Other Commitments and Contingencies and Derivatives - Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain/(Loss), Total $ (188) $ (232) $ 508
Derivative Loan Commitments [Member] | Mortgage Banking Gains, Net [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain/(Loss), Derivative loan commitments (275) (248) 536
Forward Loan Sale Commitments [Member] | Mortgage Banking Gains, Net [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain/(Loss), Forward loan sale commitments $ 87 $ 16 $ (28)