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Loans - Recorded Investment in Those Classes Based on Payment Activity and Assigned Risk Grading (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Consumer Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net $ 92,438 $ 80,287
Consumer Real Estate [Member] | Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net 92,226 79,766
Consumer Real Estate [Member] | 5 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net      
Consumer Real Estate [Member] | 6 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net 18 110
Consumer Real Estate [Member] | 7 [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net 194 411
Consumer - Credit [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net 3,721 3,473
Consumer - Credit [Member] | Performing [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net 3,721 3,470
Consumer - Credit [Member] | Nonperforming [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net   3
Consumer - Other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net 17,455 16,807
Consumer - Other [Member] | Performing [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net 17,425 16,775
Consumer - Other [Member] | Nonperforming [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Net $ 30 $ 32