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Parent Company Only Financial Statements Parent Company Only Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract] |
Condensed Balance Sheet [Table Text Block] | Balance Sheets (In thousands)
|  | December 31,
|  | 2020 |  | 2019
Assets |  |  |  |
Cash and cash equivalents |  | $ | 183,805 |  |  | $ | 214,779 |
Loan to bank subsidiary |  | 65,204 |  |  | 65,220 |
Investment in bank subsidiaries |  | 5,079,336 |  |  | 4,602,977 |
Investment in non-bank subsidiaries |  | 195,768 |  |  | 216,542 |
Other assets |  | 24,338 |  |  | 38,082 |
Total assets |  | $ | 5,548,451 |  |  | $ | 5,137,600 |
Liabilities and Shareholders’ Equity |  |  |  |
Liabilities: |  |  |  |
Other liabilities |  | $ | 6,180 |  |  | $ | 5,882 |
Subordinated debentures |  | 276,005 |  |  | 275,923 |
Total liabilities |  | 282,185 |  |  | 281,805 |
Shareholders’ equity: |  |  |  |
Common stock |  | 5 |  |  | 5 |
Capital surplus |  | 1,368,062 |  |  | 1,350,995 |
Retained earnings |  | 3,973,675 |  |  | 3,729,778 |
Treasury stock |  | (411,344) |  |  | (329,906) |
Accumulated other comprehensive income |  | 335,868 |  |  | 104,923 |
Total shareholders’ equity |  | 5,266,266 |  |  | 4,855,795 |
Total liabilities and shareholders’ equity |  | $ | 5,548,451 |  |  | $ | 5,137,600 |
Condensed Income Statement [Table Text Block] | Statements of Earnings (In thousands)
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Dividends, interest and fees received from bank subsidiaries |  | $ | 179,140 |  |  | $ | 344,007 |  |  | $ | 426,071 |
Dividends, interest and fees received from non-bank subsidiaries |  | 25,050 |  |  | 9,325 |  |  | 12,800 |
Other revenue |  | 907 |  |  | 1,036 |  |  | 954 |
Total revenue |  | 205,097 |  |  | 354,368 |  |  | 439,825 |
Interest expense |  | 13,944 |  |  | 15,113 |  |  | 9,827 |
Other operating expense |  | 2,697 |  |  | 2,352 |  |  | 12,110 |
Total expense |  | 16,641 |  |  | 17,465 |  |  | 21,937 |
Net income before taxes, other losses, net, and equity in undistributed income of subsidiaries |  | 188,456 |  |  | 336,903 |  |  | 417,888 |
Other gains (losses), net |  | 1,465 |  |  | 3,310 |  |  | (3,921) |
Net income before taxes and equity in undistributed income of subsidiaries |  | 189,921 |  |  | 340,213 |  |  | 413,967 |
Federal and state income taxes |  | (4,502) |  |  | (4,516) |  |  | (7,078) |
Net income before equity in undistributed income of subsidiaries |  | 194,423 |  |  | 344,729 |  |  | 421,045 |
Equity in undistributed income of bank subsidiaries |  | 276,217 |  |  | 166,797 |  |  | 37,515 |
Equity in undistributed income of non-bank subsidiaries |  | (35,610) |  |  | (10,768) |  |  | (12,914) |
Net income attributable to BOK Financial Corp. shareholders |  | $ | 435,030 |  |  | $ | 500,758 |  |  | $ | 445,646 |
Condensed Cash Flow Statement [Table Text Block] | Statements of Cash Flows (In thousands)
|  | Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Cash Flows From Operating Activities: |  |  |  |  |  |
Net income |  | $ | 435,030 |  |  | $ | 500,758 |  |  | $ | 445,646 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |
Equity in undistributed income of bank subsidiaries |  | (276,217) |  |  | (166,797) |  |  | (37,515) |
Equity in undistributed income of non-bank subsidiaries |  | 35,610 |  |  | 10,768 |  |  | 12,914 |
Change in other assets |  | 13,760 |  |  | (5,075) |  |  | (1,072) |
Change in other liabilities |  | 850 |  |  | 855 |  |  | (13,434) |
Net cash provided by operating activities |  | 209,033 |  |  | 340,509 |  |  | 406,539 |
Cash Flows From Investing Activities: |  |  |  |  |  |
Investment in subsidiaries |  | (14,807) |  |  | (19,837) |  |  | (31,901) |
Acquisitions, net of cash acquired |  | — |  |  | — |  |  | (232,680) |
Net cash used in investing activities |  | (14,807) |  |  | (19,837) |  |  | (264,581) |
Cash Flows From Financing Activities: |  |  |  |  |  |
Issuance of common and treasury stock, net |  | (4,933) |  |  | (7) |  |  | (88) |
Dividends paid |  | (144,437) |  |  | (143,496) |  |  | (127,188) |
Repurchase of common stock |  | (75,830) |  |  | (129,483) |  |  | (53,465) |
Net cash used in financing activities |  | (225,200) |  |  | (272,986) |  |  | (180,741) |
Net increase (decrease) in cash and cash equivalents |  | (30,974) |  |  | 47,686 |  |  | (38,783) |
Cash and cash equivalents at beginning of period |  | 214,779 |  |  | 167,093 |  |  | 205,876 |
Cash and cash equivalents at end of period |  | $ | 183,805 |  |  | $ | 214,779 |  |  | $ | 167,093 |
Cash paid for interest |  | $ | 14,064 |  |  | $ | 15,099 |  |  | $ | 11,457 |

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