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Allowance for Loan Losses - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 12,959,272 | $ 13,312,388
Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 7,044,426 | 6,564,698
Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 1,538,240 | 1,422,674
Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 1,884,688 | 1,631,170
Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,115,513 | 1,268,695
Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 1,352,414 | 2,038,052
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 153,571 | 204,107
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 5,914,846 | 6,747,690
Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 295,953 | 540,741
Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 5,293,962 | 5,835,194
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 101,394 | 99,694
Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 140,222 | 142,178
Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 83,315 | 129,883
Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 12,930,216 | $ 13,278,657
% of Total Loans | 99.80% | 99.70%
Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 7,038,657 | $ 6,557,402
% of Total Loans | 99.90% | 99.90%
Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 1,538,240 | $ 1,422,674
% of Total Loans | 100.00% | 100.00%
Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 1,880,917 | $ 1,625,335
% of Total Loans | 99.80% | 99.60%
Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,115,184 | $ 1,267,403
% of Total Loans | 100.00% | 99.90%
Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 1,350,745 | $ 2,038,052
% of Total Loans | 99.90% | 100.00%
Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 153,571 | $ 203,938
% of Total Loans | 100.00% | 99.90%
Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 5,891,559 | $ 6,721,255
% of Total Loans | 99.60% | 99.60%
Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 295,953 | $ 540,741
% of Total Loans | 100.00% | 100.00%
Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 5,271,531 | $ 5,809,923
% of Total Loans | 99.60% | 99.60%
Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 101,151 | $ 99,448
% of Total Loans | 99.80% | 99.80%
Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 139,669 | $ 141,271
% of Total Loans | 99.60% | 99.40%
Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 83,255 | $ 129,872
% of Total Loans | 99.90% | 100.00%
Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 29,056 | $ 33,731
% of Total Loans | 0.20% | 0.30%
Non-Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 5,769 | $ 7,296
% of Total Loans | 0.10% | 0.10%
Non-Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 0 | $ 0
% of Total Loans | 0.00% | 0.00%
Non-Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 3,771 | $ 5,835
% of Total Loans | 0.20% | 0.40%
Non-Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 329 | $ 1,292
% of Total Loans | 0.00% | 0.10%
Non-Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 1,669 | $ 0
% of Total Loans | 0.10% | 0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 0 | $ 169
% of Total Loans | 0.00% | 0.10%
Non-Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 23,287 | $ 26,435
% of Total Loans | 0.40% | 0.40%
Non-Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 0 | $ 0
% of Total Loans | 0.00% | 0.00%
Non-Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 22,431 | $ 25,271
% of Total Loans | 0.40% | 0.40%
Non-Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 243 | $ 246
% of Total Loans | 0.20% | 0.20%
Non-Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 553 | $ 907
% of Total Loans | 0.40% | 0.60%
Non-Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 60 | $ 11
% of Total Loans | 0.10% | 0.00%

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