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Borrowed Funds - Schedule of Short-Term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Total short-term borrowings $ 281,455 $ 154,323
Short-term borrowings [Member]
   
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase 231,455 154,323
Federal funds purchased 50,000  
Total short-term borrowings $ 281,455 $ 154,323