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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
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Balance at beginning of period     $ 7,940 $ 7,401 $ (3,433) $ 7,526
Unrealized gains (losses) arising during the period (17,609) 3,019 (1,199) 5,178    
Reclassification of realized gains during the period (1,087) 0 0 (1,967)    
Related deferred taxes (6,544) 1,057 (420) 1,124    
Net change (12,152) 1,962 (779) 2,087    
Balance at end of period $ (4,212) $ 9,488 $ (4,212) $ 9,488 $ (3,433) $ 7,526