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Federal Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Allowance for loan losses $ 2,326 $ 2,080
Other 553 528
Net unrealized gain on available- for-sale securities 1,016  
Total deferred tax assets 3,895 2,608
Allowance for loan losses 2,326 2,080
Other 553 528
Net unrealized gain on available- for-sale securities 1,016  
Total deferred tax assets 3,895 2,608
Accreted discounts on bonds 83 100
FHLB stock dividends 744 745
Mortgage servicing rights 752 706
Other 1,745 1,389
Net unrealized gain on available-for-sale securities   109
Total deferred tax liabilities 3,324 3,049
Net Deferred Tax Asset 571  
Accreted discounts on bonds 83 100
FHLB stock dividends 744 745
Mortgage servicing rights 752 706
Other 1,745 1,389
Net unrealized gain on available-for-sale securities   109
Total deferred tax liabilities $ 3,324 3,049
Net Deferred Tax Liability   $ (441)