Stock Option Plans (Summary of Status and Changes in Stock Option Plan) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Options outstanding, Beginning balance	210,862
Options granted	0	0	0
Options exercised	140,962	28,538	65,161
Options outstanding, Ending balance	69,900	210,862
Weighted Average Exercise Price
Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 7.63
Options Exercised, Weighted Average Exercise Price	7.43
Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 8.03	$ 7.63
Weighted- Average Remaining Contractual Life (in years)
Options Outstanding, Weighted-Average Remaining Contractual Life	4 years 10 months 24 days
Aggregate Intrinsic Value
Options Outstanding, Aggregate Intrinsic Value	$ 2,211