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Loans Receivable - Loans Based on Credit Quality Indicators (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022
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Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 |  | $ 0
2022 |  | 1,594
2021 |  | 0
2020 |  | 0
2019 |  | 0
Prior to 2019 |  | 0
Revolving Loans |  | 0
Revolving to Term Loans |  | 0
Total Loans |  | 1,594
Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | $ 372,249 | 2,351,822
2022 | 2,509,270 | 2,646,527
2021 | 2,593,210 | 1,316,898
2020 | 1,297,514 | 574,962
2019 | 571,392 | 422,204
Prior to 2019 | 1,456,736 | 1,120,742
Revolving Loans | 1,556,712 | 1,295,091
Revolving to Term Loans | 1,911 | 255
Total Loans | 10,358,994 | 9,728,501
Commercial loans | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 372,249 | 2,343,088
2022 | 2,485,829 | 2,630,037
2021 | 2,573,937 | 1,299,292
2020 | 1,261,433 | 539,354
2019 | 534,822 | 409,574
Prior to 2019 | 1,407,932 | 1,082,730
Revolving Loans | 1,467,037 | 1,204,597
Revolving to Term Loans | 1,911 | 255
Total Loans | 10,105,150 | 9,508,927
Commercial loans | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 2,503
2022 | 0 | 1,594
2021 | 2,601 | 0
2020 | 0 | 0
2019 | 1,382 | 0
Prior to 2019 | 0 | 0
Revolving Loans | 2,850 | 29,153
Revolving to Term Loans | 0 | 0
Total Loans | 6,833 | 33,250
Commercial loans | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 6,231
2022 | 23,441 | 14,896
2021 | 16,672 | 17,606
2020 | 36,081 | 35,608
2019 | 35,188 | 12,630
Prior to 2019 | 48,804 | 38,012
Revolving Loans | 86,825 | 61,341
Revolving to Term Loans | 0 | 0
Total Loans | 247,011 | 186,324
Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 94,649 | 661,095
2022 | 670,726 | 778,936
2021 | 763,102 | 502,646
2020 | 490,648 | 168,568
2019 | 167,495 | 163,704
Prior to 2019 | 472,778 | 317,428
Revolving Loans | 36,361 | 34,102
Revolving to Term Loans | 0 | 0
Total Loans | 2,695,759 | 2,626,479
Commercial loans | Multi-family | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 94,649 | 657,144
2022 | 666,795 | 778,936
2021 | 763,102 | 500,917
2020 | 486,468 | 168,568
2019 | 167,495 | 157,144
Prior to 2019 | 464,692 | 315,858
Revolving Loans | 36,361 | 34,102
Revolving to Term Loans | 0 | 0
Total Loans | 2,679,562 | 2,612,669
Commercial loans | Multi-family | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 3,951
2022 | 3,931 | 0
2021 | 0 | 1,729
2020 | 4,180 | 0
2019 | 0 | 6,560
Prior to 2019 | 8,086 | 1,570
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 16,197 | 13,810
Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 130,440 | 820,749
2022 | 812,040 | 680,915
2021 | 723,882 | 498,900
2020 | 494,025 | 331,612
2019 | 328,075 | 223,028
Prior to 2019 | 720,901 | 551,931
Revolving Loans | 3,945 | 3,977
Revolving to Term Loans | 0 | 0
Total Loans | 3,213,308 | 3,111,112
Commercial loans | Commercial real estate | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 130,440 | 820,490
2022 | 806,478 | 679,321
2021 | 722,298 | 492,826
2020 | 467,416 | 301,033
2019 | 296,176 | 218,171
Prior to 2019 | 705,610 | 541,008
Revolving Loans | 1,375 | 1,391
Revolving to Term Loans | 0 | 0
Total Loans | 3,129,793 | 3,054,240
Commercial loans | Commercial real estate | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 1,382 |
Prior to 2019 | 0 |
Revolving Loans | 0 |
Revolving to Term Loans | 0 |
Total Loans | 1,382 |
Commercial loans | Commercial real estate | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 259
2022 | 5,562 | 0
2021 | 1,584 | 6,074
2020 | 26,609 | 30,579
2019 | 30,517 | 4,857
Prior to 2019 | 15,291 | 10,923
Revolving Loans | 2,570 | 2,586
Revolving to Term Loans | 0 | 0
Total Loans | 82,133 | 55,278
Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 124,523 | 259,192
2022 | 280,121 | 448,269
2021 | 360,596 | 155,602
2020 | 140,225 | 44,131
2019 | 39,256 | 26,922
Prior to 2019 | 236,750 | 223,428
Revolving Loans | 1,437,884 | 1,185,604
Revolving to Term Loans | 1,911 | 255
Total Loans | 2,621,266 | 2,343,403
Commercial loans | Commercial & industrial | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 124,523 | 254,668
2022 | 272,160 | 435,630
2021 | 345,166 | 145,799
2020 | 134,933 | 39,102
2019 | 34,585 | 25,709
Prior to 2019 | 211,323 | 197,909
Revolving Loans | 1,350,779 | 1,097,696
Revolving to Term Loans | 1,911 | 255
Total Loans | 2,475,380 | 2,196,768
