Mortgage-Backed Securities Carrying Value of Asset (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 79,236,600		$ 48,827,485
Unrealized Gain	1,411,560		1,165,695
Available-for-sale Securities, Gross Unrealized Losses	4,180,745		4,289,886
Available-for-sale Securities, Fair Value Disclosure, Mortgage-backed Securities	34,115,328		32,121,412
Trust Portfolio--MBS Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	34,631,899		32,535,077
Unrealized Gain			0
Available-for-sale Securities, Gross Unrealized Losses	(516,571)		(413,665)
Available-for-sale Securities, Fair Value Disclosure, Mortgage-backed Securities	34,115,328		32,121,412
Trust Portfolio--MBS Bonds [Member] | Standard & Poor's, AA Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Credit Rating	"AA"	[1]	"AA"	[1]
Available-for-sale Securities, Amortized Cost Basis	21,509,965		19,407,675
Unrealized Gain			0
Available-for-sale Securities, Gross Unrealized Losses	(342,530)		(284,052)
Available-for-sale Securities, Fair Value Disclosure, Mortgage-backed Securities	21,167,435		19,123,623
Trust Portfolio--MBS Bonds [Member] | Standard & Poor's, AAA Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt Instrument, Credit Rating	"AAA"	[1]	"AAA"	[1]
Available-for-sale Securities, Amortized Cost Basis	13,121,934		13,127,402
Unrealized Gain			0
Available-for-sale Securities, Gross Unrealized Losses	(174,041)		(129,613)
Available-for-sale Securities, Fair Value Disclosure, Mortgage-backed Securities	$ 12,947,893		$ 12,997,789

[1] (1) MBS 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.