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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Net income $ 35,978 $ 34,071 $ 71,260 $ 67,489
Other comprehensive income (loss) net of tax:        
Net unrealized gain (loss) on available-for-sales securities 408 (30,060) (2,228) (32,579)
Related tax benefit (expense) (150) 11,047 819 11,973
Reclassification adjustment of net gain from sale of available-for-sale securities included in net income 0 0 0 0
Related tax benefit (expense) 0 0 0 0
Other comprehensive income (loss) 258 (19,013) (1,409) (20,606)
Comprehensive income $ 36,236 $ 15,058 $ 69,851 $ 46,883