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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements of Comprehensive Income |  |  |
Net unrealized holding gains (losses) on securities available for sale arising during period, tax effects | $ 35,960 | $ (11,300) | $ 29,863
Reclassification adjustment for gains on securities available for sale included in net income, tax effects | (6,050) | (11,623) | (4,185)
Reclassification adjustment for impairment charges on available for sale securities included in net income, tax effects | $ 342 | $ 2,946 | $ 0

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