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Credit Quality Indicators (Details Textual) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable Recorded Investment [Line Items]    
Maximum commercial loan and commercial real estate relationships $ 750,000  
Residential real estate, 1-4 family residential    
Financing Receivable Recorded Investment [Line Items]    
Other real estate owned properties 0 $ 171,000
Other real estate properties in foreclosure $ 940,000 $ 336,000