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CUSTOMER ACCOUNTS (Tables)
 12 Months Ended
Sep. 30, 2025
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, 2025
September 30, 2024
 
Deposit Account
Balance
As a % of
Total Deposits
Weighted
Average Rate
Deposit Account
Balance
As a % of
Total Deposits
Weighted
Average Rate
($ in thousands)
Non-interest checking
$2,567,539
12.0%
—%
$2,500,467
11.7%
—%
Interest checking
4,865,808
22.7
2.55
4,486,444
21.0
2.89
Savings
701,558
3.3
0.22
718,560
3.4
0.23
Money market
4,171,627
19.4
2.14
4,111,714
19.2
2.22
Time deposits
9,131,104
42.6
3.74
9,556,785
44.7
4.58
Total
$21,437,636
100%
2.60%
$21,373,970
100%
3.09%
Schedule of Time Deposits
Time deposits by rate band are as follows:
September 30, 2025
September 30, 2024
 
(In thousands)
Less than 1.00%
$45,200
$82,935
1.00% to 1.99%
24,526
2,395
2.00% to 2.99%
226,537
3,340
3.00% to 3.99%
7,310,525
345,680
4.00% to 4.99%
1,523,726
8,244,791
5.00% and higher
590
877,644
$9,131,104
$9,556,785
Time deposits by maturity band are as follows:
September 30, 2025
September 30, 2024
 
(In thousands)
Three months or less
$3,426,185
$2,923,299
Over 3 through 6 months
2,367,760
3,140,278
Over 6 through 12 months
2,933,212
2,543,201
Over 12 months
403,947
950,007
$9,131,104
$9,556,785
Schedule of Interest Expense on Customer Deposits Interest expense on customer accounts consisted of the following: 
Year ended September 30,
2025
2024
2023
(In thousands)
Checking accounts
$95,411
$99,917
$70,396
Savings accounts
3,367
3,952
1,715
Money market accounts
87,962
77,993
47,485
Time deposit accounts
419,197
351,654
119,255
605,937
533,516
238,851
Less early withdrawal penalties
(1,230)
(1,082)
(1,618)
$604,707
$532,434
$237,233
Weighted average interest rate at end of year
2.60%
3.09%
2.12%
Daily weighted average interest rate during the year
3.22%
3.26%
1.84%