Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income, Beginning Balance	$ 2,890	$ (5,263)
Other Comprehensive Income (Loss) Before Reclassification	3,798	2,412
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(301)	(148)
Total Other Comprehensive Income	3,497	2,264
Accumulated other comprehensive income, Ending Balance	6,387	(2,999)
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	2,958	(5,231)
Other Comprehensive Income (Loss) Before Reclassification	3,798	2,412
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(301)	(148)
Total Other Comprehensive Income	3,497	2,264
Accumulated other comprehensive income, Ending Balance	6,455	(2,967)
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	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	(68)	(32)
Other Comprehensive Income (Loss) Before Reclassification	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Total Other Comprehensive Income	0	0
Accumulated other comprehensive income, Ending Balance	$ (68)	$ (32)