EPS (Computation of Basic and Diluted 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
Earnings Per Share [Abstract]
Net income	$ 18,143	$ 10,940	$ 37,883	$ 24,433
Dividends and undistributed earnings allocated to participating securities	(51)	(27)	(105)	(55)
Net income available to common shareholders	$ 18,092	$ 10,913	$ 37,778	$ 24,378
Weighted-average common shares outstanding for basic EPS	14,943,486	14,959,851	14,930,017	15,031,525
Dilutive effect of stock-based awards (shares)	63,985	37,760	64,121	37,607
Weighted-average common and potential common shares for diluted EPS (shares)	15,007,471	14,997,611	14,994,138	15,069,132
Basic EPS (in dollars per share)	$ 1.21	$ 0.73	$ 2.53	$ 1.62
Diluted EPS (in dollars per share)	$ 1.21	$ 0.73	$ 2.52	$ 1.62