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Derivative Instruments and Hedging Activities (Details Textual) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2009
Dec. 31, 2011
Interest Rate Caps Purchased         $ 7,100,000  
Derivative Cap Fixed Interest Rate         2.97%  
Deposits, Money Market Deposits         70,000,000  
Derivative Asset, Fair Value, Net 68,000   68,000     250,000
Interest Expense Hedged Deposits     962,000 559,000    
Unrealized Holding Losses on Cash Flow Hedging Activities 421,000 (714,000) 780,000 (337,000)    
Future Interest Expenses on Hedge Deposits     2,100,000      
Accounts Payable, Interest-Bearing $ 428,000   $ 428,000     $ 428,000 [1]
[1] See Note 9 for further discussion.