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Loans Receivable - Loans Based on Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans $ 13,051,199 $ 12,959,272
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 12,323,502 12,303,135
Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 131,963 247,543
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 595,734 408,594
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Commercial loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 580,311  
2020 2,130,569  
2019 977,504  
2018 884,673  
2017 700,951  
Prior to 2017 1,218,249  
Revolving Loans 837,493  
Revolving to Term Loans 12,097  
Total Loans 7,341,847 7,044,426
Commercial loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 567,560  
2020 2,060,809  
2019 875,654  
2018 813,078  
2017 601,629  
Prior to 2017 1,005,429  
Revolving Loans 709,245  
Revolving to Term Loans 12,097  
Total Loans 6,645,501 6,412,415
Commercial loans | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 11,546  
2019 19,249  
2018 38,623  
2017 11,103  
Prior to 2017 46,140  
Revolving Loans 5,111  
Revolving to Term Loans 0  
Total Loans 131,772 247,351
Commercial loans | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 12,751  
2020 58,214  
2019 82,601  
2018 32,972  
2017 88,219  
Prior to 2017 166,680  
Revolving Loans 123,137  
Revolving to Term Loans 0  
Total Loans 564,574 384,660
Commercial loans | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 0 0
Commercial loans | Multi-family    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 120,709  
2020 387,119  
2019 124,814  
2018 284,418  
2017 241,199  
Prior to 2017 443,346  
Revolving Loans 8,195  
Revolving to Term Loans 0  
Total Loans 1,609,800 1,538,240
Commercial loans | Multi-family | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 120,709  
2020 384,701  
2019 114,454  
2018 276,390  
2017 232,338  
Prior to 2017 392,183  
Revolving Loans 8,195  
Revolving to Term Loans 0  
Total Loans 1,528,970 1,506,692
Commercial loans | Multi-family | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 2,418  
2019 2,816  
2018 4,054  
2017 5,092  
Prior to 2017 4,464  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 18,844 13,721
Commercial loans | Multi-family | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 7,544  
2018 3,974  
2017 3,769  
Prior to 2017 46,699  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 61,986 17,827
Commercial loans | Multi-family | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Commercial loans | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 158,763  
2020 433,885  
2019 258,824  
2018 266,758  
2017 282,629  
Prior to 2017 539,778  
Revolving Loans 2,217  
Revolving to Term Loans 0  
Total Loans 1,942,854 1,884,688
Commercial loans | Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 158,763  
2020 424,621  
2019 219,629  
2018 243,656  
2017 233,589  
Prior to 2017 443,025  
Revolving Loans 2,217  
Revolving to Term Loans 0  
Total Loans 1,725,500 1,681,230
Commercial loans | Commercial real estate | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 197  
2019 9,496  
2018 414  
2017 1,725  
Prior to 2017 26,103  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 37,935 92,184
Commercial loans | Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 9,067  
2019 29,699  
2018 22,688  
2017 47,315  
Prior to 2017 70,650  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 179,419 111,274
Commercial loans | Commercial real estate | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Commercial loans | Commercial and Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 170,623  
2020 855,956  
2019 74,795  
2018 90,969  
2017 79,691  
Prior to 2017 215,023  
Revolving Loans 744,311  
Revolving to Term Loans 12,097  
Total Loans 2,243,465 2,115,513
Commercial loans | Commercial and Industrial [Member] | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 157,872  
2020 801,134  
2019 60,562  
2018 83,496  
2017 75,301  
Prior to 2017 165,692  
Revolving Loans 616,063  
Revolving to Term Loans 12,097  
Total Loans 1,972,217 1,898,709
Commercial loans | Commercial and Industrial [Member] | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 8,931  
2019 6,937  
2018 1,163  
2017 4,286  
Prior to 2017 0  
Revolving Loans 5,111  
Revolving to Term Loans 0  
Total Loans 26,428 64,695
Commercial loans | Commercial and Industrial [Member] | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 12,751  
2020 45,891  
2019 7,296  
2018 6,310  
2017 104  
Prior to 2017 49,331  
Revolving Loans 123,137  
Revolving to Term Loans 0  
Total Loans 244,820 152,109
Commercial loans | Commercial and Industrial [Member] | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 0 0
Commercial loans | Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 119,251  
2020 410,450  
2019 482,982  
2018 223,219  
2017 79,726  
Prior to 2017 16  
Revolving Loans 77,463  
Revolving to Term Loans 0  
Total Loans 1,393,107 1,352,414
Commercial loans | Construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 119,251  
2020 407,194  
2019 446,042  
2018 190,227  
2017 42,695  
Prior to 2017 16  
Revolving Loans 77,463  
Revolving to Term Loans 0  
Total Loans 1,282,888 1,187,786
Commercial loans | Construction | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 32,992  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 32,992 61,178
Commercial loans | Construction | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 3,256  
2019 36,940  
2018 0  
2017 37,031  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 77,227 103,450
Commercial loans | Construction | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Commercial loans | Land - acquisition & development    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 10,965  
2020 43,159  
2019 36,089  
2018 19,309  
2017 17,706  
Prior to 2017 20,086  
Revolving Loans 5,307  
Revolving to Term Loans 0  
Total Loans 152,621 153,571
Commercial loans | Land - acquisition & development | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 10,965  
2020 43,159  
2019 34,967  
2018 19,309  
2017 17,706  
Prior to 2017 4,513  
Revolving Loans 5,307  
Revolving to Term Loans 0  
Total Loans 135,926 137,998
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 1,122  
2018 0  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 1,122 0
Commercial loans | Land - acquisition & development | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 293,244  
2020 1,123,317  
2019 633,190  
2018 585,084  
2017 617,301  
Prior to 2017 2,301,555  
Revolving Loans 154,960  
Revolving to Term Loans 701  
Total Loans 5,709,352 5,914,846
Consumer loans | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 293,244  
