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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Comprehensive Income      
Unrealized gain (loss) during the period on available-for-sale securities, tax expense $ 471 $ 1,964 $ 564
Reclassification adjustment for gain included in net income, tax (expense) benefit 9 201 289
Reclassification adjustment for other-than-temporary-impairment on securities, tax benefit $ 68 $ 104 $ 546