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Income Tax, Components of Deferred Tax Asset and Liability (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets, Gross [Abstract]      
Deferred Tax Asset, Allowance For Loan Loss $ 1,203 $ 1,195  
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross 1,262 190  
Deferred Tax Assets, Other 135 216  
Deferred Tax Assets, Gross 2,600 1,601  
Deferred Tax Liabilities [Abstract]      
Deferred Tax Liabilities, Property, Plant and Equipment 280 241  
Deferred Tax Liabilities, Originated Mortgage Servicing Rights 362 413  
Deferred Tax Liabilities, Other 168 158  
Deferred Income Tax Liabilities, Gross, Total 810 812  
Deferred Tax Assets (Liabilities), Net $ 1,790 $ 789 $ 1,280