Summary Of Term A/B Trust Financings (Details) - USD ($)	1 Months Ended
	Feb. 24, 2017	Dec. 31, 2016	Dec. 31, 2015
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing		$ 495,383,033	$ 451,496,716
Subsequent Event [Member] | San Vicente Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 3,150,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | San Vicente Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 1,555,000
Acquired	2017-02
Stated Maturity	2018-06
Base Interest Rate	3.76%
Subsequent Event [Member] | Las Palmas Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 1,530,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | Las Palmas Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 1,505,000
Acquired	2017-02
Stated Maturity	2018-06
Base Interest Rate	3.76%
Subsequent Event [Member] | The Village At Madera Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 2,780,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | The Village At Madera Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 1,465,000
Acquired	2017-02
Stated Maturity	2018-07
Base Interest Rate	3.76%
Subsequent Event [Member] | Harmony Court Bakers field Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 3,360,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | Harmony Court Bakers field Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 1,700,000
Acquired	2017-02
Stated Maturity	2018-07
Base Interest Rate	3.76%
Subsequent Event [Member] | Summerhill Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 5,785,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | Summerhill Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 2,870,000
Acquired	2017-02
Stated Maturity	2018-07
Base Interest Rate	3.76%
Subsequent Event [Member] | Courtyard Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 9,210,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | Courtyard Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 5,295,000
Acquired	2017-02
Stated Maturity	2018-07
Base Interest Rate	3.76%
Subsequent Event [Member] | Seasons Lakewood Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 6,615,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | Seasons Lakewood Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 4,475,000
Acquired	2017-02
Stated Maturity	2022-08
Base Interest Rate	3.76%
Subsequent Event [Member] | Seasons San Juan Capistrano Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 11,140,000
Acquired	2017-02
Stated Maturity	2022-02
Base Interest Rate	3.89%
Subsequent Event [Member] | Seasons San Juan Capistrano Series B [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 5,590,000
Acquired	2017-02
Stated Maturity	2022-08
Base Interest Rate	3.76%
Subsequent Event [Member] | Avistar at Wood Hollow [Member] | Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 27,075,000
Acquired	2017-02
Stated Maturity	2027-02
Base Interest Rate	4.46%
Subsequent Event [Member] | Avistar at the Crest [Member] | Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 3,210,000
Acquired	2017-02
Stated Maturity	2027-02
Base Interest Rate	4.46%
Subsequent Event [Member] | Avistar at Wilcrest [Member] | Series A [Member]
Short Term Debt [Line Items]
Outstanding Term A/B Trust Financing	$ 8,500,000
Acquired	2017-02
Stated Maturity	2027-02
Base Interest Rate	4.46%