EPS (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income		$ 10,940	$ 13,204	$ 24,433	$ 27,477
Dividends and undistributed earnings allocated to participating securities	[1]	(27)	(26)	(55)	(54)
Net income available to common shareholders		$ 10,913	$ 13,178	$ 24,378	$ 27,423
Weighted-average common shares outstanding for basic EPS		14,959,851	15,519,827	15,031,525	15,555,770
Dilutive effect of stock-based awards (shares)	[2]	37,760	39,933	37,607	39,884
Weighted-average common and potential common shares for diluted EPS (shares)		14,997,611	15,559,760	15,069,132	15,595,654
Basic EPS (in dollars per share)		$ 0.73	$ 0.85	$ 1.62	$ 1.76
Diluted EPS (in dollars per share)		$ 0.73	$ 0.85	$ 1.62	$ 1.76
Antidilutive Stock options (shares)	[3]	11,202	0	3,429	0

[1] (1) Represents dividends paid and undistributed earnings allocated to nonvested stock-based awards that contain non-forfeitable rights to dividends.

[2] (2) Represents the assumed dilutive effect of unexercised and/or unvested stock options, restricted shares, restricted share units and contingently issuable performance-based awards utilizing the treasury stock method.

[3] (3) Represents stock-based awards not included in the computation of potential common shares for purposes of calculating diluted EPS as the exercise prices were greater than the average market price of the Company's common stock, and, therefore, are considered anti-dilutive.