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Fair Value Measurements - Summary of Assets Measured at Fair Value on a Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets    
Impaired loans, net $ 2,311 $ 7,944
Other real estate owned, net 4,084 5,590
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Assets    
Impaired loans, net     
Other real estate owned, net     
Significant Other Observable Inputs (Level 2) [Member]
    
Assets    
Impaired loans, net     
Other real estate owned, net     
Significant Unobservable Inputs (Level 3) [Member]
    
Assets    
Impaired loans, net 2,311 7,944
Other real estate owned, net $ 4,084 $ 5,590