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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |
Interest expense | $ 419,079 | $ 243,559 | $ 131,050
Other operating expense | 1,132,381 | 1,028,166 | 1,025,517
Other gains (losses), net | (9,351) | 2,265 | (11,434)
Federal and state income taxes | 130,183 | 119,061 | 182,593
Net income attributable to BOK Financial Corp. shareholders | 500,758 | 445,646 | 334,644
Parent Company [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | 354,368 | 439,825 | 168,585
Interest expense | 15,113 | 9,827 | 8,239
Other operating expense | 2,352 | 12,110 | 2,014
Total expense | 17,465 | 21,937 | 10,253
Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries | 336,903 | 417,888 | 158,332
Other gains (losses), net | 3,310 | (3,921) | 0
Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries | 340,213 | 413,967 | 158,332
Federal and state income taxes | (4,516) | (7,078) | (4,305)
Net income before equity in undistributed income of subsidiaries | 344,729 | 421,045 | 162,637
Equity in undistributed income of bank subsidiaries | 166,797 | 37,515 | 181,552
Equity in undistributed income of non-bank subsidiaries | (10,768) | (12,914) | (9,545)
Net income attributable to BOK Financial Corp. shareholders | 500,758 | 445,646 | 334,644
Parent Company [Member] | Dividends, interest and fees received from bank susidiaries [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | 344,007 | 426,071 | 150,149
Parent Company [Member] | Diviidends, interest and fees received from non-bank subsidiaries [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | 9,325 | 12,800 | 17,500
Parent Company [Member] | Other revenue [Member] |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |
Total revenue | $ 1,036 | $ 954 | $ 936

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