Commercial loans | Commercial & industrial | Special mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 2,503
2022 | 0 | 0
2021 | 2,601 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 0 | 0
Revolving Loans | 2,850 | 29,153
Revolving to Term Loans | 0 | 0
Total Loans | 5,451 | 31,656
Commercial loans | Commercial & industrial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 2,021
2022 | 7,961 | 12,639
2021 | 12,829 | 9,803
2020 | 5,292 | 5,029
2019 | 4,671 | 1,213
Prior to 2019 | 25,427 | 25,519
Revolving Loans | 84,255 | 58,755
Revolving to Term Loans | 0 | 0
Total Loans | 140,435 | 114,979
Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 17,955 | 510,764
2022 | 657,795 | 673,868
2021 | 696,773 | 142,816
2020 | 155,086 | 27,260
2019 | 33,585 | 375
Prior to 2019 | 375 | 0
Revolving Loans | 75,930 | 68,808
Revolving to Term Loans | 0 | 0
Total Loans | 1,637,499 | 1,423,891
Commercial loans | Construction | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 17,955 | 510,764
2022 | 651,808 | 671,611
2021 | 694,514 | 142,816
2020 | 155,086 | 27,260
2019 | 33,585 | 375
Prior to 2019 | 375 | 0
Revolving Loans | 75,930 | 68,808
Revolving to Term Loans | 0 | 0
Total Loans | 1,629,253 | 1,421,634
Commercial loans | Construction | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 5,987 | 2,257
2021 | 2,259 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 0 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 8,246 | 2,257
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 4,682 | 100,022
2022 | 88,588 | 64,539
2021 | 48,857 | 16,934
2020 | 17,530 | 3,391
2019 | 2,981 | 8,175
Prior to 2019 | 25,932 | 27,955
Revolving Loans | 2,592 | 2,600
Revolving to Term Loans | 0 | 0
Total Loans | 191,162 | 223,616
Commercial loans | Land - acquisition & development | Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 4,682 | 100,022
2022 | 88,588 | 64,539
2021 | 48,857 | 16,934
2020 | 17,530 | 3,391
2019 | 2,981 | 8,175
Prior to 2019 | 25,932 | 27,955
Revolving Loans | 2,592 | 2,600
Revolving to Term Loans | 0 | 0
Total Loans | 191,162 | 223,616
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 224,142 | 1,420,965
2022 | 1,520,989 | 1,873,721
2021 | 1,867,755 | 806,033
2020 | 796,591 | 328,430
2019 | 320,649 | 303,923
Prior to 2019 | 1,847,441 | 1,598,038
Revolving Loans | 233,299 | 225,772
Revolving to Term Loans | 525 | 989
Total Loans | 6,811,391 | 6,557,871
Consumer loans | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 224,142 | 1,420,964
2022 | 1,520,987 | 1,873,286
2021 | 1,865,683 | 805,494
2020 | 796,591 | 327,315
2019 | 319,469 | 303,923
Prior to 2019 | 1,828,221 | 1,581,180
Revolving Loans | 231,293 | 225,461
Revolving to Term Loans | 525 | 989
Total Loans | 6,786,911 | 6,538,612
Consumer loans | 30 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 1,637 | 400
2020 | 0 | 606
2019 | 63 | 0
Prior to 2019 | 4,307 | 2,040
Revolving Loans | 1,878 | 67
Revolving to Term Loans | 0 | 0
Total Loans | 7,885 | 3,113
Consumer loans | 60 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 139
2020 | 0 | 0
2019 | 1 | 0
Prior to 2019 | 2,211 | 1,362
Revolving Loans | 0 | 17
Revolving to Term Loans | 0 | 0
Total Loans | 2,212 | 1,518
Consumer loans | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 1
2022 | 2 | 435
2021 | 435 | 0
2020 | 0 | 509
2019 | 1,116 | 0
Prior to 2019 | 12,702 | 13,456
Revolving Loans | 128 | 227
Revolving to Term Loans | 0 | 0
Total Loans | 14,383 | 14,628
Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 235,030
2022 | 320,079 | 150,869
2021 | 82,784 | 9,811
2020 | 4,864 | 1,155
2019 | 358 | 478
Prior to 2019 | 478 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 408,563 | 397,343
Consumer loans | Construction | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 235,030
2022 | 320,079 | 150,434
2021 | 82,349 | 9,811
2020 | 4,864 | 1,155
2019 | 358 | 478
Prior to 2019 | 478 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 408,128 | 396,908
Consumer loans | Construction | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 435
2021 | 435 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 0 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 435 | 435
Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 219,679 | 1,131,152
2022 | 1,148,027 | 1,652,242
2021 | 1,719,327 | 772,169
2020 | 768,368 | 321,627
2019 | 314,866 | 276,093
Prior to 2019 | 1,797,411 | 1,573,696
