Accumulated Other Comprehensive Income (Changes in AOCI) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 3,325
Other comprehensive income before reclassifications			(1,243)
Amounts reclassified from accumulated other comprehensive income			(359)
Net current period other comprehensive income	(2,180)	(445)	(1,602)	(83)	315
Ending balance	1,723		1,723		3,325
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(1,003)
Other comprehensive income before reclassifications			354
Amounts reclassified from accumulated other comprehensive income			0
Net current period other comprehensive income			354
Ending balance	(649)		(649)
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			4,328
Other comprehensive income before reclassifications			(1,597)
Amounts reclassified from accumulated other comprehensive income			(359)
Net current period other comprehensive income			(1,956)
Ending balance	$ 2,372		$ 2,372