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Net income per common share - Computation of net income (loss) per common share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share, Basic and Diluted [Abstract]    
Net income $ 211,686 $ 262,632
Preferred stock dividends (353) (353)
Net income applicable to common stock $ 211,333 $ 262,279
Average common shares outstanding 78,443,706 83,899,769
Average potential dilutive common shares 151,757 152,166
Average common shares outstanding - assuming dilution 78,595,463 84,051,935
Basic EPS $ 2.69 $ 3.13
Diluted EPS $ 2.69 $ 3.12