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Composition of Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Federal funds purchased   $ 16,000
Securities sold under agreements to repurchase:    
Securities sold under agreements to repurchase 120,159 118,308
FHLB borrowings 150,000 150,000
Subordinated debt 15,464 15,464
Other debt 623 624
Total borrowings 286,246 300,396
Retail
   
Securities sold under agreements to repurchase:    
Securities sold under agreements to repurchase 70,159 68,308
Wholesale
   
Securities sold under agreements to repurchase:    
Securities sold under agreements to repurchase $ 50,000 $ 50,000