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Variable Interest Entities (VIE) (Narrative) (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2013
Variable Interest Entity [Line Items]        
Long-term Debt $ 182,623,000     $ 182,672,000
Payments to Acquire Businesses and Interest in Affiliates   6,100,000 6,100,000  
VIE purpose purchase the land and construct a 36-unit low income housing rental complex      
Federal investment tax credits   8,400,000    
Federal investment tax credit duration   10 years    
Variable Interest Entity, Not Primary Beneficiary [Member]
        
Variable Interest Entity [Line Items]        
Long-term Debt 41,700,000      
Equity Method Investments 1,300,000      
Ownership in Liberty Mews Limited Partnership     99.99%  
VIE financing     10,600,000  
Construction and Development Costs     10,600,000  
Partnership total assets 9,500,000     9,700,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Junior Subordinated Debt [Member]
        
Variable Interest Entity [Line Items]        
Long-term Debt $ 5,000,000