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Fair Value of Financial Instruments - Schedule of Estimated Fair Value and Related Carrying or Notional Amounts of Company's Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets:    
Investment securities available-for-sale $ 169,110 $ 135,754
Investment securities held-to-maturity 40,220  
Carrying Amount [Member]
   
Assets:    
Cash and cash equivalents 41,443 47,720
Investment securities available-for-sale 169,110 135,754
Investment securities held-to-maturity 40,835 35,050
Federal Home Loan Bank stock 738 906
Loans, net of allowance for loan losses 272,086 300,927
Other assets - derivatives 69  
Liabilities:    
Deposits 483,254 484,279
Short-term borrowings 623 1,231
Long-term debt 5,000 5,000
Estimated Fair Value [Member]
   
Assets:    
Cash and cash equivalents 41,443 47,720
Investment securities available-for-sale 169,110 135,754
Investment securities held-to-maturity 40,220 33,365
Federal Home Loan Bank stock 738 906
Loans, net of allowance for loan losses 273,992 303,291
Other assets - derivatives 69  
Liabilities:    
Deposits 483,733 484,957
Short-term borrowings 623 1,231
Long-term debt 5,013 5,011
Level 1 [Member]
   
Assets:    
Cash and cash equivalents 41,443 47,720
Investment securities available-for-sale 0  
Investment securities held-to-maturity 0  
Federal Home Loan Bank stock 0  
Loans, net of allowance for loan losses 0  
Other assets - derivatives 0  
Liabilities:    
Deposits 0  
Short-term borrowings 0  
Long-term debt 0  
Level 2 [Member]
   
Assets:    
Cash and cash equivalents 0  
Investment securities available-for-sale 169,110 135,754
Investment securities held-to-maturity 40,220 33,365
Federal Home Loan Bank stock 0  
Loans, net of allowance for loan losses 0  
Other assets - derivatives 69  
Liabilities:    
Deposits 483,733 484,957
Short-term borrowings 623 1,231
Long-term debt 5,013 5,011
Level 3 [Member]
   
Assets:    
Cash and cash equivalents 0  
Investment securities available-for-sale 0  
Investment securities held-to-maturity 0  
Federal Home Loan Bank stock 738 906
Loans, net of allowance for loan losses 273,992 303,291
Other assets - derivatives 0  
Liabilities:    
Deposits 0  
Short-term borrowings 0  
Long-term debt $ 0