Guarantees, Commitments and Contingencies - Summary of Commitments and Contingent Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Summary Of Commitments And Contingent Liabilities [Line Items]    
Commitments and contingent liabilities      
Standby Letters of Credit [Member]
   
Summary Of Commitments And Contingent Liabilities [Line Items]    
Commitments and contingent liabilities 931 1,092
Commitments to Extend Credit [Member]
   
Summary Of Commitments And Contingent Liabilities [Line Items]    
Commitments and contingent liabilities $ 28,875 $ 32,123