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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Impairment of investments     $ 0    
Loan servicing assets, impairment     0 $ 0  
Servicing Assets $ 200,000   200,000 232,000  
Goodwill 11,331,000   11,331,000 11,331,000  
Goodwill, Impairment Loss     0 0 $ 0
Intangible Assets, Net (Excluding Goodwill) 462,000   462,000 612,000  
Finite-Lived Intangible Assets, Accumulated Amortization 883,000   $ 883,000 732,000  
Finite-Lived Intangible Assets, Amortization Method     sum-of-the-years digits method    
Finite-Lived Intangible Asset, Useful Life     10 years    
Amortization of Intangibles     $ 150,000 $ 122,000 $ 105,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00% 35.00% 34.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount 3,060,000   $ 3,060,000    
Unrecognized Tax Benefits 0   0 $ 0  
Unrecognized tax benefits expected within next twelve months $ 0   $ 0    
Scenario Forecast [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%