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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic and Diluted Earnings Per Share                      
Net income available to common stockholders, basic                 $ 284,757 $ 266,400 $ 210,544
Net income available to common stockholders, diluted                 $ 284,757 $ 266,400 $ 210,544
Average outstanding shares - basic (in shares)                 99,313,255 94,883,864 88,255,290
Add: dilutive restricted stock units and stock options (in shares)                 84,995 48,489 130,485
Average outstanding shares - diluted (in shares)                 99,398,250 94,932,353 88,385,775
Basic earnings per share (in dollars per share) $ 0.46 $ 0.79 $ 0.81 $ 0.85 $ 0.86 $ 0.81 $ 0.67 $ 0.46 $ 2.87 $ 2.81 $ 2.39
Diluted earnings per share (in dollars per share) $ 0.46 $ 0.79 $ 0.81 $ 0.85 $ 0.86 $ 0.81 $ 0.66 $ 0.46 $ 2.86 $ 2.81 $ 2.38
Restricted stock units and stock options excluded from the diluted average outstanding share calculation (in shares)                 194 88,240 0