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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
Sep. 30, 2013
Dec. 31, 2012
Financial Assets    
Securities $ 105,321 $ 89,456
Bank owned life insurance 9,213 9,014
Carrying Amount [Member]
    
Financial Assets    
Cash and short-term investments 37,870 31,028
Securities 105,321 89,456
Loans held for sale   503
Loans, net 354,952 370,519
Bank owned life insurance 9,213 9,014
Accrued interest receivable 1,339 1,459
Financial Liabilities    
Deposits 471,263 466,917
Other borrowings 6,058 6,076
Trust preferred capital notes 9,279 9,279
Accrued interest payable 232 286
Fair Value [Member]
    
Financial Assets    
Cash and short-term investments 37,870 31,028
Securities 105,321 89,456
Loans held for sale   503
Loans, net 362,967 375,941
Bank owned life insurance 9,213 9,014
Accrued interest receivable 1,339 1,459
Financial Liabilities    
Deposits 472,238 468,870
Other borrowings 5,821 6,220
Trust preferred capital notes 8,738 8,735
Accrued interest payable 232 286
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]
    
Financial Assets    
Cash and short-term investments 37,870 31,028
Securities 5 3
Financial Liabilities    
Deposits     
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]
    
Financial Assets    
Securities 105,316 89,453
Loans held for sale   503
Bank owned life insurance 9,213 9,014
Accrued interest receivable 1,339 1,459
Financial Liabilities    
Deposits 325,598 306,719
Accrued interest payable 232 286
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]
    
Financial Assets    
Loans, net 362,967 375,941
Financial Liabilities    
Deposits 146,640 162,151
Other borrowings 5,821 6,220
Trust preferred capital notes $ 8,738 $ 8,735