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Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Balance at beginning of period | $ 7,940 | $ 7,401
Unrealized gains (losses) arising during the period | (3,495) | 42
Reclassification of realized gains during the period | (299) | (523)
Related deferred taxes | 1,328 | 168
Net change | (2,466) | (313)
Balance at end of period | $ 5,474 | $ 7,088

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