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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets |  |  |
Securities available for sale, at fair value | $ 89,741 | $ 94,802 | [1]
Securities held to maturity | 50,824 | 53,398 | [1]
Restricted securities | 1,570 | 1,548 | [1]
Bank owned life insurance | 14,115 | 13,928 | [1]
Accrued interest receivable | 1,728 | 1,746 | [1]
Carrying Amount |  |  |
Financial Assets |  |  |
Cash and short-term investments | 50,738 | 41,092 |
Securities available for sale, at fair value | 89,741 | 94,802 |
Securities held to maturity | 50,824 | 53,398 |
Restricted securities | 1,570 | 1,548 |
Loans held for sale | 999 | 337 |
Loans, net | 498,389 | 480,746 |
Bank owned life insurance | 14,115 | 13,928 |
Accrued interest receivable | 1,728 | 1,746 |
Financial Liabilities |  |  |
Deposits | 661,828 | 645,570 |
Subordinated debt | 4,939 | 4,930 |
Junior subordinated debt | 9,279 | 9,279 |
Accrued interest payable | 87 | 95 |
Fair Value |  |  |
Financial Assets |  |  |
Cash and short-term investments | 50,738 | 41,092 |
Securities available for sale, at fair value | 89,741 | 94,802 |
Securities held to maturity | 51,001 | 52,709 |
Restricted securities | 1,570 | 1,548 |
Loans held for sale | 999 | 337 |
Loans, net | 499,030 | 481,475 |
Bank owned life insurance | 14,115 | 13,928 |
Accrued interest receivable | 1,728 | 1,746 |
Financial Liabilities |  |  |
Deposits | 660,706 | 644,322 |
Subordinated debt | 4,753 | 4,715 |
Junior subordinated debt | 9,472 | 9,075 |
Accrued interest payable | 87 | 95 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value |  |  |
Financial Assets |  |  |
Cash and short-term investments | 50,738 | 41,092 |
Securities available for sale, at fair value | 12 | 11 |
Securities held to maturity | 0 | 0 |
Restricted securities | 0 | 0 |
Loans held for sale | 0 | 0 |
Loans, net | 0 | 0 |
Bank owned life insurance | 0 | 0 |
Accrued interest receivable | 0 | 0 |
Financial Liabilities |  |  |
Deposits | 0 | 0 |
Subordinated debt | 0 | 0 |
Junior subordinated debt | 0 | 0 |
Accrued interest payable | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Fair Value |  |  |
Financial Assets |  |  |
Cash and short-term investments | 0 | 0 |
Securities available for sale, at fair value | 89,729 | 94,791 |
Securities held to maturity | 49,511 | 51,223 |
Restricted securities | 1,570 | 1,548 |
Loans held for sale | 999 | 337 |
Loans, net | 0 | 0 |
Bank owned life insurance | 14,115 | 13,928 |
Accrued interest receivable | 1,728 | 1,746 |
Financial Liabilities |  |  |
Deposits | 538,908 | 517,143 |
Subordinated debt | 0 | 0 |
Junior subordinated debt | 0 | 0 |
Accrued interest payable | 87 | 95 |
Significant Unobservable Inputs (Level 3) | Fair Value |  |  |
Financial Assets |  |  |
Cash and short-term investments | 0 | 0 |
Securities available for sale, at fair value | 0 | 0 |
Securities held to maturity | 1,490 | 1,486 |
Restricted securities | 0 | 0 |
Loans held for sale | 0 | 0 |
Loans, net | 499,030 | 481,475 |
Bank owned life insurance | 0 | 0 |
Accrued interest receivable | 0 | 0 |
Financial Liabilities |  |  |
Deposits | 121,798 | 127,179 |
Subordinated debt | 4,753 | 4,715 |
Junior subordinated debt | 9,472 | 9,075 |
Accrued interest payable | $ 0 | $ 0 |
[1] | Derived from audited consolidated financial statements.

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