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Loans Receivable - Breakdown of Delinquent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 12,111,047 | $ 11,658,172
Current | 12,075,677 | 11,608,959
Total delinquent | $ 35,370 | $ 49,213
Ratio of total past due loans to total loans | 0.29% | 0.42%
Delinquency %, current | 99.71% | 99.58%
Delinquency %, past due | 0.29% | 0.42%
Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 5,835,186 | $ 5,798,353
Current | 5,809,239 | 5,768,253
Total delinquent | $ 25,947 | $ 30,100
Ratio of total past due loans to total loans | 0.44% | 0.52%
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 1,164,889 | $ 1,062,855
Current | 1,164,889 | 1,060,428
Total delinquent | $ 0 | $ 2,427
Ratio of total past due loans to total loans | 0.00% | 0.23%
Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 255,505 | $ 289,192
Current | 255,505 | 289,192
Total delinquent | $ 0 | $ 0
Ratio of total past due loans to total loans | 0.00% | 0.00%
Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 161,194 | $ 123,560
Current | 161,194 | 122,620
Total delinquent | $ 0 | $ 940
Ratio of total past due loans to total loans | 0.00% | 0.76%
Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 99,694 | $ 101,908
Current | 98,916 | 101,294
Total delinquent | $ 778 | $ 614
Ratio of total past due loans to total loans | 0.78% | 0.60%
Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 1,422,652 | $ 1,385,103
Current | 1,422,652 | 1,385,103
Total delinquent | $ 0 | $ 0
Ratio of total past due loans to total loans | 0.00% | 0.00%
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 1,631,171 | $ 1,452,169
Current | 1,625,509 | 1,448,946
Total delinquent | $ 5,662 | $ 3,223
Ratio of total past due loans to total loans | 0.35% | 0.22%
Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 1,268,695 | $ 1,140,874
Current | 1,267,828 | 1,130,836
Total delinquent | $ 867 | $ 10,038
Ratio of total past due loans to total loans | 0.07% | 0.88%
HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 142,178 | $ 130,852
Current | 140,718 | 129,510
Total delinquent | $ 1,460 | $ 1,342
Ratio of total past due loans to total loans | 1.03% | 1.03%
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Amount of loans net of loans in process | $ 129,883 | $ 173,306
Current | 129,227 | 172,777
Total delinquent | $ 656 | $ 529
Ratio of total past due loans to total loans | 0.51% | 0.31%
30 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 6,273 | $ 9,182
Delinquency %, past due | 0.05% | 0.08%
30 Days Delinquent | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 3,672 | $ 7,983
30 Days Delinquent | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
30 Days Delinquent | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
30 Days Delinquent | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
30 Days Delinquent | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 112 | 144
30 Days Delinquent | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
30 Days Delinquent | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 1,614 | 316
30 Days Delinquent | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
30 Days Delinquent | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 580 | 567
30 Days Delinquent | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 295 | 172
60 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 4,415 | $ 6,513
Delinquency %, past due | 0.04% | 0.06%
60 Days Delinquent | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 3,211 | $ 3,562
60 Days Delinquent | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
60 Days Delinquent | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
60 Days Delinquent | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 270
60 Days Delinquent | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 619 | 117
60 Days Delinquent | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
60 Days Delinquent | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 285 | 1,767
60 Days Delinquent | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
60 Days Delinquent | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 183 | 469
60 Days Delinquent | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 117 | 328
90 Days Delinquent |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 24,682 | $ 33,518
Delinquency %, past due | 0.20% | 0.29%
90 Days Delinquent | Single-family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 19,064 | $ 18,555
90 Days Delinquent | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 2,427
90 Days Delinquent | Construction - custom |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
90 Days Delinquent | Land - acquisition & development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 670
90 Days Delinquent | Land - consumer lot loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 47 | 353
90 Days Delinquent | Multi-family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 0 | 0
90 Days Delinquent | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 3,763 | 1,140
90 Days Delinquent | Commercial & industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 867 | 10,038
90 Days Delinquent | HELOC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | 697 | 306
90 Days Delinquent | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total delinquent | $ 244 | $ 29

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