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Fair Value Measurements and Fair Value of Financial Instruments, Fair Value Inputs, Assets, Quantitative Information (Details) - Nonrecurring [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value $ 1,844 $ 1,386
Foreclosed Real Estate [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value 905 799
Appraisal of Collateral [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value [1] $ 1,308 $ 845
Appraisal of Collateral [Member] | Impaired Loans [Member] | Minimum [Member]    
Fair value inputs [Abstract]    
Appraisal adjustments [1],[2] 26.58% 25.00%
Liquidation expenses [1],[3] 4.09% 3.45%
Appraisal of Collateral [Member] | Impaired Loans [Member] | Maximum [Member]    
Fair value inputs [Abstract]    
Appraisal adjustments [1],[2] 31.86% 42.52%
Liquidation expenses [1],[3] 7.26% 7.38%
Appraisal of Collateral [Member] | Impaired Loans [Member] | Weighted Average [Member]    
Fair value inputs [Abstract]    
Appraisal adjustments [1],[2] 28.35% 28.46%
Liquidation expenses [1],[3] 5.10% 5.93%
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value [1] $ 905 $ 799
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member] | Minimum [Member]    
Fair value inputs [Abstract]    
Appraisal adjustments [1],[2] 0.00% 0.00%
Liquidation expenses [1],[3] 7.68% 11.64%
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member] | Maximum [Member]    
Fair value inputs [Abstract]    
Appraisal adjustments [1],[2] 0.00% 0.00%
Liquidation expenses [1],[3] 11.53% 17.92%
Appraisal of Collateral [Member] | Foreclosed Real Estate [Member] | Weighted Average [Member]    
Fair value inputs [Abstract]    
Appraisal adjustments [1],[2] 0.00% 0.00%
Liquidation expenses [1],[3] 8.36% 16.29%
Discounted Cash Flow [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value [1] $ 536 $ 541
Discounted Cash Flow [Member] | Impaired Loans [Member] | Minimum [Member]    
Fair value inputs [Abstract]    
Discount rate 4.19% 4.19%
Discounted Cash Flow [Member] | Impaired Loans [Member] | Maximum [Member]    
Fair value inputs [Abstract]    
Discount rate 6.63% 6.63%
Discounted Cash Flow [Member] | Impaired Loans [Member] | Weighted Average [Member]    
Fair value inputs [Abstract]    
Discount rate 5.36% 5.36%
[1] Fair value is generally determined through independent third-party appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable.
[2] Appraisals may be adjusted downwards by management for qualitative factors such as economic conditions. Higher downward adjustments are caused by negative changes to the collateral or conditions in the real estate market, actual offers or sales contracts received or age of the appraisal.
[3] Appraisals are adjusted downwards by management for qualitative factors such as the estimated costs to liquidate the collateral.