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Loans Receivable - Loans Based on Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans $ 13,208,075 $ 12,959,272
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 12,493,123 12,303,135
Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 138,062 247,543
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 576,890 408,594
Commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 1,239,432  
2020 2,006,966  
2019 982,347  
2018 775,840  
2017 675,322  
Prior to 2017 1,146,463  
Revolving Loans 887,512  
Revolving to Term Loans 12,216  
Total Loans 7,726,098 7,044,426
Commercial loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 1,227,069  
2020 1,933,656  
2019 887,255  
2018 708,078  
2017 579,934  
Prior to 2017 948,971  
Revolving Loans 745,649  
Revolving to Term Loans 11,944  
Total Loans 7,042,556 6,412,415
Commercial loans | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 11,761  
2019 11,217  
2018 38,049  
2017 4,559  
Prior to 2017 40,651  
Revolving Loans 31,636  
Revolving to Term Loans 0  
Total Loans 137,873 247,351
Commercial loans | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 12,363  
2020 61,549  
2019 83,875  
2018 29,713  
2017 90,829  
Prior to 2017 156,841  
Revolving Loans 110,227  
Revolving to Term Loans 272  
Total Loans 545,669 384,660
Commercial loans | Multi-family    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 267,297  
2020 509,070  
2019 255,783  
2018 300,222  
2017 253,633  
Prior to 2017 392,894  
Revolving Loans 8,221  
Revolving to Term Loans 0  
Total Loans 1,987,120 1,538,240
Commercial loans | Multi-family | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 267,297  
2020 507,301  
2019 248,237  
2018 295,532  
2017 247,043  
Prior to 2017 344,441  
Revolving Loans 8,221  
Revolving to Term Loans 0  
Total Loans 1,918,072 1,506,692
Commercial loans | Multi-family | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 1,769  
2019 0  
2018 4,039  
2017 2,844  
Prior to 2017 1,934  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 10,586 13,721
Commercial loans | Multi-family | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 7,546  
2018 651  
2017 3,746  
Prior to 2017 46,519  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 58,462 17,827
Commercial loans | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 252,949  
2020 453,083  
2019 356,904  
2018 330,650  
2017 289,258  
Prior to 2017 526,018  
Revolving Loans 2,203  
Revolving to Term Loans 0  
Total Loans 2,211,065 1,884,688
Commercial loans | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 252,949  
2020 443,877  
2019 282,617  
2018 274,651  
2017 240,058  
Prior to 2017 440,678  
Revolving Loans 2,203  
Revolving to Term Loans 0  
Total Loans 1,937,033 1,681,230
Commercial loans | Commercial real estate | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 194  
2019 4,432  
2018 33,380  
2017 1,697  
Prior to 2017 23,144  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 62,847 92,184
Commercial loans | Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 9,012  
2019 69,855  
2018 22,619  
2017 47,503  
Prior to 2017 62,196  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 211,185 111,274
Commercial loans | Commercial & industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 560,127  
2020 689,151  
2019 68,390  
2018 59,649  
2017 78,156  
Prior to 2017 207,967  
Revolving Loans 776,929  
Revolving to Term Loans 12,216  
Total Loans 2,452,585 2,115,513
Commercial loans | Commercial & industrial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 547,764  
2020 631,137  
2019 57,479  
2018 52,576  
2017 78,044  
Prior to 2017 159,841  
Revolving Loans 635,066  
Revolving to Term Loans 11,944  
Total Loans 2,173,851 1,898,709
Commercial loans | Commercial & industrial | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 9,798  
2019 6,785  
2018 630  
2017 18  
Prior to 2017 0  
Revolving Loans 31,636  
Revolving to Term Loans 0  
Total Loans 48,867 64,695
Commercial loans | Commercial & industrial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 12,363  
2020 48,216  
2019 4,126  
2018 6,443  
2017 94  
Prior to 2017 48,126  
Revolving Loans 110,227  
Revolving to Term Loans 272  
Total Loans 229,867 152,109
Commercial loans | Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 136,932  
2020 316,157  
2019 272,625  
2018 67,312  
2017 37,146  
Prior to 2017 0  
Revolving Loans 94,845  
Revolving to Term Loans 0  
Total Loans 925,017 1,352,414
Commercial loans | Construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 136,932  
2020 311,836  
2019 270,277  
2018 67,312  
2017 0  
Prior to 2017 0  
Revolving Loans 94,845  
Revolving to Term Loans 0  
Total Loans 881,202 1,187,786
Commercial loans | Construction | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 61,178
Commercial loans | Construction | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 4,321  
2019 2,348  
2018 0  
2017 37,146  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 43,815 103,450
Commercial loans | Land - acquisition & development    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 22,127  
2020 39,505  
2019 28,645  
2018 18,007  
2017 17,129  
Prior to 2017 19,584  
Revolving Loans 5,314  
Revolving to Term Loans 0  
Total Loans 150,311 153,571
Commercial loans | Land - acquisition & development | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 22,127  
2020 39,505  
2019 28,645  
2018 18,007  
2017 14,789  
Prior to 2017 4,011  
Revolving Loans 5,314  
Revolving to Term Loans 0  
Total Loans 132,398 137,998
Commercial loans | Land - acquisition & development | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 15,573  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 15,573 15,573
Commercial loans | Land - acquisition & development | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 2,340  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 2,340 0
Consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 602,362  
2020 1,111,965  
2019 542,677  
2018 511,682  
2017 521,020  
Prior to 2017 2,030,396  
Revolving Loans 160,656  
Revolving to Term Loans 1,219  
Total Loans 5,481,977 5,914,846
Consumer loans | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 602,362  
2020 1,111,965  
2019 542,633  
