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Fair Value Measurements and Disclosure, Part III (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Impairment of real estate $ 0 $ 0 $ 188,000
Fair value, measurements, nonrecurring      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Real estate mortgage 389,000    
Fair value, measurements, nonrecurring | Mortgages | Fair Value of Collateral Method for Collateral Dependent Loans | Significant Unobservable Inputs Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Real estate mortgage $ 389,000    
Measurement Input, Discount Rate [Member] | Weighted average | Significant Unobservable Inputs Level 3 | Junior Subordinated Debt      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Weighted average inputs (percent) 0.0586    
Measurement Input, Discount Rate [Member] | Fair value, measurements, recurring | Weighted average | Significant Unobservable Inputs Level 3 | Junior Subordinated Debt      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Weighted average inputs (percent)   0.0581  
Adjustment Percentage | Fair value, measurements, nonrecurring | Mortgages | Fair Value of Collateral Method for Collateral Dependent Loans | Significant Unobservable Inputs Level 3      
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)      
Real estate mortgage, adjustment percentage 0.0943