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Loans Receivable - Loan Delinquencies by Loan Portfolio and Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) $ 13,051,199 $ 12,959,272
Days delinquent, current 12,983,037 12,928,463
Days delinquent, past due $ 68,162 $ 30,809
% based on $, current 99.48% 99.76%
% based on $, past due 0.52% 0.24%
30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 12,133 $ 4,470
% based on $, past due 0.09% 0.03%
60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 10,141 $ 3,973
% based on $, past due 0.08% 0.03%
90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 45,888 $ 22,366
% based on $, past due 0.35% 0.17%
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) $ 7,341,847 $ 7,044,426
Days delinquent, current 7,307,774 7,041,423
Days delinquent, past due $ 34,073 $ 3,003
% based on $, past due 0.46% 0.04%
Commercial loans | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 3,578 $ 0
Commercial loans | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 3,958 778
Commercial loans | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 26,537 2,225
Commercial loans | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 1,609,800 1,538,240
Days delinquent, current 1,609,325 1,538,240
Days delinquent, past due $ 475 $ 0
% based on $, past due 0.03% 0.00%
Commercial loans | Multi-family | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 475 $ 0
Commercial loans | Multi-family | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 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) 1,942,854 1,884,688
Days delinquent, current 1,914,254 1,884,210
Days delinquent, past due $ 28,600 $ 478
% based on $, past due 1.47% 0.03%
Commercial loans | Commercial real estate | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 85 $ 0
Commercial loans | Commercial real estate | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 3,958 195
Commercial loans | Commercial real estate | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 24,557 283
Commercial loans | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 2,243,465 2,115,513
Days delinquent, current 2,242,422 2,114,650
Days delinquent, past due $ 1,043 $ 863
% based on $, past due 0.05% 0.04%
Commercial loans | Commercial and Industrial [Member] | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 216 $ 0
Commercial loans | Commercial and Industrial [Member] | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 0 583
Commercial loans | Commercial and Industrial [Member] | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 827 280
Commercial loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 1,393,107 1,352,414
Days delinquent, current 1,389,404 1,350,752
Days delinquent, past due $ 3,703 $ 1,662
% based on $, past due 0.27% 0.12%
Commercial loans | Construction | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 2,550 $ 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) 152,621 153,571
Days delinquent, current 152,369 153,571
Days delinquent, past due $ 252 $ 0
% based on $, past due 0.17% 0.00%
Commercial loans | Land - acquisition & development | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 252 $ 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 0 0
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 5,709,352 5,914,846
Days delinquent, current 5,675,263 5,887,040
Days delinquent, past due $ 34,089 $ 27,806
% based on $, past due 0.60% 0.47%
Consumer loans | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 8,555 $ 4,470
Consumer loans | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 6,183 3,195
Consumer loans | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 19,351 20,141
Consumer loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 299,351 295,953
Days delinquent, current 299,351 295,953
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) 5,048,435 5,293,962
Days delinquent, current 5,016,530 5,267,608
Days delinquent, past due $ 31,905 $ 26,354
% based on $, past due 0.63% 0.50%
Consumer loans | Single-family residential | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 7,477 $ 3,922
Consumer loans | Single-family residential | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 5,872 3,108
Consumer loans | Single-family residential | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 18,556 19,324
Consumer loans | Land - consumer lot loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 109,845 101,394
Days delinquent, current 109,248 101,029
Days delinquent, past due $ 597 $ 365
% based on $, past due 0.54% 0.36%
Consumer loans | Land - consumer lot loans | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 95 $ 152
Consumer loans | Land - consumer lot loans | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 168 0
Consumer loans | Land - consumer lot loans | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 334 213
Consumer loans | HELOC    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 140,272 140,222
Days delinquent, current 138,933 139,491
Days delinquent, past due $ 1,339 $ 731
% based on $, past due 0.95% 0.52%
Consumer loans | HELOC | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 916 $ 275
Consumer loans | HELOC | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 116 76
Consumer loans | HELOC | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 307 380
Consumer loans | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable (amortized cost) 111,449 83,315
Days delinquent, current 111,201 82,959
Days delinquent, past due $ 248 $ 356
% based on $, past due 0.22% 0.43%
Consumer loans | Consumer | 30 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 67 $ 121
Consumer loans | Consumer | 60 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due 27 11
Consumer loans | Consumer | 90 Days Delinquent    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Days delinquent, past due $ 154 $ 224