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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) $ 13,208,075 $ 12,959,272
Days delinquent, current 13,169,902 12,928,463
Days delinquent, past due $ 38,173 $ 30,809
% based on $, current 99.71% 99.76%
% based on $, past due 0.29% 0.24%
30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 7,465 $ 4,470
% based on $, past due 0.06% 0.03%
60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 1,733 $ 3,973
% based on $, past due 0.01% 0.03%
90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 28,975 $ 22,366
% based on $, past due 0.22% 0.17%
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) $ 7,726,098 $ 7,044,426
Days delinquent, current 7,715,200 7,041,423
Days delinquent, past due $ 10,898 $ 3,003
% based on $, past due 0.14% 0.04%
Commercial loans | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 1,212 $ 0
Commercial loans | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 586 778
Commercial loans | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 9,100 2,225
Commercial loans | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 1,987,120 1,538,240
Days delinquent, current 1,986,645 1,538,240
Days delinquent, past due $ 475 $ 0
% based on $, past due 0.02% 0.00%
Commercial loans | Multi-family | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 0 $ 0
Commercial loans | Multi-family | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 475 0
Commercial loans | Multi-family | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 0
Commercial loans | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 2,211,065 1,884,688
Days delinquent, current 2,206,097 1,884,210
Days delinquent, past due $ 4,968 $ 478
% based on $, past due 0.22% 0.03%
Commercial loans | Commercial real estate | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 37 $ 0
Commercial loans | Commercial real estate | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 111 195
Commercial loans | Commercial real estate | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 4,820 283
Commercial loans | Commercial & industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 2,452,585 2,115,513
Days delinquent, current 2,450,623 2,114,650
Days delinquent, past due $ 1,962 $ 863
% based on $, past due 0.08% 0.04%
Commercial loans | Commercial & industrial | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 1,175 $ 0
Commercial loans | Commercial & industrial | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 583
Commercial loans | Commercial & industrial | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 787 280
Commercial loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 925,017 1,352,414
Days delinquent, current 923,864 1,350,752
Days delinquent, past due $ 1,153 $ 1,662
% based on $, past due 0.12% 0.12%
Commercial loans | Construction | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 0 $ 0
Commercial loans | Construction | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 0
Commercial loans | Construction | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 1,153 1,662
Commercial loans | Land - acquisition & development    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 150,311 153,571
Days delinquent, current 147,971 153,571
Days delinquent, past due $ 2,340 $ 0
% based on $, past due 1.56% 0.00%
Commercial loans | Land - acquisition & development | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 0 $ 0
Commercial loans | Land - acquisition & development | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 0
Commercial loans | Land - acquisition & development | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 2,340 0
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 5,481,977 5,914,846
Days delinquent, current 5,454,702 5,887,040
Days delinquent, past due $ 27,275 $ 27,806
% based on $, past due 0.50% 0.47%
Consumer loans | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 6,253 $ 4,470
Consumer loans | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 1,147 3,195
Consumer loans | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 19,875 20,141
Consumer loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 308,831 295,953
Days delinquent, current 308,831 295,953
Days delinquent, past due $ 0 $ 0
% based on $, past due 0.00% 0.00%
Consumer loans | Construction | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 0 $ 0
Consumer loans | Construction | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 0
Consumer loans | Construction | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 0
Consumer loans | Single-family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 4,802,575 5,293,962
Days delinquent, current 4,776,367 5,267,608
Days delinquent, past due $ 26,208 $ 26,354
% based on $, past due 0.55% 0.50%
Consumer loans | Single-family residential | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 5,868 $ 3,922
Consumer loans | Single-family residential | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 960 3,108
Consumer loans | Single-family residential | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 19,380 19,324
Consumer loans | Land - consumer lot loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 122,211 101,394
Days delinquent, current 121,858 101,029
Days delinquent, past due $ 353 $ 365
% based on $, past due 0.29% 0.36%
Consumer loans | Land - consumer lot loans | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 93 $ 152
Consumer loans | Land - consumer lot loans | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 185 0
Consumer loans | Land - consumer lot loans | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 75 213
Consumer loans | HELOC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 145,066 140,222
Days delinquent, current 144,667 139,491
Days delinquent, past due $ 399 $ 731
% based on $, past due 0.28% 0.52%
Consumer loans | HELOC | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 118 $ 275
Consumer loans | HELOC | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 76
Consumer loans | HELOC | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 281 380
Consumer loans | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 103,294 83,315
Days delinquent, current 102,979 82,959
Days delinquent, past due $ 315 $ 356
% based on $, past due 0.30% 0.43%
Consumer loans | Consumer | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 174 $ 121
Consumer loans | Consumer | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 2 11
Consumer loans | Consumer | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 139 $ 224