Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator [Abstract]
Net income	$ 23,931	$ 19,652	$ 47,549	$ 26,231
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,784,000	17,739,000	17,779,000	17,746,000
Diluted earnings per share [Abstract]
Effect of dilutive stock options and restricted stock grants (in shares)	16,000	3,000	15,000	7,000
Adjusted weighted average shares (in shares)	17,800,000	17,742,000	17,794,000	17,753,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 1.35	$ 1.11	$ 2.67	$ 1.48
Diluted earnings per share (in dollars per share)	$ 1.34	$ 1.11	$ 2.67	$ 1.48
Options [Member]
Earnings Per Share [Abstract]
Options excluded from diluted calculations (in shares)	0	0	0	0