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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