Net Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share, Basic [Abstract]
Net income	$ 140,930	$ 176,691	$ 132,217
Average common shares outstanding (in shares)	32,004,000	31,936,000	32,334,000
Basic net income per common share (in dollars per share)	$ 4.40	$ 5.53	$ 4.09
Earnings Per Share, Diluted [Abstract]
Net income	$ 140,930	$ 176,691	$ 132,217
Average common shares outstanding (in shares)	32,004,000	31,936,000	32,334,000
Adjustment for common share equivalents (in shares)	74,000	67,000	28,000
Average common shares outstanding-diluted (in shares)	32,078,000	32,003,000	32,362,000
Diluted net income per common share (in dollars per share)	$ 4.39	$ 5.52	$ 4.09
Anti-dilutive shares (in shares)	3,000	3,000	26,000