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Borrowings Under Line of Credit Arrangements and Related Items (Tables)
3 Months Ended
Jun. 30, 2012
Borrowings Under Line of Credit Arrangement and Related Items (Tables) [Abstract]  
Aggregate borrowings under the unsecured line of credit arrangements
   Three Months Ended June 30, Six Months Ended June 30,
   2012 2011 2012 2011
Balance outstanding at quarter end $ 393,000 $ 0 $ 393,000 $ 0
Maximum amount outstanding at any month end $ 393,000 $ 20,000 $ 897,000 $ 495,000
Average amount outstanding (total of daily            
 principal balances divided by days in period) $ 122,209 $ 253 $ 301,456 $ 158,856
Weighted average interest rate (actual interest            
 expense divided by average borrowings outstanding)  1.65%  n/a  1.65%  2.17%