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Borrowings - Summary of Short-Term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Securities sold under repurchase agreements $ 787,712 $ 841,741
Federal funds purchased 300,000 270,000
Subordinated notes 128,912 129,498
Short-term borrowings $ 1,216,624 $ 1,241,239