Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ Details

Subsequent Events (Details) (USD $)	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Trust Portfolio--MBS Bonds [Member]
Subsequent Event [Line Items]
Available for Sale Securities, not Including Premiums	$ 10,000,000	$ 33,665,000	$ 31,600,000
Debt Instrument, Basis Spread on Variable Rate	1.20%
Debt, Weighted Average Interest Rate	3.90%
Trust Portfolio--MBS Bonds [Member] \| SPEARS [Member]
Subsequent Event [Line Items]
Available for Sale Securities, not Including Premiums	7,800,000
Trust Portfolio--MBS Bonds [Member] \| LIFERS [Member]
Subsequent Event [Line Items]
Available for Sale Securities, not Including Premiums	2,200,000
Rennaisance [Member]
Subsequent Event [Line Items]
Number of Units in Real Estate Property	208
Iona Lakes [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.90%
Series C [Member] \| Rennaisance [Member]
Subsequent Event [Line Items]
Available-for-sale Securities	2,900,000
Series A [Member] \| Rennaisance [Member]
Subsequent Event [Line Items]
Available-for-sale Securities	8,600,000
Debt Instrument, Interest Rate, Stated Percentage	6.00%
Series B [Member] \| Rennaisance [Member]
Subsequent Event [Line Items]
Available-for-sale Securities	$ 1,300,000
Series B and Series C [Member] \| Rennaisance [Member]
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	12.00%