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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 $ 281,650 $ 245,234 $ 164,564
Unrealized gains (losses) on investment securities available-for-sale:      
Unrealized holding gains (losses) arising during period 42,868 (12,333) 12,554
Reclassification adjustment for net gains included in net income (439) (5,628) (18,117)
Noncredit-related impairment loss on securities (2,938) (2,960) (8,966)
Foreign currency translation adjustments (900) (764) 1,693
Unrealized gains (losses) on other investments 31 194 (177)
Reclassification adjustment for net gains included in net income (13) (35)  
Other comprehensive income (loss) 38,609 (21,526) (13,013)
COMPREHENSIVE INCOME $ 320,259 $ 223,708 $ 151,551