Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	$ 3,812	$ 2,890
Other Comprehensive Income (Loss) Before Reclassification	4,029	3,798
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(301)
Total Other Comprehensive Income (Loss)	4,029	3,497
Accumulated other comprehensive income, Ending Balance	7,841	6,387
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	3,890	2,958
Other Comprehensive Income (Loss) Before Reclassification	4,029	3,798
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	(301)
Total Other Comprehensive Income (Loss)	4,029	3,497
Accumulated other comprehensive income, Ending Balance	7,919	6,455
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	0	0
Other Comprehensive Income (Loss) Before Reclassification	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Total Other Comprehensive Income (Loss)	0	0
Accumulated other comprehensive income, Ending Balance	0	0
Postretirement Benefit Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	(78)	(68)
Other Comprehensive Income (Loss) Before Reclassification	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Total Other Comprehensive Income (Loss)	0	0
Accumulated other comprehensive income, Ending Balance	$ (78)	$ (68)