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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net income $ 25,878 $ 30,631 $ 82,115 $ 96,776
Other comprehensive income (loss), net of tax        
Net unrealized holding gains on securities available for sale arising during period (net of tax effects of $10,897, $7,125, $11,292 and $39,003) 20,238 13,232 20,971 72,433
Reclassification adjustment for gains on securities available for sale included in net income (net of tax effects of $(11,527), $(2,306), $(12,434) and $(3,307) (21,408) (4,281) (23,093) (6,141)
Reclassification adjustment for impairment charges on available for sale securities included in net income (net of tax effects of $84, $100, $226 and $245) 155 186 421 456
Other comprehensive income, net of tax (1,015) 9,137 (1,701) 66,748
Comprehensive income $ 24,863 $ 39,768 $ 80,414 $ 163,524