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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
Sep. 30, 2014
Dec. 31, 2013
Assets:    
Investment securities available-for-sale $ 179,346 $ 135,754
Investment securities held-to-maturity 36,091  
Carrying Amount [Member]
   
Assets:    
Cash and cash equivalents 34,531 47,720
Investment securities available-for-sale 179,346 135,754
Investment securities held-to-maturity 36,524 35,050
Federal Home Loan Bank stock 738 906
Loans, net of allowance for loan losses 265,170 300,927
Other assets - derivatives 105  
Liabilities:    
Deposits 474,518 484,279
Short-term borrowings 755 1,231
Long-term debt 5,000 5,000
Estimated Fair Value [Member]
   
Assets:    
Cash and cash equivalents 34,531 47,720
Investment securities available-for-sale 179,346 135,754
Investment securities held-to-maturity 36,091 33,365
Federal Home Loan Bank stock 738 906
Loans, net of allowance for loan losses 264,393 303,291
Other assets - derivatives 105  
Liabilities:    
Deposits 474,412 484,957
Short-term borrowings 755 1,231
Long-term debt 5,009 5,011
Level 1 [Member]
   
Assets:    
Cash and cash equivalents 34,531 47,720
Level 2 [Member]
   
Assets:    
Investment securities available-for-sale 179,346 135,754
Investment securities held-to-maturity 36,091 33,365
Other assets - derivatives 105  
Liabilities:    
Deposits 474,412 484,957
Short-term borrowings 755 1,231
Long-term debt 5,009 5,011
Level 3 [Member]
   
Assets:    
Federal Home Loan Bank stock 738 906
Loans, net of allowance for loan losses $ 264,393 $ 303,291