Variable Interest Entities (VIE) (Narrative) (Details) (USD $)
6 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Variable Interest Entity, Not Primary Beneficiary [Member]
Jun. 30, 2012
Variable Interest Entity, Not Primary Beneficiary [Member]
Junior Subordinated Debt [Member]
Jun. 30, 2012
Partnership Interest [Member]
Dec. 31, 2011
Issuance of Equity [Member]
Variable Interest Entity [Line Items]            
Long-term Debt $ 206,515,000 $ 207,044,000 $ 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
VIE purpose     36-unit      
Construction and Development Costs     10,600,000      
Partnership total assets 10,200,000 10,900,000        
Federal investment tax credits $ 8,600,000          
Federal investment tax credit duration 10-year