2020 1,122,844  
2019 632,031  
2018 584,872  
2017 614,687  
Prior to 2017 2,273,061  
Revolving Loans 153,823  
Revolving to Term Loans 701  
Total Loans 5,675,263  
Consumer loans | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 437  
2018 60  
2017 1,570  
Prior to 2017 5,739  
Revolving Loans 749  
Revolving to Term Loans 0  
Total Loans 8,555  
Consumer loans | 60 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 473  
2019 6  
2018 0  
2017 371  
Prior to 2017 5,222  
Revolving Loans 111  
Revolving to Term Loans 0  
Total Loans 6,183  
Consumer loans | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 716  
2018 152  
2017 673  
Prior to 2017 17,533  
Revolving Loans 277  
Revolving to Term Loans 0  
Total Loans 19,351  
Consumer loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 5,678,001 5,890,720
Consumer loans | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 191 192
Consumer loans | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 31,160 23,934
Consumer loans | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | Construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 11,469  
2020 250,459  
2019 35,802  
2018 1,621  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 299,351 295,953
Consumer loans | Construction | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 11,469  
2020 250,459  
2019 35,802  
2018 1,621  
2017 0  
Prior to 2017 0  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 299,351  
Consumer loans | Construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 299,351 295,953
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 | Construction | Doubtful    
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 250,276  
2020 825,451  
2019 579,740  
2018 525,704  
2017 609,832  
Prior to 2017 2,257,432  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 5,048,435 5,293,962
Consumer loans | Single-family residential | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 250,276  
2020 824,978  
2019 578,704  
2018 525,644  
2017 607,513  
Prior to 2017 2,229,415  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 5,016,530  
Consumer loans | Single-family residential | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 356  
2018 60  
2017 1,523  
Prior to 2017 5,538  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 7,477  
Consumer loans | Single-family residential | 60 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 473  
2019 0  
2018 0  
2017 357  
Prior to 2017 5,042  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 5,872  
Consumer loans | Single-family residential | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 680  
2018 0  
2017 439  
Prior to 2017 17,437  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 18,556  
Consumer loans | Single-family residential | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 5,018,759 5,270,666
Consumer loans | Single-family residential | Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 191 192
Consumer loans | Single-family residential | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 29,485 23,104
Consumer loans | Single-family residential | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | Land - consumer lot loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 20,268  
2020 38,986  
2019 16,360  
2018 6,143  
2017 7,116  
Prior to 2017 20,972  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 109,845 101,394
Consumer loans | Land - consumer lot loans | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 20,268  
2020 38,986  
2019 16,288  
2018 5,991  
2017 6,994  
Prior to 2017 20,721  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 109,248  
Consumer loans | Land - consumer lot loans | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 72  
2018 0  
2017 0  
Prior to 2017 23  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 95  
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 0  
2017 0  
Prior to 2017 168  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 168  
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 152  
2017 122  
Prior to 2017 60  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 334  
Consumer loans | Land - consumer lot loans | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 109,234 101,151
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 611 243
Consumer loans | Land - consumer lot loans | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | HELOC    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 0  
2018 0  
2017 0  
Prior to 2017 6,952  
Revolving Loans 132,619  
Revolving to Term Loans 701  
Total Loans 140,272 140,222
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 6,750  
Revolving Loans 131,482  
Revolving to Term Loans 701  
Total Loans 138,933  
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 167  
Revolving Loans 749  
Revolving to Term Loans 0  
Total Loans 916  
Consumer loans | HELOC | 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 5  
Revolving Loans 111  
Revolving to Term Loans 0  
Total Loans 116  
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 277  
Revolving to Term Loans 0  
Total Loans 307  
Consumer loans | HELOC | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 139,215 139,646
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 1,057 576
Consumer loans | HELOC | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 0 0
Consumer loans | Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 11,231  
2020 8,421  
2019 1,288  
2018 51,616  
2017 353  
Prior to 2017 16,199  
Revolving Loans 22,341  
Revolving to Term Loans 0  
Total Loans 111,449 83,315
Consumer loans | Consumer | Current    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 11,231  
2020 8,421  
2019 1,237  
2018 51,616  
2017 180  
Prior to 2017 16,175  
Revolving Loans 22,341  
Revolving to Term Loans 0  
Total Loans 111,201  
Consumer loans | Consumer | 30 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 9  
2018 0  
2017 47  
Prior to 2017 11  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 67  
Consumer loans | Consumer | 60 days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 6  
2018 0  
2017 14  
Prior to 2017 7  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 27  
Consumer loans | Consumer | 90+ days past due    
Financing Receivable, Credit Quality Indicator [Line Items]    
YTD 2021 0  
2020 0  
2019 36  
2018 0  
2017 112  
Prior to 2017 6  
Revolving Loans 0  
Revolving to Term Loans 0  
Total Loans 154  
Consumer loans | Consumer | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans 111,442 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 7 11
Consumer loans | Consumer | Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total Loans $ 0 $ 0