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Derivative Instruments and Hedging Activities (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2009 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Interest Rate Caps Purchased |  |  | $ 7,100,000 |  |  |
Derivative Cap Fixed Interest Rate |  |  | 2.97% |  |  |
Deposits, Money Market Deposits | 0 |  | 70,000,000 | 0 |  |
Future Interest Expenses on Hedge Terminated | 1,300,000 |  |  |  |  |
Interest rate caps | 0 |  |  | 0 |  | 14,000
Reduction in Money Market Deposits | 68,000,000 |  |  | 0 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | 265,000 | 421,000 |  | 681,000 | 780,000 |
Interest Expense Hedged Deposits |  |  |  | 695,000 | 962,000 |
Interest Expense Related To The Hedged Money Market Deposit Accounts Declined |  |  |  | 267,000 |  |
Interest Expense Related To The Hedged Money Market Deposit Accounts Description |  |  |  | The interest expense associated with the hedged deposits will be $1.3 million less for 2013 than for 2012. |  |
Interest Bearing Liabilities, Percentage |  |  |  | 0.95% | 1.20% |
Accounts Payable, Interest-Bearing | $ 0 |  |  | $ 0 |  | $ 428,000

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