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Customer Accounts - Schedule of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Deposit Account Balance      
Non-interest checking $ 1,401,226 $ 1,258,274  
Interest checking 1,778,520 1,760,821  
Savings 836,501 888,881  
Money market 2,566,096 2,453,182  
Time deposits 4,804,803 4,473,850  
Customer accounts $ 11,387,146 $ 10,835,008  
As a % of Total Deposits      
Non-interest checking 12.40% 11.60%  
Interest checking 15.60% 16.30%  
Savings 7.30% 8.20%  
Money market 22.50% 22.60%  
Time deposits 42.20% 41.30%  
Total 100.00% 100.00%  
Weighted Average Rate      
Interest checking 0.50% 0.23%  
Savings 0.11% 0.11%  
Money market 0.65% 0.19%  
Time deposits 1.50% 1.09%  
Total 0.87% 0.54% 0.50%