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Income Taxes - Net Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets |  |
Allowance for loan losses | $ 1,118 | $ 1,809
Securities available for sale | 281 | 447
Accrued pension | 0 | 689
Accrued health insurance | 11 | 0
Core deposit intangible | 317 | 371
Unvested stock-based compensation | 9 | 19
Limited partnership investments | 5 | 17
Loan origination fees, net | 63 | 48
Deferred tax assets, Total | 1,804 | 3,400
Deferred Tax Liabilities |  |
Depreciation | 562 | 708
Discount accretion | 0 | 2
Overfunded pension liability | 27 | 0
Deferred tax liabilities, Total | 589 | 710
Net deferred tax assets | $ 1,215 | $ 2,690

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