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Federal Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets: |  |
Allowance for loan losses | $ 1,464 | $ 2,326
Other | 399 | 553
Net unrealized gain on available- for-sale securities | 581 | 1,016
Total deferred tax assets | 2,444 | 3,895
Deferred Tax Liabilities: |  |
Accreted discounts on bonds | 55 | 83
FHLB stock dividends | 462 | 744
Mortgage servicing rights | 490 | 752
Other | 1,185 | 1,745
Net unrealized gain on available- for-sale securities | 0 | 0
Total deferred tax liabilities | 2,192 | 3,324
Net Deferred Tax Asset | $ 252 | $ 571

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