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Net Income Per Common Share - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic                      
Net income applicable to common stock $ 31,521 $ 29,992 $ 20,130 $ 2,008 $ 38,415 $ 37,446 $ 46,625 $ 45,110 $ 83,651 $ 167,596 $ 146,920
Average common shares outstanding (shares)                 56,270,566 58,046,716 52,492,104
Net income per common share - basic (usd per share) $ 0.56 $ 0.53 $ 0.36 $ 0.04 $ 0.67 $ 0.65 $ 0.80 $ 0.77 $ 1.49 $ 2.89 $ 2.80
Diluted                      
Net income applicable to common stock $ 31,521 $ 29,992 $ 20,130 $ 2,008 $ 38,415 $ 37,446 $ 46,625 $ 45,110 $ 83,651 $ 167,596 $ 146,920
Average common shares outstanding (shares)                 56,270,566 58,046,716 52,492,104
Effect of dilutive stock-based compensation (shares)                 197,599 179,970 134,746
Average common shares outstanding - diluted (shares)                 56,468,165 58,226,686 52,626,850
Net income per common share - diluted (usd per share) $ 0.56 $ 0.53 $ 0.36 $ 0.04 $ 0.67 $ 0.64 $ 0.80 $ 0.77 $ 1.48 $ 2.88 $ 2.79