Loans Receivable - Schedule of Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($)
$ in Thousands |
Mar. 31, 2026 |
Sep. 30, 2025 |
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 20,168,933
|
$ 20,288,338
|
| Delinquency percent, past due |
0.78%
|
0.60%
|
| Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 20,012,218
|
$ 20,165,753
|
| Delinquency percent, current |
99.22%
|
99.40%
|
| Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 156,715
|
$ 122,585
|
| Delinquency percent, past due |
0.78%
|
0.60%
|
| 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 30,487
|
$ 18,558
|
| Delinquency percent, past due |
0.15%
|
0.09%
|
| 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 11,281
|
$ 21,204
|
| Delinquency percent, past due |
0.05%
|
0.10%
|
| 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 114,947
|
$ 82,823
|
| Delinquency percent, past due |
0.58%
|
0.41%
|
| Commercial loans |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 12,241,938
|
$ 11,851,657
|
| Delinquency percent, past due |
0.92%
|
0.61%
|
| Commercial loans | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 12,128,854
|
$ 11,778,787
|
| Commercial loans | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
113,084
|
72,870
|
| Commercial loans | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
19,748
|
139
|
| Commercial loans | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
7,045
|
14,482
|
| Commercial loans | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
86,291
|
58,249
|
| Commercial loans | Multi-family |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 4,672,599
|
$ 4,631,321
|
| Delinquency percent, past due |
1.03%
|
0.45%
|
| Commercial loans | Multi-family | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 4,624,446
|
$ 4,610,677
|
| Commercial loans | Multi-family | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
48,153
|
20,644
|
| Commercial loans | Multi-family | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
14,195
|
0
|
| Commercial loans | Multi-family | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
2,973
|
12,482
|
| Commercial loans | Multi-family | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
30,985
|
8,162
|
| Commercial loans | Commercial real estate |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 3,652,683
|
$ 3,588,950
|
| Delinquency percent, past due |
0.07%
|
1.42%
|
| Commercial loans | Commercial real estate | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 3,649,991
|
$ 3,537,909
|
| Commercial loans | Commercial real estate | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
2,692
|
51,041
|
| Commercial loans | Commercial real estate | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
1,184
|
87
|
| Commercial loans | Commercial real estate | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
912
|
| Commercial loans | Commercial real estate | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
1,508
|
50,042
|
| Commercial loans | Commercial & industrial |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 2,791,133
|
$ 2,386,363
|
| Delinquency percent, past due |
2.23%
|
0.05%
|
| Commercial loans | Commercial & industrial | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 2,728,894
|
$ 2,385,178
|
| Commercial loans | Commercial & industrial | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
62,239
|
1,185
|
| Commercial loans | Commercial & industrial | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
4,369
|
52
|
| Commercial loans | Commercial & industrial | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
4,072
|
1,088
|
| Commercial loans | Commercial & industrial | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
53,798
|
45
|
| Commercial loans | Construction |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 956,957
|
$ 1,105,101
|
| Delinquency percent, past due |
0.00%
|
0.00%
|
| Commercial loans | Construction | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 956,957
|
$ 1,105,101
|
| Commercial loans | Construction | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Commercial loans | Construction | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Commercial loans | Construction | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Commercial loans | Construction | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Commercial loans | Land - acquisition & development |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 168,566
|
$ 139,922
|
| Delinquency percent, past due |
0.00%
|
0.00%
|
| Commercial loans | Land - acquisition & development | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 168,566
|
$ 139,922
|
| Commercial loans | Land - acquisition & development | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Commercial loans | Land - acquisition & development | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Commercial loans | Land - acquisition & development | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Commercial loans | Land - acquisition & development | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Consumer loans |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 7,926,995
|
$ 8,436,681
|
| Delinquency percent, past due |
0.55%
|
0.59%
|
| Consumer loans | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 7,883,364
|
$ 8,386,966
|
| Consumer loans | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
43,631
|
49,715
|
| Consumer loans | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
10,739
|
18,419
|
| Consumer loans | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
4,236
|
6,722
|
| Consumer loans | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
28,656
|
24,574
|
| Consumer loans | Construction |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 38,867
|
$ 78,243
|
| Delinquency percent, past due |
2.30%
|
0.97%
|
| Consumer loans | Construction | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 37,975
|
$ 77,483
|
| Consumer loans | Construction | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
892
|
760
|
| Consumer loans | Construction | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
132
|
0
|
| Consumer loans | Construction | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
0
|
| Consumer loans | Construction | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
760
|
760
|
| Consumer loans | Single-family residential |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 7,501,331
|
$ 7,936,931
|
| Delinquency percent, past due |
0.53%
|
0.58%
|
| Consumer loans | Single-family residential | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 7,461,402
|
$ 7,890,843
|
| Consumer loans | Single-family residential | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
39,929
|
46,088
|
| Consumer loans | Single-family residential | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
9,296
|
16,639
|
| Consumer loans | Single-family residential | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
3,810
|
6,176
|
| Consumer loans | Single-family residential | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
26,823
|
23,273
|
| Consumer loans | Land - consumer lot loans |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 76,763
|
$ 88,696
|
| Delinquency percent, past due |
0.42%
|
0.37%
|
| Consumer loans | Land - consumer lot loans | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 76,438
|
$ 88,364
|
| Consumer loans | Land - consumer lot loans | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
325
|
332
|
| Consumer loans | Land - consumer lot loans | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
249
|
| Consumer loans | Land - consumer lot loans | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
0
|
60
|
| Consumer loans | Land - consumer lot loans | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
325
|
23
|
| Consumer loans | HELOC |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 255,352
|
$ 271,286
|
| Delinquency percent, past due |
0.74%
|
0.80%
|
| Consumer loans | HELOC | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 253,457
|
$ 269,104
|
| Consumer loans | HELOC | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
1,895
|
2,182
|
| Consumer loans | HELOC | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
1,089
|
1,432
|
| Consumer loans | HELOC | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
256
|
384
|
| Consumer loans | HELOC | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
550
|
366
|
| Consumer loans | Consumer |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 54,682
|
$ 61,525
|
| Delinquency percent, past due |
1.08%
|
0.57%
|
| Consumer loans | Consumer | Current |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 54,092
|
$ 61,172
|
| Consumer loans | Consumer | Total Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
590
|
353
|
| Consumer loans | Consumer | 30 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
222
|
99
|
| Consumer loans | Consumer | 60 days past due |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
170
|
102
|
| Consumer loans | Consumer | 90 Days Delinquent |
|
|
| Accounts, Notes, Loans and Financing Receivable [Line Items] |
|
|
| Loans receivable |
$ 198
|
$ 152
|