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Disclosures About Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Jun. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities $ 70 $ 71
Agency mortgage-backed: residential [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities 70 71
Agency mortgage-backed: residential [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities
Agency mortgage-backed: residential [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities 70 71
Agency mortgage-backed: residential [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities