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Loans Receivable - Loans Based on Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Gross Charge-offs      
Total Loans $ 785 $ 293  
Commercial loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 103,098   $ 492,643
2024 583,757   1,062,522
2023 1,084,092   3,617,204
2022 3,578,126   2,540,773
2021 2,501,491   1,201,276
Prior to 2021 2,963,433   1,857,904
Revolving Loans 1,468,252   1,374,384
Revolving to Term Loans 2,682   58,714
Total Loans 12,284,931   12,205,420
Gross Charge-offs      
YTD 2025 0   175
2024 0   42
2023 163   10
2022 0   15
2021 0   0
Prior to 2021 308   359
Revolving Loans 0   2,331
Revolving to Term Loans 49   31
Total Loans 520 80 2,963
Commercial loans | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 86,671   490,419
2024 576,623   1,034,082
2023 1,047,532   3,551,477
2022 3,499,721   2,488,588
2021 2,448,022   1,144,343
Prior to 2021 2,776,766   1,688,884
Revolving Loans 1,333,864   1,267,493
Revolving to Term Loans 1,161   58,710
Total Loans 11,770,360   11,723,996
Commercial loans | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 2,062   0
2023 0   1,698
2022 19,786   28,092
2021 28,130   11,254
Prior to 2021 9,393   14,851
Revolving Loans 59,255   21,264
Revolving to Term Loans 0   0
Total Loans 118,626   77,159
Commercial loans | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 16,427   2,224
2024 5,072   28,440
2023 36,560   64,029
2022 57,995   24,093
2021 25,339   45,679
Prior to 2021 174,664   154,169
Revolving Loans 75,133   85,627
Revolving to Term Loans 1,521   4
Total Loans 392,711   404,265
Commercial loans | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0    
2024 0    
2023 0    
2022 624    
2021 0    
Prior to 2021 2,610    
Revolving Loans 0    
Revolving to Term Loans 0    
Total Loans 3,234    
Commercial loans | Multi-family      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 5,618   62,038
2024 78,096   198,790
2023 267,763   1,660,724
2022 1,621,027   1,211,510
2021 1,283,529   586,668
Prior to 2021 1,428,137   763,090
Revolving Loans 56,627   56,627
Revolving to Term Loans 0   16,753
Total Loans 4,740,797   4,556,200
Gross Charge-offs      
Total Loans 0 0  
Commercial loans | Multi-family | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 5,618   62,038
2024 78,096   198,790
2023 267,763   1,645,460
2022 1,594,835   1,203,005
2021 1,273,530   577,037
Prior to 2021 1,368,909   716,573
Revolving Loans 56,627   56,627
Revolving to Term Loans 0   16,753
Total Loans 4,645,378   4,476,283
Commercial loans | Multi-family | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   1,698
2022 1,692   2,655
2021 2,644   2,572
Prior to 2021 8,011   5,452
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 12,347   12,377
Commercial loans | Multi-family | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   13,566
2022 24,500   5,850
2021 7,355   7,059
Prior to 2021 48,607   41,065
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 80,462   67,540
Commercial loans | Multi-family | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0    
2024 0    
2023 0    
2022 0    
2021 0    
Prior to 2021 2,610    
Revolving Loans 0    
Revolving to Term Loans 0    
Total Loans 2,610    
Commercial loans | Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 44,950   216,520
2024 224,619   252,923
2023 230,989   1,094,886
2022 1,121,836   748,076
2021 725,602   509,314
Prior to 2021 1,226,721   875,187
Revolving Loans 35,046   35,249
Revolving to Term Loans 995   0
Total Loans 3,610,758   3,732,155
Gross Charge-offs      
YTD 2025 0   0
2024 0   0
2023 163   0
2022 0   0
2021 0   0
Prior to 2021 0   203
Revolving Loans 0   0
Revolving to Term Loans   0
Total Loans 163 0 203
Commercial loans | Commercial real estate | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 44,950   216,520
2024 224,619   252,923
2023 230,989   1,086,200
2022 1,117,060   723,600
2021 701,263   475,313
Prior to 2021 1,143,521   797,877
Revolving Loans 35,046   35,249
Revolving to Term Loans 995   0
Total Loans 3,498,443   3,587,682
