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Customer Accounts - Schedule of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Deposit Liabilities [Line Items]    
Checking accounts, .15% and under $ 2,721,721 $ 2,555,766
Passbook and statement accounts, .10% and under 820,980 700,794
Insured money market accounts, .01% to .15% 2,462,891 2,564,318
Time deposit accounts    
Less than 1.00% 3,268,272 3,126,119
1.00% to 1.99% 1,292,612 1,177,356
2.00% to 2.99% 34,376 501,409
3.00% to 3.99% 0 5,156
4.00% and higher 0 785
Total time deposits 4,595,260 4,810,825
Customer accounts 10,600,852 10,631,703
Within 1 year 2,894,900 2,862,313
1 to 2 years 798,309 1,068,792
2 to 3 years 293,058 321,118
Over 3 years 608,993 558,602
Customer accounts greater than $250,000 $ 2,250,622 $ 2,096,690
Minimum    
Deposit Liabilities [Line Items]    
Money market rate 0.01% 0.01%
Maximum    
Deposit Liabilities [Line Items]    
Checking rate 0.15% 0.15%
Passbook and statement rate 0.10% 0.10%
Money market rate 0.15% 0.15%