Accumulated Other Comprehensive Income (Components of Accumulated Other Comprehensive Income and Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Balance as of			$ 2,797
Other comprehensive loss	(3,323)	3	(3,984)	(156)
Balance as of	(1,187)		(1,187)
Unrealized gains on available for sale securities [Member]
Balance as of	2,135		2,797
Other comprehensive loss before reclassification	(3,154)		(3,725)
Amount reclassified from accumulated other comprehensive income	(168)		(259)
Other comprehensive loss	(3,322)		(3,984)
Balance as of	$ (1,187)		$ (1,187)