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Variable Interest Entities (VIE) (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2009
Variable Interest Entity, Not Primary Beneficiary [Member]
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Mar. 31, 2013
Variable Interest Entity, Not Primary Beneficiary [Member]
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Dec. 31, 2012
Variable Interest Entity, Not Primary Beneficiary [Member]
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Mar. 31, 2013
Variable Interest Entity, Not Primary Beneficiary [Member]
Junior Subordinated Debt [Member]
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Dec. 31, 2011
Issuance of Equity [Member]
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Dec. 31, 2009
Issuance of Equity [Member]
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| Variable Interest Entity [Line Items] | |||||||||
| Long-term Debt | $ 182,720,000 | $ 182,735,000 | $ 41,700,000 | $ 5,000,000 | |||||
| Equity Method Investments | 1,300,000 | ||||||||
| Ownership in Liberty Mews Limited Partnership | 99.99% | ||||||||
| VIE financing | 10,600,000 | 6,100,000 | 6,100,000 | ||||||
| VIE purpose | purchase the land and construct a 36-unit low income housing rental complex | ||||||||
| Construction and Development Costs | 10,600,000 | ||||||||
| Partnership total assets | 9,900,000 | 10,000,000 | |||||||
| Federal investment tax credits | $ 8,400,000 | ||||||||
| Federal investment tax credit duration | 10 years | ||||||||