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Fair Value - Assets Measured at Fair Value on a Non-Recurring Basis (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Other Real Estate $ 0   $ 0   $ 1,200,000
Real Estate Owned, Valuation Allowance, Component         261,000
Other Real Estate Owned Write Downs $ 1,000 $ 54,000 $ 26,000 $ 74,000  
One-to-four family residential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Other Real Estate         102,000
Nonrecurring [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         916,000
Nonrecurring [Member] | One-to-four family residential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         102,000
Nonrecurring [Member] | Nonresidential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         814,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | One-to-four family residential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         0
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonresidential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | One-to-four family residential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         0
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Nonresidential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Fair Value, Other real estate owned         916,000
Sales Comparison Valuation Technique [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Other Real Estate         $ 916,000
Impaired Loans [Member] | Sales Comparison Valuation Technique [Member] | Nonresidential real estate loans [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Real estate owned, measurement input         0.056
Measurement Input, Comparability Adjustment [Member] | Nonresidential Real Estate [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Other Real Estate         $ 814,000
Measurement Input, Comparability Adjustment [Member] | Maximum [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Real estate owned, measurement input         0.1522
Measurement Input, Comparability Adjustment [Member] | Minimum [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Real estate owned, measurement input         (0.0366)
Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]          
Fair Value Measurement Inputs and Valuation Techniques [Line Items]          
Real estate owned, measurement input         0.1100