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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income $ 435,071 $ 500,685 $ 446,424
Other comprehensive income (loss), before income taxes: [Abstract]      
Net change in unrealized gain (loss) 313,796 241,047 (48,010)
Reclassification adjustments included in earnings: [Abstract]      
Loss (gain) on available for sale securities, net (9,910) (5,597) 2,801
Other comprehensive gain (loss), before income taxes 303,886 235,450 (45,209)
Federal and state income taxes 72,941 57,942 (11,507)
Other comprehensive gain (loss), net of income taxes 230,945 177,508 (33,702)
Comprehensive income 666,016 678,193 412,722
Comprehensive income (loss) attributable to non-controlling interests 41 (73) 778
Comprehensive income attributable to BOK Financial Corp. shareholders $ 665,975 $ 678,266 $ 411,944