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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financial Assets |  |  |
Securities available for sale | $ 88,323 | $ 105,559 | [1]
Securities held to maturity | 55,263 | 66,519 | [1]
Restricted securities | 1,548 | 1,391 | [1]
Bank owned life insurance | 13,808 | 11,742 | [1]
Accrued interest receivable | 1,631 | 1,661 | [1]
Carrying Amount [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments | 56,857 | 39,334 |
Securities available for sale | 88,323 | 105,559 |
Securities held to maturity | 55,263 | 66,519 |
Restricted securities | 1,548 | 1,391 |
Loans held for sale | 1,053 | 323 |
Loans, net | 465,224 | 433,475 |
Bank owned life insurance | 13,808 | 11,742 |
Accrued interest receivable | 1,631 | 1,661 |
Financial Liabilities |  |  |
Deposits | 640,742 | 627,116 |
Subordinated debt | 4,926 | 4,913 |
Junior subordinated debt | 9,279 | 9,279 |
Accrued interest payable | 91 | 117 |
Fair Value [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments | 56,857 | 39,334 |
Securities available for sale | 88,323 | 105,559 |
Securities held to maturity | 56,305 | 66,438 |
Restricted securities | 1,548 | 1,391 |
Loans held for sale | 1,053 | 323 |
Loans, net | 471,778 | 438,392 |
Bank owned life insurance | 13,808 | 11,742 |
Accrued interest receivable | 1,631 | 1,661 |
Financial Liabilities |  |  |
Deposits | 640,699 | 626,321 |
Subordinated debt | 4,986 | 4,913 |
Junior subordinated debt | 8,109 | 8,141 |
Accrued interest payable | 91 | 117 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member] |  |  |
Financial Assets |  |  |
Cash and short-term investments | 56,857 | 39,334 |
Securities available for sale | 11 | 8 |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |  |
Financial Assets |  |  |
Securities available for sale | 88,312 | 105,551 |
Securities held to maturity | 54,781 | 64,938 |
Restricted securities | 1,548 | 1,391 |
Loans held for sale | 1,053 | 323 |
Bank owned life insurance | 13,808 | 11,742 |
Accrued interest receivable | 1,631 | 1,661 |
Financial Liabilities |  |  |
Deposits | 509,088 | 486,015 |
Accrued interest payable | 91 | 117 |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member] |  |  |
Financial Assets |  |  |
Securities held to maturity | 1,524 | 1,500 |
Loans, net | 471,778 | 438,392 |
Financial Liabilities |  |  |
Deposits | 131,611 | 140,306 |
Subordinated debt | 4,986 | 4,913 |
Junior subordinated debt | $ 8,109 | $ 8,141 |
[1] | Derived from audited consolidated financial statements.

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