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Basis Of Presentation And Summary Of Significant Accounting Policies (Schedule Of Impact Of Restatement On Consolidated Statement Of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net income $ (5,104) $ 19,727  
Total other comprehensive income (loss) (7,892) (14,107)  
Comprehensive income $ (12,996) $ 5,620  
As Reported [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net income     $ 38,270
Net unrealized income on asset available for sale, net of tax     25,199
Total other comprehensive income (loss)     3,234
Comprehensive income     41,504
Correction [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net income     25,199
Net unrealized income on asset available for sale, net of tax     (25,199)
Total other comprehensive income (loss)     (25,199)
As Restated [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net income     63,469
Total other comprehensive income (loss)     (21,965)
Comprehensive income     $ 41,504