Other Comprehensive Income (Loss) (Schedule of Other Comprehensive Income Components) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 2,890	$ (5,263)
Other Comprehensive Income (Loss) Before Reclassification	1,390	9,086
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(468)	(933)
Net Current Period Other
Comprehensive Income (Loss)	922	8,153	$ (15,614)
Ending Balance	3,812	2,890	(5,263)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	2,958	(5,231)
Other Comprehensive Income (Loss) Before Reclassification	1,403	9,152
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(471)	(963)
Net Current Period Other
Comprehensive Income (Loss)	932	8,189
Ending Balance	3,890	2,958	(5,231)
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(68)	(32)
Other Comprehensive Income (Loss) Before Reclassification	(13)	(66)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	3	30
Net Current Period Other
Comprehensive Income (Loss)	(10)	(36)
Ending Balance	$ (78)	$ (68)	$ (32)