Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (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
Basic earnings per share
Net income	$ 23,071	$ 20,312	$ 65,666	$ 46,606
Weighted average common shares outstanding (in shares)	43,810,729	43,862,435	43,893,194	44,099,862
Basic earnings per share (in USD per share)	$ 0.53	$ 0.46	$ 1.50	$ 1.06
Diluted earnings per share
Net income	$ 23,071	$ 20,312	$ 65,666	$ 46,606
Effect of dilutive securities:
Weighted average common shares outstanding (in shares)	43,958,870	43,903,881	44,047,043	44,165,650
Diluted earnings per share (in USD per share)	$ 0.52	$ 0.46	$ 1.49	$ 1.06
Restricted stock
Effect of dilutive securities:
Effect of dilutive securities (in shares)	99,666	8,246	102,446	32,574
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	48,475	33,200	51,403	33,214