense | $ 61,896 | $ 160,556 | $ 419,079
Other operating expense | 1,177,708 | 1,164,308 | 1,133,244
Other gains (losses), net | 63,742 | 6,046 | 10,214
Federal and state income taxes | 179,775 | 128,793 | 130,183
Net income attributable to BOK Financial Corp. shareholders | 618,121 | 435,030 | 500,758
Parent Company [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | 492,665 | 205,097 | 354,368
Interest expense | 10,535 | 13,944 | 15,113
Other operating expense | 2,914 | 2,697 | 2,352
Total expense | 13,449 | 16,641 | 17,465
Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries | 479,216 | 188,456 | 336,903
Other gains (losses), net | (3,415) | 1,465 | 3,310
Net income before taxes and equity in undistributed income of subsidiaries | 475,801 | 189,921 | 340,213
Federal and state income taxes | (4,202) | (4,502) | (4,516)
Net income before equity in undistributed income of subsidiaries | 480,003 | 194,423 | 344,729
Equity in undistributed income of bank subsidiaries | 126,380 | 276,217 | 166,797
Equity in undistributed income of non-bank subsidiaries | 11,738 | (35,610) | (10,768)
Net income attributable to BOK Financial Corp. shareholders | 618,121 | 435,030 | 500,758
Parent Company [Member] | Dividends, interest and fees received from bank susidiaries [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | 483,868 | 179,140 | 344,007
Parent Company [Member] | Dividends, interest and fees received from non-bank subsidiaries [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | 8,030 | 25,050 | 9,325
Parent Company [Member] | Other revenue [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | $ 767 | $ 907 | $ 1,036

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