Mortgage-Backed Securities Carrying Value of Asset (Details) - Trust Portfolio M B S Bonds	12 Months Ended
	Dec. 31, 2015 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Cost adjusted for pay-downs	$ 14,953,030
Unrealized Loss	(177,721)
Available-for-sale Securities, Fair Value Disclosure, Mortgage-backed Securities	$ 14,775,309
Standard & Poor's, AAA Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Debt Instrument, Credit Rating	“AAA”	[1]
Cost adjusted for pay-downs	$ 5,052,348	[1]
Unrealized Loss	(34,648)	[1]
Available-for-sale Securities, Fair Value Disclosure, Mortgage-backed Securities	$ 5,017,700	[1]
Standard & Poor's, AA Rating [Member]
Schedule Of Available For Sale Securities [Line Items]
Debt Instrument, Credit Rating	“AA”	[1]
Cost adjusted for pay-downs	$ 9,900,682	[1]
Unrealized Loss	(143,073)	[1]
Available-for-sale Securities, Fair Value Disclosure, Mortgage-backed Securities	$ 9,757,609	[1]

[1] MBS Securities are reported based on the lowest rating issued by a Rating Agency, if more than one rating is issued on the security, at the date presented.