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Borrowings (Summary Of Short-Term Borrowings) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 741,124 $ 807,820
Federal funds purchased 70,000 140,000
Subordinated notes 133,877 135,318
Short-term borrowings $ 945,001 $ 1,083,138