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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
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Mar. 31, 2012
Jun. 30, 2012
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Gain (loss) on investments          
Gain on investments $ 538 $ 466 $ 843 $ 169  
Realized gain (loss) on investments 353 361 449 215  
Unrealized gain (loss) 185 105 394 (46)  
Number of securities held from single issuer exceeding 10% of shareholders' equity     0   0
Threshold percentage of shareholders' equity for securities held from single issuer     10.00%   10.00%
Aggregate fair value of securities in unrealized loss position 1,885   1,885   3,466
Unrealized loss position     $ 47   $ 364
Number of securities in continuous unrealized loss position for more than 12 months     0   0