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Loans Receivable - Loans Receivable, Analysis of Age of Loans in Past Due Status (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 12,959,272 | $ 12,111,047
Current | 12,928,463 | 12,075,677
Total delinquent | $ 30,809 | $ 35,370
Delinquency %, current | 99.76% | 99.71%
% based on $, past due | 0.24% | 0.29%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 4,470 | $ 6,273
% based on $, past due | 0.03% | 0.05%
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 3,973 | $ 4,415
% based on $, past due | 0.03% | 0.04%
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 22,366 | $ 24,682
% based on $, past due | 0.17% | 0.20%
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | $ 7,044,426 | $ 5,648,601
Current | 7,041,423 | 5,642,072
Total delinquent | $ 3,003 | $ 6,529
% based on $, past due | 0.04% | 0.12%
Commercial loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 0 | $ 1,614
Commercial loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 778 | 285
Commercial loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 2,225 | 4,630
Commercial loans | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,538,240 | 1,422,652
Current | 1,538,240 | 1,422,652
Total delinquent | $ 0 | $ 0
% based on $, past due | 0.00% | 0.00%
Commercial loans | Multi-family | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 0 | $ 0
Commercial loans | Multi-family | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
Commercial loans | Multi-family | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
Commercial loans | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,884,688 | 1,631,171
Current | 1,884,210 | 1,625,509
Total delinquent | $ 478 | $ 5,662
% based on $, past due | 0.03% | 0.35%
Commercial loans | Commercial real estate | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 0 | $ 1,614
Commercial loans | Commercial real estate | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 195 | 285
Commercial loans | Commercial real estate | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 283 | 3,763
Commercial loans | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 2,115,513 | 1,268,695
Current | 2,114,650 | 1,267,828
Total delinquent | $ 863 | $ 867
% based on $, past due | 0.04% | 0.07%
Commercial loans | Commercial & industrial | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 0 | $ 0
Commercial loans | Commercial & industrial | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 583 | 0
Commercial loans | Commercial & industrial | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 280 | 867
Commercial loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 1,352,414 | 1,164,889
Current | 1,350,752 | 1,164,889
Total delinquent | $ 1,662 | $ 0
% based on $, past due | 0.12% | 0.00%
Commercial loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 0 | $ 0
Commercial loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
Commercial loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 1,662 | 0
Commercial loans | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 153,571 | 161,194
Current | 153,571 | 161,194
Total delinquent | $ 0 | $ 0
% based on $, past due | 0.00% | 0.00%
Commercial loans | Land - acquisition & development | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 0 | $ 0
Commercial loans | Land - acquisition & development | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
Commercial loans | Land - acquisition & development | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
Consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 5,914,846 | 6,462,446
Current | 5,887,040 | 6,433,605
Total delinquent | $ 27,806 | $ 28,841
% based on $, past due | 0.47% | 0.45%
Consumer loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 4,470 | $ 4,659
Consumer loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 3,195 | 4,130
Consumer loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 20,141 | 20,052
Consumer loans | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 295,953 | 255,505
Current | 295,953 | 255,505
Total delinquent | $ 0 | $ 0
% based on $, past due | 0.00% | 0.00%
Consumer loans | Construction | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 0 | $ 0
Consumer loans | Construction | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
Consumer loans | Construction | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
Consumer loans | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 5,293,962 | 5,835,186
Current | 5,267,608 | 5,809,239
Total delinquent | $ 26,354 | $ 25,947
% based on $, past due | 0.50% | 0.44%
Consumer loans | Single-family residential | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 3,922 | $ 3,672
Consumer loans | Single-family residential | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 3,108 | 3,211
Consumer loans | Single-family residential | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 19,324 | 19,064
Consumer loans | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 101,394 | 99,694
Current | 101,029 | 98,916
Total delinquent | $ 365 | $ 778
% based on $, past due | 0.36% | 0.78%
Consumer loans | Land - consumer lot loans | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 152 | $ 112
Consumer loans | Land - consumer lot loans | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 619
Consumer loans | Land - consumer lot loans | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 213 | 47
Consumer loans | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 140,222 | 142,178
Current | 139,491 | 140,718
Total delinquent | $ 731 | $ 1,460
% based on $, past due | 0.52% | 1.03%
Consumer loans | HELOC | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 275 | $ 580
Consumer loans | HELOC | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 76 | 183
Consumer loans | HELOC | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 380 | 697
Consumer loans | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans receivable, net of loans in process | 83,315 | 129,883
Current | 82,959 | 129,227
Total delinquent | $ 356 | $ 656
% based on $, past due | 0.43% | 0.51%
Consumer loans | Consumer | 30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 121 | $ 295
Consumer loans | Consumer | 60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 11 | 117
Consumer loans | Consumer | 90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 224 | $ 244

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