Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator [Abstract]
Net income	$ 23,618	$ 6,579
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,774,000	17,752,000
Diluted earnings per share [Abstract]
Effect of dilutive stock options and restricted stock grants (in shares)	13,000	11,000
Adjusted weighted average shares (in shares)	17,787,000	17,763,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 1.33	$ 0.37
Diluted earnings per share (in dollars per share)	$ 1.33	$ 0.37
Options [Member]
Earnings Per Share [Abstract]
Options excluded from diluted calculations (in shares)	0	20,000
Options excluded from diluted calculations, weighted average price (in dollars per share)		$ 32.27