Mortgage-Backed Securities - By Type (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Mortgage Backed Securities [Line Items]
Fair Value	$ 115,379,574	$ 56,001,584
[MortgageBackedSecuritiesPassThroughCertificatesMember]
Mortgage Backed Securities [Line Items]
Fair Value	109,605,000	46,640,000
[MortgageBackedSecuritiesStructuredCertificatesMember]
Mortgage Backed Securities [Line Items]
Fair Value	5,775,000	9,362,000
[HybridAdjustableRateMortgagesMember] | [MortgageBackedSecuritiesPassThroughCertificatesMember]
Mortgage Backed Securities [Line Items]
Fair Value	59,485,000	25,466,000
[AdjustableRateMortgagesMember] | [MortgageBackedSecuritiesPassThroughCertificatesMember]
Mortgage Backed Securities [Line Items]
Fair Value	6,531,000	0
[FixedRateMortgagesMember] | [MortgageBackedSecuritiesPassThroughCertificatesMember]
Mortgage Backed Securities [Line Items]
Fair Value	43,589,000	21,174,000
[InterestOnlySecuritiesMember] | [MortgageBackedSecuritiesStructuredCertificatesMember]
Mortgage Backed Securities [Line Items]
Fair Value	2,884,000	1,638,000
[InverseInterestOnlyMember] | [MortgageBackedSecuritiesStructuredCertificatesMember]
Mortgage Backed Securities [Line Items]
Fair Value	$ 2,891,000	$ 7,724,000