Benefit Plans (Components of shares eligible to be issued under the Directors Plan) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Eligible shares, unissued	19,401	13,934
Director [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Eligible shares, unissued	180,616	173,435
Eligible shares, shares held in Rabbi Trust	19,401	13,934
Eligible shares, total	200,017	187,369
Market value, unissued	$ 5,400	$ 3,902
Market value, shares held in Rabbi Trust	580	314
Market value, total	$ 5,980	$ 4,216