2018 510,916  
2017 520,680  
Prior to 2017 2,004,547  
Revolving Loans 160,380  
Revolving to Term Loans 1,219  
Total Loans 5,454,702  
Consumer loans | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 5  
2018 115  
2017 75  
Prior to 2017 6,033  
Revolving Loans 25  
Revolving to Term Loans 0  
Total Loans 6,253  
Consumer loans | 60 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 2  
2018 185  
2017 0  
Prior to 2017 960  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 1,147  
Consumer loans | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 37  
2018 466  
2017 265  
Prior to 2017 18,856  
Revolving Loans 251  
Revolving to Term Loans 0  
Total Loans 19,875  
Consumer loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 5,450,567 5,890,720
Consumer loans | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 189 192
Consumer loans | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 31,221 23,934
Consumer loans | Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 50,146  
2020 242,667  
2019 14,955  
2018 1,063  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 308,831 295,953
Consumer loans | Construction | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 50,146  
2020 242,667  
2019 14,955  
2018 1,063  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 308,831  
Consumer loans | Construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 308,831 295,953
Consumer loans | Construction | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | Construction | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | Single-family residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 499,799  
2020 825,204  
2019 512,811  
2018 459,147  
2017 514,284  
Prior to 2017 1,991,330  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 4,802,575 5,293,962
Consumer loans | Single-family residential | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 499,799  
2020 825,204  
2019 512,811  
2018 458,566  
2017 514,115  
Prior to 2017 1,965,872  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 4,776,367  
Consumer loans | Single-family residential | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 115  
2017 0  
Prior to 2017 5,753  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 5,868  
Consumer loans | Single-family residential | 60 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 960  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 960  
Consumer loans | Single-family residential | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 466  
2017 169  
Prior to 2017 18,745  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 19,380  
Consumer loans | Single-family residential | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 4,773,261 5,270,666
Consumer loans | Single-family residential | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 189 192
Consumer loans | Single-family residential | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 29,125 23,104
Consumer loans | Land - consumer lot loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 41,526  
2020 35,849  
2019 13,856  
2018 5,489  
2017 6,565  
Prior to 2017 18,926  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 122,211 101,394
Consumer loans | Land - consumer lot loans | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 41,526  
2020 35,849  
2019 13,856  
2018 5,304  
2017 6,565  
Prior to 2017 18,758  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 121,858  
Consumer loans | Land - consumer lot loans | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 93  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 93  
Consumer loans | Land - consumer lot loans | 60 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 185  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 185  
Consumer loans | Land - consumer lot loans | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 75  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 75  
Consumer loans | Land - consumer lot loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 122,034 101,151
Consumer loans | Land - consumer lot loans | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | Land - consumer lot loans | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 177 243
Consumer loans | HELOC    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 6,040  
Revolving Loans 137,807  
Revolving to Term Loans 1,219  
Total Loans 145,066 140,222
Consumer loans | HELOC | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 5,917  
Revolving Loans 137,531  
Revolving to Term Loans 1,219  
Total Loans 144,667  
Consumer loans | HELOC | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 93  
Revolving Loans 25  
Revolving to Term Loans 0  
Total Loans 118  
Consumer loans | HELOC | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 30  
Revolving Loans 251  
Revolving to Term Loans 0  
Total Loans 281  
Consumer loans | HELOC | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 143,167 139,646
Consumer loans | HELOC | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | HELOC | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 1,899 576
Consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 10,891  
2020 8,245  
2019 1,055  
2018 45,983  
2017 171  
Prior to 2017 14,100  
Revolving Loans 22,849  
Revolving to Term Loans 0  
Total Loans 103,294 83,315
Consumer loans | Consumer | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 10,891  
2020 8,245  
2019 1,011  
2018 45,983  
2017 0  
Prior to 2017 14,000  
Revolving Loans 22,849  
Revolving to Term Loans 0  
Total Loans 102,979  
Consumer loans | Consumer | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 5  
2018 0  
2017 75  
Prior to 2017 94  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 174  
Consumer loans | Consumer | 60 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 2  
2018 0  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 2  
Consumer loans | Consumer | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 37  
2018 0  
2017 96  
Prior to 2017 6  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 139  
Consumer loans | Consumer | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 103,274 83,304
Consumer loans | Consumer | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | Consumer | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans $ 20 $ 11