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Earnings Per Share (Calculation of Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 16,589	$ 23,543	$ 18,771	$ 14,583	$ 3,240	$ 16,592	$ 12,316	$ 12,167	$ 73,486	$ 44,315	$ 40,045
Average common shares:
Basic (weighted-average outstanding shares)									11,660,000	11,549,000	11,434,000
Dilutive potential common shares from stock options (in shares)									101,000	133,000	131,000
Diluted (weighted-average outstanding shares)	11,768,000	11,777,000	11,759,000	11,739,000	11,727,000	11,708,000	11,671,000	11,620,000	11,761,000	11,682,000	11,565,000
Basic earnings per share (in dollars per share)									$ 6.30	$ 3.84	$ 3.50
Diluted earnings per share (in dollars per share)	$ 1.41	$ 2.00	$ 1.60	$ 1.24	$ 0.27	$ 1.42	$ 1.05	$ 1.05	$ 6.25	$ 3.79	$ 3.46
Stock options excluded from diluted earnings per share calculation (in shares)									4,850	1,565	21,491

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