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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, 2014 | Dec. 31, 2013
--- | --- | ---
Financial Assets |  |
Securities | $ 108,884 | $ 103,301
Restricted securities | 1,636 | 1,804
Bank owned life insurance | 11,141 | 10,978
Accrued interest receivable | 1,258 | 1,302
Carrying Amount [Member] |  |
Financial Assets |  |
Cash and short-term investments | 19,322 | 31,508
Securities | 108,884 | 103,301
Restricted securities | 1,636 | 1,804
Loans, net | 357,484 | 346,449
Bank owned life insurance | 11,141 | 10,978
Accrued interest receivable | 1,258 | 1,302
Financial Liabilities |  |
Deposits | 451,198 | 450,711
Other borrowings | 6,039 | 6,052
Trust preferred capital notes | 9,279 | 9,279
Accrued interest payable | 151 | 177
Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments | 19,322 | 31,508
Securities | 108,884 | 103,301
Restricted securities | 1,636 | 1,804
Loans, net | 365,034 | 353,874
Bank owned life insurance | 11,141 | 10,978
Accrued interest receivable | 1,258 | 1,302
Financial Liabilities |  |
Deposits | 451,504 | 451,377
Other borrowings | 6,137 | 6,095
Trust preferred capital notes | 10,351 | 9,399
Accrued interest payable | 151 | 177
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments | 19,322 | 31,508
Securities | 6 | 5
Restricted securities |  |
Loans, net |  |
Bank owned life insurance |  |
Accrued interest receivable |  |
Financial Liabilities |  |
Deposits |  |
Other borrowings |  |
Trust preferred capital notes |  |
Accrued interest payable |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments |  |
Securities | 108,878 | 103,296
Restricted securities | 1,636 | 1,804
Loans, net |  |
Bank owned life insurance | 11,141 | 10,978
Accrued interest receivable | 1,258 | 1,302
Financial Liabilities |  |
Deposits | 335,325 | 326,955
Other borrowings |  |
Trust preferred capital notes |  |
Accrued interest payable | 151 | 177
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |
Financial Assets |  |
Cash and short-term investments |  |
Securities |  |
Restricted securities |  |
Loans, net | 365,034 | 353,874
Bank owned life insurance |  |
Accrued interest receivable |  |
Financial Liabilities |  |
Deposits | 116,179 | 124,422
Other borrowings | 6,137 | 6,095
Trust preferred capital notes | 10,351 | 9,399
Accrued interest payable |  |

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