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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parentheticals) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 | Mar. 31, 2011
Net unrealized loss on available-for-sale securities, tax | $ 11,047 | $ 9,055 | $ 11,973 | $ 18,652

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