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Fair Value - Financial Assets Accounted for at Fair Value (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 0   $ 0   $ 27,000      
Schedule of Company's financial instruments measured at fair values                
Total Fair value 65,440,000   65,440,000   88,179,000      
Real Estate Acquired Through Foreclosure Fair Value         1,000      
Real Estate Owned, Valuation Allowance, Valuation Increase 17,000 $ 1,000 38,000 $ 27,000        
Other real estate owned at carrying value before valuation allowance 307,000   307,000   1,249,000      
Real Estate Owned, Valuation Allowance 38,000 $ 23,000 38,000 $ 23,000 23,000 $ 21,000 $ 44,000 $ 305,000
Certificates of deposit [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 52,996,000   52,996,000   73,507,000      
Equity Funds [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Residential Mortgage Backed Securities [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 8,780,000   8,780,000   10,478,000      
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 8,780,000   8,780,000          
Collateralized Debt Obligations [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 3,151,000   3,151,000   3,685,000      
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 3,151,000   3,151,000          
Municipal Bonds [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 513,000   513,000   509,000      
Nonrecurring [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 65,440,000   65,440,000   88,179,000      
Nonrecurring [Member] | Certificates of deposit [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 52,996,000   52,996,000   73,507,000      
Nonrecurring [Member] | Mortgage-backed securities - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 8,780,000   8,780,000   10,478,000      
Nonrecurring [Member] | Collateralized mortgage obligations - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 3,151,000   3,151,000   3,685,000      
Nonrecurring [Member] | Municipal Securities [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 513,000   513,000   509,000      
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Certificates of deposit [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-backed securities - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Collateralized mortgage obligations - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Municipal Securities [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 65,440,000   65,440,000   88,179,000      
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Certificates of deposit [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 52,996,000   52,996,000          
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Mortgage-backed securities - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 8,780,000   8,780,000          
Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member] | Collateralized mortgage obligations - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 3,151,000   3,151,000          
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Certificates of deposit [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage-backed securities - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collateralized mortgage obligations - residential [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Municipal Securities [Member]                
Schedule of Company's financial instruments measured at fair values                
Total Fair value 0   0   0      
One to Four Family Residential Real Estate Loans [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0   0   0      
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value 193,000   193,000          
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value 0   0          
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value 0   0          
One to Four Family Residential Real Estate Loans [Member] | Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value 193,000   193,000          
Commercial Real Estate [Member]                
Fair Value Measurement Inputs and Valuation Techniques [Line Items]                
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 0   $ 0   27,000      
Impaired Financing Receivable, with Related Allowance, Recorded Investment         270,000      
Land Loans [Member] | Nonrecurring [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value         1,000      
Land Loans [Member] | Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value         0      
Land Loans [Member] | Nonrecurring [Member] | Significant Observable Inputs (Level 2) [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value         0      
Land Loans [Member] | Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]                
Schedule of Company's financial instruments measured at fair values                
Real Estate Acquired Through Foreclosure Fair Value         $ 1,000      
Sales Comparison Valuation Technique [Member] | Real Estate [Member]                
Schedule of Company's financial instruments measured at fair values                
Fair Value Measurements, Valuation Processes, Description     Sales comparison   Sales comparison      
Sales Comparison Valuation Technique [Member] | One to Four Family Residential Real Estate Loans [Member]                
Schedule of Company's financial instruments measured at fair values                
Fair Value Measurements, Sensitivity Analysis, Description     Discount applied to valuation   Discount applied to valuation      
Impaired Loans [Member] | Sales Comparison Valuation Technique [Member] | Land Loans [Member]                
Schedule of Company's financial instruments measured at fair values                
Real estate owned, measurement input 0.160   0.160   0.123      
Measurement Input, Comparability Adjustment [Member] | Maximum [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]                
Schedule of Company's financial instruments measured at fair values                
Real estate owned, measurement input         0.1522      
Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] | Real Estate Properties [Domain] | Nonresidential Real Estate [Member]                
Schedule of Company's financial instruments measured at fair values                
Real estate owned, measurement input         0.1100      
Land [Member]                
Schedule of Company's financial instruments measured at fair values                
Other real estate owned at carrying value before valuation allowance $ 0   $ 0   $ 24,000      
Real Estate Owned, Valuation Allowance $ 0   $ 0   $ 23,000