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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

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