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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financial Assets    
Securities $ 105,163 $ 89,456
Bank owned life insurance 9,144 9,014
Carrying Amount [Member]
    
Financial Assets    
Cash and short-term investments 31,149 31,028
Securities 105,163 89,456
Loans held for sale   503
Loans, net 365,035 370,519
Bank owned life insurance 9,144 9,014
Accrued interest receivable 1,425 1,459
Financial Liabilities    
Deposits 475,958 466,917
Other borrowings 6,064 6,076
Trust preferred capital notes 9,279 9,279
Accrued interest payable 254 286
Fair Value [Member]
    
Financial Assets    
Cash and short-term investments 31,149 31,028
Securities 105,163 89,456
Loans held for sale   503
Loans, net 370,775 375,941
Bank owned life insurance 9,144 9,014
Accrued interest receivable 1,425 1,459
Financial Liabilities    
Deposits 477,261 468,870
Other borrowings 5,837 6,220
Trust preferred capital notes 8,738 8,735
Accrued interest payable 254 286
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
    
Financial Assets    
Cash and short-term investments 31,149 31,028
Securities 3 3
Bank owned life insurance 9,144 9,014
Accrued interest receivable 1,425 1,459
Financial Liabilities    
Deposits 324,709 306,719
Accrued interest payable 254 286
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
    
Financial Assets    
Securities 105,160 89,453
Loans held for sale   503
Financial Liabilities    
Other borrowings     
Trust preferred capital notes     
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
    
Financial Assets    
Loans, net 370,775 375,941
Financial Liabilities    
Deposits 152,552 162,151
Other borrowings 5,837 6,220
Trust preferred capital notes $ 8,738 $ 8,735