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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, 2014 | Dec. 31, 2013
--- | --- | ---
Financial Assets |  |
Securities | $ 104,710 | $ 103,301
Restricted securities | 1,636 | 1,804
Bank owned life insurance | 11,244 | 10,978
Accrued interest receivable | 1,327 | 1,302
Carrying Amount [Member] |  |
Financial Assets |  |
Cash and short-term investments | 10,747 | 31,508
Securities | 104,710 | 103,301
Restricted securities | 1,636 | 1,804
Loans held for sale | 181 |
Loans, net | 364,974 | 346,449
Bank owned life insurance | 11,244 | 10,978
Accrued interest receivable | 1,327 | 1,302
Financial Liabilities |  |
Deposits | 438,919 | 450,711
Federal funds purchased | 5,325 |
Other borrowings | 6,033 | 6,052
Trust preferred capital notes | 9,279 | 9,279
Accrued interest payable | 143 | 177
Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments | 10,747 | 31,508
Securities | 104,710 | 103,301
Restricted securities | 1,636 | 1,804
Loans held for sale | 181 |
Loans, net | 371,773 | 353,874
Bank owned life insurance | 11,244 | 10,978
Accrued interest receivable | 1,327 | 1,302
Financial Liabilities |  |
Deposits | 438,822 | 451,377
Federal funds purchased | 5,325 |
Other borrowings | 6,093 | 6,095
Trust preferred capital notes | 10,028 | 9,399
Accrued interest payable | 143 | 177
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments | 10,747 | 31,508
Securities | 5 | 5
Financial Liabilities |  |
Federal funds purchased | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Securities | 104,705 | 103,296
Restricted securities | 1,636 | 1,804
Loans held for sale | 181 |
Bank owned life insurance | 11,244 | 10,978
Accrued interest receivable | 1,327 | 1,302
Financial Liabilities |  |
Deposits | 327,674 | 326,955
Federal funds purchased | 5,325 |
Accrued interest payable | 143 | 177
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Loans, net | 371,773 | 353,874
Financial Liabilities |  |
Deposits | 111,148 | 124,422
Federal funds purchased | 0 |
Other borrowings | 6,093 | 6,095
Trust preferred capital notes | $ 10,028 | $ 9,399

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