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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - South Africa [Member] - July 2021 Civil Unrest In South Africa [Member]
R in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Oct. 31, 2021
ZAR (R)
Item
Sep. 30, 2021
USD ($)
Sep. 30, 2021
ZAR (R)
Number of ATMs suffered damage 173    
Number of branches suffered damage 19    
Cost estimates to repair branches and damaged ATMs and to replace completely destroyed ATMs | R R 40.0    
July 2021 Compared To June 2021 [Member]      
Percentage decrease in ATMs transaction volume 13.00%    
August 2021 Compared To July 2021 [Member]      
Percentage decrease in ATMs transaction volume 3.00%    
Waiver Of Customers Pay To Utilize Other Bank's ATMs For August And September 2021 [Member]      
Lost transaction fee revenue   $ 0.4 R 6.0