Commercial loans | Commercial real estate | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   22,216
2021 22,086   8,682
Prior to 2021 1,382   9,399
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 23,468   40,297
Commercial loans | Commercial real estate | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   8,686
2022 4,776   2,260
2021 2,253   25,319
Prior to 2021 81,818   67,911
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 88,847   104,176
Commercial loans | Commercial & industrial      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 27,406   44,374
2024 79,247   167,877
2023 167,001   266,932
2022 247,764   284,432
2021 273,921   102,446
Prior to 2021 293,427   201,536
Revolving Loans 1,313,266   1,223,174
Revolving to Term Loans 1,687   41,961
Total Loans 2,403,719   2,332,732
Gross Charge-offs      
YTD 2025 0   175
2024 0   42
2023 0   10
2022 0   15
2021 0   0
Prior to 2021 308   7
Revolving Loans 0   2,331
Revolving to Term Loans 49   31
Total Loans 357 62 2,611
Commercial loans | Commercial & industrial | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 11,132   42,232
2024 77,063   148,059
2023 144,166   231,215
2022 224,384   282,148
2021 272,034   89,219
Prior to 2021 249,495   156,666
Revolving Loans 1,178,878   1,116,283
Revolving to Term Loans 166   41,957
Total Loans 2,157,318   2,107,779
Commercial loans | Commercial & industrial | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 2,062   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 0   0
Revolving Loans 59,255   21,264
Revolving to Term Loans 0   0
Total Loans 61,317   21,264
Commercial loans | Commercial & industrial | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 16,274   2,142
2024 122   19,818
2023 22,835   35,717
2022 23,380   2,284
2021 1,887   13,227
Prior to 2021 43,932   44,870
Revolving Loans 75,133   85,627
Revolving to Term Loans 1,521   4
Total Loans 185,084   203,689
Commercial loans | Construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 17,375   146,236
2024 177,034   429,956
2023 405,773   538,370
2022 537,343   250,120
2021 182,210   0
Prior to 2021 0   0
Revolving Loans 63,313   59,334
Revolving to Term Loans 0   0
Total Loans 1,383,048   1,424,016
Gross Charge-offs      
Total Loans 0 0  
Commercial loans | Construction | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 17,375   146,154
2024 172,782   421,334
2023 392,323   532,310
2022 513,286   233,200
2021 164,966   0
Prior to 2021 0   0
Revolving Loans 63,313   59,334
Revolving to Term Loans 0   0
Total Loans 1,324,045   1,392,332
Commercial loans | Construction | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 18,094   3,221
2021 3,400   0
Prior to 2021 0   0
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 21,494   3,221
Commercial loans | Construction | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   82
2024 4,252   8,622
2023 13,450   6,060
2022 5,339   13,699
2021 13,844   0
Prior to 2021 0   0
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 36,885   28,463
Commercial loans | Construction | Doubtful      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0    
2024 0    
2023 0    
2022 624    
2021 0    
Prior to 2021 0    
Revolving Loans 0    
Revolving to Term Loans 0    
Total Loans 624    
Commercial loans | Land - acquisition & development      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 7,749   23,475
2024 24,761   12,976
2023 12,566   56,292
2022 50,156   46,635
2021 36,229   2,848
Prior to 2021 15,148   18,091
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 146,609   160,317
Gross Charge-offs      
YTD 2025     0
2024     0
2023     0
2022     0
2021     0
Prior to 2021     149
Revolving Loans     0
Revolving to Term Loans     0
Total Loans 0 18 149
Commercial loans | Land - acquisition & development | Pass      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 7,596   23,475
2024 24,063   12,976
2023 12,291   56,292
2022 50,156   46,635
2021 36,229   2,774
Prior to 2021 14,841   17,768
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 145,176   159,920
