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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
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Other Comprehensive Loss Before Reclassifications [Member]
Mar. 31, 2013
Total Other Comprehensive Loss [Member]
Mar. 31, 2013
Amount Reclassified To From Accumulated Other Comprehensive Income [Member]
Accumulated other comprehensive income $ 2,135 [1] $ 2,797 [1]      
Balance as of 2,135 [1] 2,797 [1]      
Unrealized gains on available for sale securities     (571) [1] (662) [1] (91) [1]
Balance as of $ 2,135 [1] $ 2,797 [1]      
[1] (a) All amounts are net of tax. Amounts in parentheses indicate debits.