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Customer Accounts (Tables)
12 Months Ended
Sep. 30, 2022
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, 2022September 30, 2021
 Deposit Account BalanceAs a % of Total DepositsWeighted
Average Rate
Deposit Account BalanceAs a % of Total DepositsWeighted
Average Rate
($ in thousands)
Non-interest checking$3,266,734 20.4 %— %$3,122,397 20.1 %— %
Interest checking3,497,795 21.8 0.90 3,566,322 22.9 0.20 
Savings1,059,093 6.6 0.13 1,039,336 6.7 0.11 
Money market4,867,905 30.4 0.49 4,379,970 28.2 0.19 
Time deposits3,338,043 20.8 0.74 3,434,087 22.1 0.54 
Total$16,029,570 100 %0.51 %$15,542,112 100 %0.23 %
Schedule of time deposits
Time deposits by rate band are as follows:September 30, 2022September 30, 2021
 (In thousands)
Less than 1.00%$2,705,212 $3,153,788 
1.00% to 1.99%304,702 229,594 
2.00% to 2.99%327,852 50,608 
3.00% to 3.99%277 97 
$3,338,043 $3,434,087 
Time deposits by maturity band are as follows:September 30, 2022September 30, 2021
 (In thousands)
Three months or less$1,007,735 $1,085,001 
Over 3 through 6 months966,800 819,906 
Over 6 through 12 months810,680 870,801 
Over 12 months552,828 658,379 
$3,338,043 $3,434,087 
Schedule of interest expense on customer deposits
Interest expense on customer accounts consisted of the following: 
Year ended September 30,202220212020
(In thousands)
Checking accounts$10,086 $5,545 $8,447 
Savings accounts1,377 1,143 959 
Money market accounts12,423 8,723 18,951 
Time deposit accounts19,422 27,100 72,494 
43,308 42,511 100,851 
Less early withdrawal penalties(267)(198)(539)
$43,041 $42,313 $100,312 
Weighted average interest rate at end of year0.51 %0.23 %0.48 %
Daily weighted average interest rate during the year0.34 %0.35 %0.94 %