v3.25.1
Loans Receivable And Allowance For Credit Losses (Delinquent Loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One $ 386,833 $ 639,789
Year Two 599,582 1,096,101
Year Three 1,109,648 1,372,917
Year Four 1,272,455 1,529,818
Year Five 1,459,467 827,047
Prior Years 2,956,112 2,339,984
Revolving Line of Credit 107,804 118,360
Revolving Line of Credit Converted to Term Loan 7,974 6,357
Total Amortized Cost 7,899,875 7,930,373
Financial Asset, Not Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 7,875,826 7,904,743
Financial Asset, 30 to 89 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 14,459 16,049
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 9,590 9,581
One- to Four-Family Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 108,626 242,563
Year Two 239,370 652,822
Year Three 628,095 1,063,977
Year Four 1,023,569 1,383,986
Year Five 1,331,081 749,865
Prior Years 2,798,139 2,223,566
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 6,128,880 6,316,779
One- to Four-Family Segment [Member] | Originated [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 3,866,343 3,950,046
One- to Four-Family Segment [Member] | Originated [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 108,626 241,765
Year Two 238,270 326,211
Year Three 312,625 578,430
Year Four 556,427 811,455
Year Five 777,828 521,550
Prior Years 1,861,709 1,459,500
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 3,855,485 3,938,911
One- to Four-Family Segment [Member] | Originated [Member] | Financial Asset, 30 to 89 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 314 64
Year Three 294 1,074
Year Four 953 638
Year Five 418 1,666
Prior Years 6,073 5,422
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 8,052 8,864
One- to Four-Family Segment [Member] | Originated [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 170
Year Three 0 49
Year Four 84 0
Year Five 524 601
Prior Years 2,198 1,451
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 2,806 2,271
One- to Four-Family Segment [Member] | Correspondent Purchased [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 2,142,220 2,239,143
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 798
Year Two 786 326,377
Year Three 314,901 482,598
Year Four 465,701 571,182
Year Five 551,531 226,048
Prior Years 804,342 624,961
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 2,137,261 2,231,964
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Financial Asset, 30 to 89 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 0 164
Year Four 241 446
Year Five 515 0
Prior Years 2,209 2,479
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 2,965 3,089
One- to Four-Family Segment [Member] | Correspondent Purchased [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 275 1,662
Year Four 163 265
Year Five 265 0
Prior Years 1,291 2,163
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 1,994 4,090
One- to Four-Family Segment [Member] | Bulk Purchased [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 120,317 127,590
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Financial Asset, Not Past Due [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 119,513 125,982
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 119,513 125,982
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Financial Asset, 30 to 89 Days Past Due [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 181 69
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 181 69
One- to Four-Family Segment [Member] | Bulk Purchased [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [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 623 1,539
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 623 1,539
Commercial Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 272,487 385,703
Year Two 351,211 436,131
Year Three 475,613 302,624
Year Four 243,525 144,010
Year Five 126,782 76,263
Prior Years 155,395 114,172
Revolving Line of Credit 37,195 44,829
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 1,662,208 1,503,732
Commercial Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 1,526,318 1,374,054
Commercial Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 258,792 338,511
Year Two 312,139 403,193
Year Three 446,201 284,493
Year Four 227,779 135,932
Year Five 120,081 74,266
Prior Years 147,948 110,448
Revolving Line of Credit 7,591 23,055
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 1,520,531 1,369,898
Commercial Segment [Member] | Commercial Real Estate [Member] | Financial Asset, 30 to 89 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 229
Year Two 0 807
Year Three 0 0
Year Four 0 3
Year Five 0 0
Prior Years 2,471 1,094
Revolving Line of Credit 0 860
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 2,471 2,993
Commercial Segment [Member] | Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 142 19
Year Three 490 0
Year Four 0 0
Year Five 111 647
Prior Years 2,523 497
Revolving Line of Credit 50 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 3,316 1,163
Commercial Segment [Member] | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 135,890 129,678
Commercial Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 13,695 46,736
Year Two 38,704 32,112
Year Three 28,922 17,990
Year Four 15,746 8,052
Year Five 6,590 1,350
Prior Years 2,371 2,051
Revolving Line of Credit 29,137 20,914
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 135,165 129,205
Commercial Segment [Member] | Commercial and Industrial [Member] | Financial Asset, 30 to 89 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 227
Year Two 0 0
Year Three 0 141
Year Four 0 23
Year Five 0 0
Prior Years 0 0
Revolving Line of Credit 348 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 348 391
Commercial Segment [Member] | Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 226 0
Year Three 0 0
Year Four 0 0
Year Five 0 0
Prior Years 82 82
Revolving Line of Credit 69 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 377 82
Consumer Segment [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 5,720 11,523
Year Two 9,001 7,148
Year Three 5,940 6,316
Year Four 5,361 1,822
Year Five 1,604 919
Prior Years 2,578 2,246
Revolving Line of Credit 70,609 73,531
Revolving Line of Credit Converted to Term Loan 7,974 6,357
Total Amortized Cost 108,787 109,862
Consumer Segment [Member] | Home Equity [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 99,353 100,247
Consumer Segment [Member] | Home Equity [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 2,988 7,331
Year Two 6,142 4,378
Year Three 4,052 4,540
Year Four 4,129 1,437
Year Five 1,337 814
Prior Years 2,336 2,133
Revolving Line of Credit 69,745 72,721
Revolving Line of Credit Converted to Term Loan 7,862 6,084
Total Amortized Cost 98,591 99,438
Consumer Segment [Member] | Home Equity [Member] | Financial Asset, 30 to 89 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 0
Year Three 15 35
Year Four 14 0
Year Five 0 0
Prior Years 153 0
Revolving Line of Credit 155 349
Revolving Line of Credit Converted to Term Loan 24 87
Total Amortized Cost 361 471
Consumer Segment [Member] | Home Equity [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 0
Year Two 0 19
Year Three 0 0
Year Four 0 0
Year Five 0 0
Prior Years 3 18
Revolving Line of Credit 310 115
Revolving Line of Credit Converted to Term Loan 88 186
Total Amortized Cost 401 338
Consumer Segment [Member] | Other [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Amortized Cost 9,434 9,615
Consumer Segment [Member] | Other [Member] | Financial Asset, Not Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 2,721 4,109
Year Two 2,801 2,728
Year Three 1,858 1,641
Year Four 1,210 327
Year Five 209 101
Prior Years 84 95
Revolving Line of Credit 397 344
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 9,280 9,345
Consumer Segment [Member] | Other [Member] | Financial Asset, 30 to 89 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 11 3
Year Two 8 9
Year Three 1 100
Year Four 1 58
Year Five 58 0
Prior Years 0 0
Revolving Line of Credit 2 2
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost 81 172
Consumer Segment [Member] | Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Year One 0 80
Year Two 50 14
Year Three 14 0
Year Four 7 0
Year Five 0 4
Prior Years 2 0
Revolving Line of Credit 0 0
Revolving Line of Credit Converted to Term Loan 0 0
Total Amortized Cost $ 73 $ 98