v3.26.1
Loans Receivable And Allowance For Credit Losses (Classified Loans) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One $ 1,106,095 $ 1,033,723
Year Two 912,743 560,108
Year Three 422,343 1,067,458
Year Four 730,888 1,215,877
Year Five 1,139,490 1,385,026
Prior Years 3,740,605 2,748,460
Revolving Line of Credit 132,995 117,327
Revolving Line of Credit Converted to Term Loan 7,706 8,021
Total Amortized Cost 8,192,865 8,136,000
One- to Four-Family Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 195,594 233,573
Year Two 221,515 233,389
Year Three 203,879 601,344
Year Four 548,566 972,071
Year Five 909,767 1,266,835
Prior Years 3,531,358 2,607,234
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 5,610,679 5,914,446
One- to Four-Family Segment [Member] | Originated [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 3,640,236 3,776,443
One- to Four-Family Segment [Member] | Originated [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 195,594 233,573
Year Two 220,814 232,879
Year Three 202,676 296,339
Year Four 270,657 529,728
Year Five 496,362 739,138
Prior Years 2,232,022 1,722,587
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 3,618,125 3,754,244
One- to Four-Family Segment [Member] | Originated [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 479 0
Year Three 554 1,409
Year Four 780 1,099
Year Five 1,541 1,672
Prior Years 4,718 4,614
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 8,072 8,794
One- to Four-Family Segment [Member] | Originated [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 222 0
Year Three 154 363
Year Four 833 568
Year Five 44 469
Prior Years 12,786 12,005
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 14,039 13,405
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 1,864,904 2,023,397
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 510
Year Three 495 301,792
Year Four 273,263 439,538
Year Five 411,091 524,927
Prior Years 1,169,762 748,902
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 1,854,611 2,015,669
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 0 1,441
Year Four 2,322 523
Year Five 729 366
Prior Years 716 367
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 3,767 2,697
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 0 0
Year Four 711 615
Year Five 0 263
Prior Years 5,815 4,153
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 6,526 5,031
One- to Four-Family Segment [Member] | Bulk Purchased [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 105,539 114,606
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 0 0
Year Four 0 0
Year Five 0 0
Prior Years 103,484 110,862
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 103,484 110,862
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 0 0
Year Four 0 0
Year Five 0 0
Prior Years 0 1,564
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 0 1,564
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 0 0
Year Four 0 0
Year Five 0 0
Prior Years 2,055 2,180
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 2,055 2,180
Commercial Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 904,280 790,804
Year Two 684,638 319,284
Year Three 213,108 461,181
Year Four 178,703 239,182
Year Five 226,070 116,952
Prior Years 206,535 139,000
Revolving Line of Credit 50,873 41,536
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 2,464,207 2,107,939
Commercial Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 2,190,959 1,898,183
Commercial Segment [Member] | Commercial Real Estate [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 733,700 639,555
Year Two 643,789 292,900
Year Three 190,812 396,152
Year Four 153,645 208,604
Year Five 198,836 111,266
Prior Years 198,248 134,388
Revolving Line of Credit 11,505 9,775
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 2,130,535 1,792,640
Commercial Segment [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 7,587
Year Two 0 0
Year Three 182 36,266
Year Four 0 16,060
Year Five 15,035 0
Prior Years 0 80
Revolving Line of Credit 409 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 15,626 59,993
Commercial Segment [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 39,944 39,962
Year Two 0 142
Year Three 126 2,681
Year Four 2,391 0
Year Five 98 106
Prior Years 2,091 2,609
Revolving Line of Credit 148 50
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 44,798 45,550
Commercial Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 273,248 209,756
Commercial Segment [Member] | Commercial and Industrial [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 130,456 103,700
Year Two 40,613 25,950
Year Three 21,903 26,082
Year Four 22,647 14,387
Year Five 12,050 5,555
Prior Years 6,196 1,923
Revolving Line of Credit 38,623 31,287
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 272,488 208,884
Commercial Segment [Member] | Commercial and Industrial [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 112 0
Year Two 0 0
Year Three 0 0
Year Four 0 44
Year Five 0 0
Prior Years 0 0
Revolving Line of Credit 0 355
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 112 399
Commercial Segment [Member] | Commercial and Industrial [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 68 0
Year Two 236 292
Year Three 85 0
Year Four 20 87
Year Five 51 25
Prior Years 0 0
Revolving Line of Credit 188 69
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 648 473
Consumer Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 6,221 9,346
Year Two 6,590 7,435
Year Three 5,356 4,933
Year Four 3,619 4,624
Year Five 3,653 1,239
Prior Years 2,712 2,226
Revolving Line of Credit 82,122 75,791
Revolving Line of Credit Converted to Term Loan 7,706 8,021
Total Amortized Cost 117,979 113,615
Consumer Segment [Member] | Home Equity [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 110,843 105,179
Consumer Segment [Member] | Home Equity [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 4,067 5,609
Year Two 4,466 5,532
Year Three 4,217 3,513
Year Four 2,880 3,755
Year Five 3,060 1,064
Prior Years 2,615 2,166
Revolving Line of Credit 81,571 75,067
Revolving Line of Credit Converted to Term Loan 7,541 7,937
Total Amortized Cost 110,417 104,643
Consumer Segment [Member] | Home Equity [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 39 0
Year Three 0 33
Year Four 12 0
Year Five 0 0
Prior Years 0 0
Revolving Line of Credit 45 251
Revolving Line of Credit Converted to Term Loan 36 42
Total Amortized Cost 132 326
Consumer Segment [Member] | Home Equity [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 100
Year Two 97 0
Year Three 0 0
Year Four 0 0
Year Five 0 0
Prior Years 4 11
Revolving Line of Credit 64 57
Revolving Line of Credit Converted to Term Loan 129 42
Total Amortized Cost 294 210
Consumer Segment [Member] | Other [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 7,136 8,436
Consumer Segment [Member] | Other [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 2,119 3,629
Year Two 1,986 1,877
Year Three 1,129 1,354
Year Four 727 824
Year Five 568 175
Prior Years 93 49
Revolving Line of Credit 442 416
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 7,064 8,324
Consumer Segment [Member] | Other [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 10 0
Year Four 0 0
Year Five 0 0
Prior Years 0 0
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 10 0
Consumer Segment [Member] | Other [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 35 8
Year Two 2 26
Year Three 0 33
Year Four 0 45
Year Five 25 0
Prior Years 0 0
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost $ 62 $ 112