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Borrowed Funds (Securities Sold under Agreements to Repurchase with Corresponding Carrying and Market Values of Underlying Securities) (Detail) (Maturity over 90 Days [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Maturity over 90 Days [Member]
   
Assets Sold under Agreements to Repurchase [Line Items]    
Borrowing Amount $ 25,000 $ 25,000
Rate 2.98% 2.98%
Collateral Carrying Value 41,061 29,942
Collateral Fair Value 41,714 30,961
Collateral Accrued Interest $ 104 $ 97