Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Comprehensive Income [Line Items]
Unrealized Gains and Losses on Available-for-Sale Securities, Beginning Balance	$ (1,247)		$ 10,643
Unrealized Gains and Losses on Available-for-Sale Securities, Other Comprehensive Income (Loss) Before Reclassification	(1,118)		(12,366)
Unrealized Gains and Losses on Available-for-Sale Securities, Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(255)		(897)
Unrealized Gains and Losses on Available-for-Sale Securities, Net Current Period Other Comprehensive Income (Loss)	(1,373)	1,186	(13,263)	2,365
Unrealized Gains and Losses on Available-for-Sale Securities, Ending Balance	(2,620)		(2,620)
Defined Benefit Pension Items, Beginning Balance	(231)		(231)
Defined Benefit Pension Items, Other Comprehensive Income (Loss) Before Reclassification	0		0
Defined Benefit Pension Items, Amounts Reclassified from Accumulated Other Comprehensive Income	0		0
Defined Benefit Pension Items, Net Current Period Other Comprehensive Income (Loss)	0		0
Defined Benefit Pension Items, Ending Balance	(231)		(231)
Postretirement Benefit Items, Beginning Balance	(61)		(61)
Postretirement Benefit Items, Other Comprehensive Income (Loss) Before Reclassification	0		0
Postretirement Benefit Items, Amounts Reclassified from Accumulated Other Comprehensive Income	0		0
Postretirement Benefit Items, Net Current Period Other Comprehensive Income (Loss)	0		0
Postretirement Benefit Items, Ending Balance	(61)		(61)
Accumulated other comprehensive income, Beginning Balance	(1,539)		10,351
Other Comprehensive Income (Loss) Before Reclassification	(1,118)		(12,366)
Amounts Reclassified from Accumulated Other Comprehensive Income	(255)		(897)
Net Current Period Other Comprehensive Income (Loss)	(1,373)		(13,263)
Accumulated other comprehensive income, Ending Balance	$ (2,912)		$ (2,912)