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Income Tax, Components of Deferred Tax Asset and Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Asset, Allowance For Loan Loss $ 1,195 $ 1,713  
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross 190 414  
Deferred Tax Assets, Other Real Estate Owned Write-downs 0 0  
Deferred Tax Assets, Tax Credit Carryforwards, Other 0 0  
Deferred Tax Assets, Other 216 316  
Deferred Tax Assets, Gross 1,601 2,443  
Deferred Tax Liabilities [Abstract]      
Deferred Tax Liabilities, Property, Plant and Equipment 241 205  
Deferred Tax Liabilities, Unrealized Gains on Available-for-Sale Securities, Gross 0 0  
Deferred Tax Liabilities, Originated Mortgage Servicing Rights 413 721  
Deferred Tax Liabilities, Other 158 237  
Deferred Income Tax Liabilities, Gross, Total 812 1,163  
Deferred Tax Assets (Liabilities), Net $ 789 $ 1,280 $ 195