Commercial loans | Land - acquisition & development | Special mention      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0    
2024 0    
2023 0    
2022 0    
2021 0    
Prior to 2021 0    
Revolving Loans 0    
Revolving to Term Loans 0    
Total Loans 0    
Commercial loans | Land - acquisition & development | Substandard      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 153   0
2024 698   0
2023 275   0
2022 0   0
2021 0   74
Prior to 2021 307   323
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 1,433   397
Consumer loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 228,521   460,352
2024 432,408   893,513
2023 876,850   2,334,575
2022 2,297,833   2,097,678
2021 2,061,318   817,561
Prior to 2021 2,768,696   2,009,369
Revolving Loans 313,718   300,523
Revolving to Term Loans 748   1,116
Total Loans 8,980,092   8,914,687
Gross Charge-offs      
YTD 2025 0   0
2024 0   0
2023 0   13
2022 0   0
2021 0   0
Prior to 2021 261   270
Revolving Loans 0   379
Revolving to Term Loans 4   0
Total Loans 265 213 662
Consumer loans | Current      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 228,521   460,352
2024 432,408   889,456
2023 875,810   2,329,898
2022 2,291,233   2,095,140
2021 2,058,387   814,809
Prior to 2021 2,747,975   1,992,035
Revolving Loans 311,503   298,047
Revolving to Term Loans 728   1,116
Total Loans 8,946,565   8,880,853
Consumer loans | 30 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 126   375
2022 1,276   0
2021 249   1,063
Prior to 2021 5,565   2,797
Revolving Loans 778   1,390
Revolving to Term Loans 20   0
Total Loans 8,014   5,625
Consumer loans | 60 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   3,237
2023 0   0
2022 1,883   1,199
2021 1,944   662
Prior to 2021 2,503   2,834
Revolving Loans 290   329
Revolving to Term Loans 0   0
Total Loans 6,620   8,261
Consumer loans | 90+ days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   820
2023 914   4,302
2022 3,441   1,339
2021 738   1,027
Prior to 2021 12,653   11,703
Revolving Loans 1,147   757
Revolving to Term Loans 0   0
Total Loans 18,893   19,948
Consumer loans | Construction      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 1,104   54,649
2024 72,529   108,941
2023 69,754   17,930
2022 11,968   537
2021 0   0
Prior to 2021 359   358
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 155,714   182,415
Gross Charge-offs      
Total Loans 0 0  
Consumer loans | Construction | Current      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 1,104   54,649
2024 72,529   108,941
2023 69,754   17,082
2022 11,120   537
2021 0   0
Prior to 2021 359   358
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 154,866   181,567
Consumer loans | Construction | 90+ days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   848
2022 848   0
2021 0   0
Prior to 2021 0   0
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 848   848
Consumer loans | Single-family residential      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 222,407   384,516
2024 340,215   769,730
2023 793,804   2,289,825
2022 2,261,368   2,063,897
2021 2,028,711   800,338
Prior to 2021 2,716,376   1,971,994
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 8,362,881   8,280,300
Gross Charge-offs      
YTD 2025     0
2024     0
2023     13
2022     0
2021     0
Prior to 2021     131
Revolving Loans     0
Revolving to Term Loans     0
Total Loans 0 0 144
Consumer loans | Single-family residential | Current      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 222,407   384,516
2024 340,215   765,673
2023 792,890   2,285,996
2022 2,255,616   2,061,359
2021 2,025,980   797,586
Prior to 2021 2,696,176   1,955,459
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 8,333,284   8,250,589
Consumer loans | Single-family residential | 30 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   375
2022 1,276   0
2021 49   1,063
Prior to 2021 5,314   2,489
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 6,639   3,927
Consumer loans | Single-family residential | 60 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   3,237
2023 0   0
2022 1,883   1,199
2021 1,944   662
