Earnings Per Common Share - Schedule of Reconciliation of Weighted Average Number of Common Shares Outstanding for Computing Diluted Earnings Per Share and Antidilutive Stock Options and Restricted Stock Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net Income Available to Common Shareholders	$ 61,047	$ 37,840	$ 188,529	$ 111,490
Denominator:
Weighted Average Common Shares Outstanding - Basic	39,881,437	39,745,120	39,870,450	39,710,252
Dilutive Effect of Equity Based Awards (in shares)	199,482	124,015	218,449	162,154
Weighted Average Common Shares Outstanding - Diluted	40,080,919	39,869,135	40,088,899	39,872,406
Earnings Per Common Share:
Basic	$ 1.53	$ 0.95	$ 4.73	$ 2.81
Diluted	$ 1.52	$ 0.95	$ 4.70	$ 2.80
Antidilutive Stock Options and Restricted Stock Outstanding (in shares)	47,087	108,207	44,217	106,140