Fair Value Measurements, Quantitative Information (Details) - Market Comparables [Member] $ in Thousands	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]
Investments, Fair Value Disclosure [Abstract]
Fair Value	$ 240	$ 264
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member] | Selling Costs [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0725	0.0725
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member] | Liquidation Discount [Member] | Minimum [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement		0.0000
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member] | Liquidation Discount [Member] | Maximum [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement		0.0400
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member] | Liquidation Discount [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0400	0.0291
Mortgage Loans on Real Estate [Member] | Commercial [Member]
Investments, Fair Value Disclosure [Abstract]
Fair Value	$ 326
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Selling Costs [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0773
Mortgage Loans on Real Estate [Member] | Commercial [Member] | Liquidation Discount [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0764
Mortgage Loans on Real Estate [Member] | Construction [Member]
Investments, Fair Value Disclosure [Abstract]
Fair Value	$ 74	$ 74
Mortgage Loans on Real Estate [Member] | Construction [Member] | Selling Costs [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0725	0.0725
Mortgage Loans on Real Estate [Member] | Construction [Member] | Liquidation Discount [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0400	0.0400
Mortgage Loans on Real Estate [Member] | Equity Lines of Credit [Member]
Investments, Fair Value Disclosure [Abstract]
Fair Value	$ 229	$ 229
Mortgage Loans on Real Estate [Member] | Equity Lines of Credit [Member] | Selling Costs [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0669	0.0725
Mortgage Loans on Real Estate [Member] | Equity Lines of Credit [Member] | Liquidation Discount [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0369	0.0400
Other Real Estate [Member] | Construction [Member]
Investments, Fair Value Disclosure [Abstract]
Fair Value	$ 133
Other Real Estate [Member] | Construction [Member] | Selling Costs [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0725
Other Real Estate [Member] | Construction [Member] | Liquidation Discount [Member] | Weighted Average [Member]
Investments, Fair Value Disclosure [Abstract]
Fair value measurement	0.0400