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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Assets |  |  |
Securities available for sale, at fair value | $ 93,699 | $ 89,255 | [1]
Securities held to maturity | 46,791 | 48,208 | [1]
Restricted securities | 1,590 | 1,570 | [1]
Bank owned life insurance | 13,711 | 13,967 | [1]
Accrued interest receivable | 1,869 | 1,916 | [1]
Carrying Amount |  |  |
Financial Assets |  |  |
Cash and short-term investments | 69,277 | 39,986 |
Securities available for sale, at fair value | 93,699 | 89,255 |
Securities held to maturity | 46,791 | 48,208 |
Restricted securities | 1,590 | 1,570 |
Loans held for sale | 68 | 438 |
Loans, net | 515,664 | 516,875 |
Bank owned life insurance | 13,711 | 13,967 |
Accrued interest receivable | 1,869 | 1,916 |
Financial Liabilities |  |  |
Deposits | 692,825 | 664,980 |
Subordinated debt | 4,952 | 4,948 |
Junior subordinated debt | 9,279 | 9,279 |
Accrued interest payable | 106 | 98 |
Fair Value |  |  |
Financial Assets |  |  |
Cash and short-term investments | 69,277 | 39,986 |
Securities available for sale, at fair value | 93,699 | 89,255 |
Securities held to maturity | 45,630 | 47,702 |
Restricted securities | 1,590 | 1,570 |
Loans held for sale | 68 | 438 |
Loans, net | 515,058 | 514,013 |
Bank owned life insurance | 13,711 | 13,967 |
Accrued interest receivable | 1,869 | 1,916 |
Financial Liabilities |  |  |
Deposits | 690,385 | 663,163 |
Subordinated debt | 4,884 | 5,004 |
Junior subordinated debt | 9,357 | 9,653 |
Accrued interest payable | 106 | 98 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value |  |  |
Financial Assets |  |  |
Cash and short-term investments | 69,277 | 39,986 |
Securities available for sale, at fair value | 0 | 0 |
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 | 93,699 | 89,255 |
Securities held to maturity | 44,133 | 46,186 |
Restricted securities | 1,590 | 1,570 |
Loans held for sale | 68 | 438 |
Loans, net | 0 | 0 |
Bank owned life insurance | 13,711 | 13,967 |
Accrued interest receivable | 1,869 | 1,916 |
Financial Liabilities |  |  |
Deposits | 567,790 | 542,329 |
Subordinated debt | 0 | 0 |
Junior subordinated debt | 0 | 0 |
Accrued interest payable | 106 | 98 |
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 | 1,497 | 1,516 |
Restricted securities | 0 | 0 |
Loans held for sale | 0 | 0 |
Loans, net | 515,058 | 514,013 |
Bank owned life insurance | 0 | 0 |
Accrued interest receivable | 0 | 0 |
Financial Liabilities |  |  |
Deposits | 122,595 | 120,834 |
Subordinated debt | 4,884 | 5,004 |
Junior subordinated debt | 9,357 | 9,653 |
Accrued interest payable | $ 0 | $ 0 |
[1] | Derived from audited consolidated financial statements.

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