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 5,967,678 | 5,726,979
Consumer loans | Single-family residential | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 219,679 | 1,131,152
2022 | 1,148,027 | 1,652,242
2021 | 1,717,690 | 771,769
2020 | 768,368 | 320,546
2019 | 313,719 | 276,093
Prior to 2019 | 1,778,899 | 1,557,194
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 5,946,382 | 5,708,996
Consumer loans | Single-family residential | 30 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 1,637 | 400
2020 | 0 | 604
2019 | 63 | 0
Prior to 2019 | 3,961 | 1,792
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 5,661 | 2,796
Consumer loans | Single-family residential | 60 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 2,038 | 1,316
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 2,038 | 1,316
Consumer loans | Single-family residential | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 477
2019 | 1,084 | 0
Prior to 2019 | 12,513 | 13,394
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 13,597 | 13,871
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 4,355 | 53,396
2022 | 50,736 | 60,454
2021 | 55,658 | 16,015
2020 | 15,336 | 5,399
2019 | 5,189 | 3,433
Prior to 2019 | 15,804 | 13,248
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 147,078 | 151,945
Consumer loans | Land - consumer lot loans | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 4,355 | 53,396
2022 | 50,736 | 60,454
2021 | 55,658 | 15,876
2020 | 15,336 | 5,399
2019 | 5,189 | 3,433
Prior to 2019 | 15,695 | 13,188
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 146,969 | 151,746
Consumer loans | Land - consumer lot loans | 30 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 139
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 49 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 49 | 139
Consumer loans | Land - consumer lot loans | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 60 | 60
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 60 | 60
Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 5,106 | 4,473
Revolving Loans | 209,273 | 200,571
Revolving to Term Loans | 525 | 989
Total Loans | 214,904 | 206,033
Consumer loans | HELOC | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 4,846 | 4,349
Revolving Loans | 207,284 | 200,267
Revolving to Term Loans | 525 | 989
Total Loans | 212,655 | 205,605
Consumer loans | HELOC | 30 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 260 | 95
Revolving Loans | 1,861 | 60
Revolving to Term Loans | 0 | 0
Total Loans | 2,121 | 155
Consumer loans | HELOC | 60 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 |  | 0
2022 |  | 0
2021 |  | 0
2020 |  | 0
2019 |  | 0
Prior to 2019 |  | 29
Revolving Loans |  | 17
Revolving to Term Loans |  | 0
Total Loans |  | 46
Consumer loans | HELOC | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 0 | 0
Prior to 2019 | 0 | 0
Revolving Loans | 128 | 227
Revolving to Term Loans | 0 | 0
Total Loans | 128 | 227
Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 108 | 1,387
2022 | 2,147 | 10,156
2021 | 9,986 | 8,038
2020 | 8,023 | 249
2019 | 236 | 23,919
Prior to 2019 | 28,642 | 6,621
Revolving Loans | 24,026 | 25,201
Revolving to Term Loans | 0 | 0
Total Loans | 73,168 | 75,571
Consumer loans | Consumer | Current |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 108 | 1,386
2022 | 2,145 | 10,156
2021 | 9,986 | 8,038
2020 | 8,023 | 215
2019 | 203 | 23,919
Prior to 2019 | 28,303 | 6,449
Revolving Loans | 24,009 | 25,194
Revolving to Term Loans | 0 | 0
Total Loans | 72,777 | 75,357
Consumer loans | Consumer | 30 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 2
2019 | 0 | 0
Prior to 2019 | 37 | 153
Revolving Loans | 17 | 7
Revolving to Term Loans | 0 | 0
Total Loans | 54 | 162
Consumer loans | Consumer | 60 days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 0
2022 | 0 | 0
2021 | 0 | 0
2020 | 0 | 0
2019 | 1 | 0
Prior to 2019 | 173 | 17
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | 174 | 17
Consumer loans | Consumer | 90+ days past due |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
YTD 2023 | 0 | 1
2022 | 2 | 0
2021 | 0 | 0
2020 | 0 | 32
2019 | 32 | 0
Prior to 2019 | 129 | 2
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total Loans | $ 163 | $ 35

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- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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