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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 $ 353,885 $ 422,712 $ 438,214
Other comprehensive income (loss):      
Net unrealized gains (losses) on securities for which a portion of an other-than-temporary impairment has been recorded in earnings 0 (632) (277)
Net unrealized gains (losses) on other securities 161,728 151,122 (55,631)
Change in pension loss (3,178) 1,167 664
Unrealized gain (loss) on cash flow hedge derivatives 62,383 23,456 6,855
Other comprehensive income (loss) 220,933 175,113 (48,389)
Comprehensive income 574,818 597,825 389,825
Non-controlling interest expense (income) (172) 1,481 4,672
Comprehensive income attributable to Commerce Bancshares, Inc. $ 574,990 $ 596,344 $ 385,153