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Customer Accounts (Tables)
 12 Months Ended
Sep. 30, 2021
Banking and Thrift, Interest [Abstract]  
Schedule of deposit liabilities
The following tables provide the composition of the Company's customer accounts, including time deposits.

  
September 30, 2021September 30, 2020
 Deposit Account BalanceAs a % of Total DepositsWeighted
Average Rate		Deposit Account BalanceAs a % of Total DepositsWeighted
Average Rate
($ in thousands)
Non-interest checking$3,122,397 20.1 %— %$2,164,071 15.7 %— %
Interest checking3,566,322 22.9 0.20 3,029,576 22.0 0.23 
Savings1,039,336 6.7 0.11 872,087 6.3 0.11 
Money market4,379,970 28.2 0.19 3,740,698 27.1 0.30 
Time deposits3,434,087 22.1 0.54 3,973,192 28.8 1.17 
Total$15,542,112 100 %0.23 %$13,779,624 100 %0.48 %
Schedule of time deposits
Time deposits by rate band are as follows:September 30, 2021September 30, 2020
 (In thousands)
Less than 1.00%$3,153,788 $920,220 
1.00% to 1.99%229,594 2,967,345 
2.00% to 2.99%50,608 85,533 
3.00% to 3.99%97 94 
$3,434,087 $3,973,192 
Time deposits by maturity band are as follows:September 30, 2021September 30, 2020
 (In thousands)
Three months or less$1,085,001 $1,238,184 
Over 3 through 6 months819,906 1,282,051 
Over 6 through 12 months870,801 607,181 
Over 12 months658,379 845,776 
$3,434,087 $3,973,192 
Schedule of interest expense on customer deposits
Interest expense on customer accounts consisted of the following: 

Year ended September 30,202120202019
(In thousands)
Checking accounts$5,545 $8,447 $12,499 
Savings accounts1,143 959 980 
Money market accounts8,723 18,951 21,967 
Time deposit accounts27,100 72,494 87,665 
42,511 100,851 123,111 
Less early withdrawal penalties(198)(539)(895)
$42,313 $100,312 $122,216 
Weighted average interest rate at end of year0.23 %0.48 %1.08 %
Daily weighted average interest rate during the year0.35 %0.94 %1.05 %