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Summary Of Significant Accounting Policies (Schedule Of Stock Options Granted And Related Estimated Fair Value At Date Of Grant) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock options granted (number of shares):
Stock options granted (number of shares)	0	0	181,476
Estimated weighted average fair value of options per share at date of grant:
Total estimated fair value of stock options granted			$ 1,521
Officers
Stock options granted (number of shares):
Stock options granted (number of shares)			87,820
Estimated weighted average fair value of options per share at date of grant:
Estimated weighted average fair value of options per share at date of grant			$ 9.21
Management
Stock options granted (number of shares):
Stock options granted (number of shares)			93,656
Estimated weighted average fair value of options per share at date of grant:
Estimated weighted average fair value of options per share at date of grant			$ 7.60

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Share based compensation arrangement by share based payment award estimated fair value of stock options granted

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Net number of share options (or share units) granted during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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