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Common Stock and Earnings per Share (Schedule of Calculations of Basic and Diluted Earnings Per Share) (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
Basic
Net income	$ 7,057	$ 7,610	$ 7,509	$ 8,092	$ 5,331	$ 6,863	$ 6,513	$ 6,307	$ 30,268	$ 25,014	$ 24,348
Weighted average common shares outstanding (in shares)									14,675,136	14,700,557	14,718,228
Basic earnings per share (in dollars per share)	$ 0.48	$ .52	$ 0.51	$ .55	$ .36	$ .47	$ .44	$ .43	$ 2.06	$ 1.70	$ 1.65
Diluted
Net income	$ 7,057	$ 7,610	$ 7,509	$ 8,092	$ 5,331	$ 6,863	$ 6,513	$ 6,307	$ 30,268	$ 25,014	$ 24,348
Weighted average common shares outstanding (in shares)									14,675,136	14,700,557	14,718,228
Effect of dilutive restricted stock, performance based restricted stock ("PBRS"), and SARs									239,065	215,332	206,878
Weighted average common shares outstanding assuming dilution (in shares)									14,914,202	14,915,890	14,925,106
Diluted earnings per share (in dollars per share)	$ 0.47	$ 0.51	$ 0.50	$ 0.54	$ 0.36	$ 0.46	$ 0.44	$ 0.42	$ 2.03	$ 1.68	$ 1.63

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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