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Fair Value Measurements - Carrying Values and Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets |  |
Securities available for sale, at fair value | $ 89,255 | $ 94,802
Securities held to maturity | 48,208 | 53,398
Restricted securities | 1,570 | 1,548
Bank owned life insurance | 13,967 | 13,928
Accrued interest receivable | 1,916 | 1,746
Carrying Amount |  |
Financial Assets |  |
Cash and short-term investments | 39,986 | 41,092
Securities available for sale, at fair value | 89,255 | 94,802
Securities held to maturity | 48,208 | 53,398
Restricted securities | 1,570 | 1,548
Loans held for sale | 438 | 337
Loans, net | 516,875 | 480,746
Bank owned life insurance | 13,967 | 13,928
Accrued interest receivable | 1,916 | 1,746
Financial Liabilities |  |
Deposits | 664,980 | 645,570
Subordinated debt | 4,948 | 4,930
Junior subordinated debt | 9,279 | 9,279
Accrued interest payable | 98 | 95
Fair Value |  |
Financial Assets |  |
Cash and short-term investments | 39,986 | 41,092
Securities available for sale, at fair value | 89,255 | 94,802
Securities held to maturity | 47,702 | 52,709
Restricted securities | 1,570 | 1,548
Loans held for sale | 438 | 337
Loans, net | 514,013 | 481,475
Bank owned life insurance | 13,967 | 13,928
Accrued interest receivable | 1,916 | 1,746
Financial Liabilities |  |
Deposits | 663,163 | 644,322
Subordinated debt | 5,004 | 4,715
Junior subordinated debt | 9,653 | 9,075
Accrued interest payable | 98 | 95
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value |  |
Financial Assets |  |
Cash and short-term investments | 39,986 | 41,092
Securities available for sale, at fair value | 0 | 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 | 89,255 | 94,791
Securities held to maturity | 46,186 | 51,223
Restricted securities | 1,570 | 1,548
Loans held for sale | 438 | 337
Loans, net | 0 | 0
Bank owned life insurance | 13,967 | 13,928
Accrued interest receivable | 1,916 | 1,746
Financial Liabilities |  |
Deposits | 542,329 | 517,143
Subordinated debt | 0 | 0
Junior subordinated debt | 0 | 0
Accrued interest payable | 98 | 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 | 1,516 | 1,486
Restricted securities | 0 | 0
Loans held for sale | 0 | 0
Loans, net | 514,013 | 481,475
Bank owned life insurance | 0 | 0
Accrued interest receivable | 0 | 0
Financial Liabilities |  |
Deposits | 120,834 | 127,179
Subordinated debt | 5,004 | 4,715
Junior subordinated debt | 9,653 | 9,075
Accrued interest payable | $ 0 | $ 0

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