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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Comprehensive Income      
Net income $ 107,835 $ 127,149 $ 130,023
Other comprehensive income (loss), net of tax:      
Net unrealized holding gains (losses) on securities available for sale arising during period (net of tax effects of $2,701, $35,960, and $(11,300)) 5,018 66,782 (20,985)
Reclassification adjustment for gains on securities available for sale included in net income (net of tax effects of $(13,456), $(6,050), and $(11,623)) (24,990) (11,235) (21,586)
Reclassification adjustment for impairment charges on available for sale securities included in net income (net of tax effects of $364, $342, and $2,946) 675 635 5,470
Other comprehensive income, net of tax (19,297) 56,182 (37,101)
Comprehensive income $ 88,538 $ 183,331 $ 92,922