Prior to 2021 2,280   2,442
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 6,107   7,540
Consumer loans | Single-family residential | 90+ days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   820
2023 914   3,454
2022 2,593   1,339
2021 738   1,027
Prior to 2021 12,606   11,604
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 16,851   18,244
Consumer loans | Land - consumer lot loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 4,931   19,672
2024 18,454   14,809
2023 13,269   26,839
2022 24,512   23,804
2021 23,288   9,223
Prior to 2021 22,035   13,713
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 106,489   108,060
Gross Charge-offs      
Total Loans 0 0  
Consumer loans | Land - consumer lot loans | Current      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 4,931   19,672
2024 18,454   14,809
2023 13,143   26,839
2022 24,512   23,804
2021 23,088   9,223
Prior to 2021 22,028   13,713
Revolving Loans 0   0
Revolving to Term Loans 0   0
Total Loans 106,156   108,060
Consumer loans | Land - consumer lot loans | 30 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0    
2024 0    
2023 126    
2022 0    
2021 200    
Prior to 2021 0    
Revolving Loans 0    
Revolving to Term Loans 0    
Total Loans 326    
Consumer loans | Land - consumer lot loans | 90+ days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0    
2024 0    
2023 0    
2022 0    
2021 0    
Prior to 2021 7    
Revolving Loans 0    
Revolving to Term Loans 0    
Total Loans 7    
Consumer loans | HELOC      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 4,841   4,792
Revolving Loans 273,450   263,949
Revolving to Term Loans 748   1,116
Total Loans 279,039   269,857
Gross Charge-offs      
Total Loans 0 0  
Consumer loans | HELOC | Current      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 4,448   4,176
Revolving Loans 271,826   262,055
Revolving to Term Loans 728   1,116
Total Loans 277,002   267,347
Consumer loans | HELOC | 30 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 233   216
Revolving Loans 663   1,171
Revolving to Term Loans 20   0
Total Loans 916   1,387
Consumer loans | HELOC | 60 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 152   392
Revolving Loans 231   185
Revolving to Term Loans 0   0
Total Loans 383   577
Consumer loans | HELOC | 90+ days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 8   8
Revolving Loans 730   538
Revolving to Term Loans 0   0
Total Loans 738   546
Consumer loans | Consumer      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 79   1,515
2024 1,210   33
2023 23    
2022     9,440
2021 9,319   8,000
Prior to 2021 25,085   18,512
Revolving Loans 40,268   36,574
Revolving to Term Loans 0   0
Total Loans 75,969   74,055
Gross Charge-offs      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 261   139
Revolving Loans 0   379
Revolving to Term Loans 4   0
Total Loans 265 $ 213 518
Consumer loans | Consumer | Netting adjustment      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023     (19)
2022 (15)    
Consumer loans | Consumer | Current      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 79   1,515
2024 1,210   33
2023 23    
2022     9,440
2021 9,319   8,000
Prior to 2021 24,964   18,329
Revolving Loans 39,677   35,992
Revolving to Term Loans 0   0
Total Loans 75,257   73,290
Consumer loans | Consumer | Current | Netting adjustment      
Financing Receivable, Credit Quality Indicator [Line Items]      
2023     (19)
2022 (15)    
Consumer loans | Consumer | 30 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 18   92
Revolving Loans 115   219
Revolving to Term Loans 0   0
Total Loans 133   311
Consumer loans | Consumer | 60 days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 71   0
Revolving Loans 59   144
Revolving to Term Loans 0   0
Total Loans 130   144
Consumer loans | Consumer | 90+ days past due      
Financing Receivable, Credit Quality Indicator [Line Items]      
YTD 2025 0   0
2024 0   0
2023 0   0
2022 0   0
2021 0   0
Prior to 2021 32   91
Revolving Loans 417   219
Revolving to Term Loans 0   0
Total Loans $ 449   $ 310