Summary of Unsecured Lines of Credit (Details) - USD ($)	1 Months Ended			12 Months Ended
	Nov. 30, 2016	Oct. 31, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Feb. 29, 2016
Line Of Credit Facility [Line Items]
Lines of credit				$ 40,000,000	$ 17,497,000
Unsecured Lines of Credit [Member]
Line Of Credit Facility [Line Items]
Lines of credit				40,000,000	17,497,000
Line of credit facility maximum borrowing capacity				47,500,000	47,500,000
Unsecured Lines of Credit [Member] | Bankers Trust [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity				$ 50,000,000
Debt instrument, maturity date	May 31, 2018	May 31, 2017		Sep. 30, 2017
Unsecured Lines of Credit [Member] | Bankers Trust Operating [Member]
Line Of Credit Facility [Line Items]
Lines of credit				$ 0
Line of credit facility maximum borrowing capacity			$ 7,500,000			$ 5,000,000
Debt instrument, maturity date	Mar. 31, 2018		Mar. 31, 2017
Unsecured Lines of Credit [Member] | Five Points Bank operating [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity				5,000,000
Unsecured Lines of Credit [Member] | 3.13% Interest Bearing Line of Credit [Member] | Bankers Trust [Member]
Line Of Credit Facility [Line Items]
Lines of credit				40,000,000
Line of credit facility maximum borrowing capacity				$ 40,000,000
Debt instrument, maturity date				May 31, 2018
Variable / Fixed				Variable
Reset Frequency				Monthly
Line of credit facility, interest rate during period				3.13%
Unsecured Lines of Credit [Member] | 3.88% Interest Bearing Line of Credit [Member] | Bankers Trust Operating [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity				$ 7,500,000
Debt instrument, maturity date				May 31, 2018
Variable / Fixed				Variable
Reset Frequency				Monthly
Line of credit facility, interest rate during period				3.88%
Unsecured Lines of Credit [Member] | 2.90% Interest Bearing Line of Credit [Member] | Bankers Trust [Member]
Line Of Credit Facility [Line Items]
Lines of credit					12,497,000
Line of credit facility maximum borrowing capacity					$ 37,500,000
Debt instrument, maturity date					May 31, 2017
Variable / Fixed					Variable
Reset Frequency					Monthly
Line of credit facility, interest rate during period					2.90%
Unsecured Lines of Credit [Member] | 3.5% Interest Bearing Line of Credit [Member] | Bankers Trust Operating [Member]
Line Of Credit Facility [Line Items]
Line of credit facility maximum borrowing capacity					$ 5,000,000
Debt instrument, maturity date					Mar. 31, 2016
Variable / Fixed					Variable
Reset Frequency					Monthly
Line of credit facility, interest rate during period					3.50%
Unsecured Lines of Credit [Member] | 3.4% Interest Bearing Line of Credit [Member] | Five Points Bank operating [Member]
Line Of Credit Facility [Line Items]
Lines of credit					$ 5,000,000
Line of credit facility maximum borrowing capacity					$ 5,000,000
Debt instrument, maturity date					Mar. 31, 2016
Variable / Fixed					Variable
Reset Frequency					Monthly
Line of credit facility, interest rate during period					3.40%