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Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Balance at beginning of period | $ 5,474 | $ 7,088 | $ 7,940 | $ 7,401
Unrealized gains (losses) arising during the period | (16,410) | 2,118 | (12,915) | 2,159
Reclassification of realized gains during the period | (1,087) | (1,444) | (788) | (1,967)
Related deferred taxes | (6,124) | 236 | (4,796) | 67
Net change | (11,373) | 438 | (8,907) | 125
Balance at end of period | $ (3,433) | $ 7,526 | $ (3,433) | $ 7,526

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