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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Net income $ 34,071 $ 25,824 $ 67,489 $ 50,354
Other comprehensive income, net of tax of:        
Net unrealized loss on available-for-sale securities, net of quarter-to-date tax of $11,047 and $9,055, and year-to-date tax of $11,973 and $18,652, respectively (19,013) (20,738) (20,606) (37,255)
Reclassification adjustment of net gain from sale of available-for-sale securities included in net income 0 5,153 0 5,153
Other comprehensive income (19,013) (15,585) (20,606) (32,102)
Comprehensive income $ 15,058 $ 10,239 $ 46,883 $ 18,252