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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 15,266,310 | $ 14,004,870
Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 9,106,457 | 8,316,591
Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,377,657 | 2,273,689
Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,808,628 | 2,429,332
Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,497,008 | 2,303,927
Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 1,212,103 | 1,117,227
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 211,061 | 192,416
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 6,159,853 | 5,688,279
Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 344,113 | 347,752
Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 5,418,645 | 4,937,064
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 153,549 | 148,534
Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 175,929 | 166,940
Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 67,617 | 87,989
Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 15,232,671 | $ 13,973,121
% of Total Loans | 99.80% | 99.80%
Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 9,092,573 | $ 8,304,868
% of Total Loans | 99.80% | 99.90%
Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,377,657 | $ 2,273,214
% of Total Loans | 100.00% | 100.00%
Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,802,216 | $ 2,421,294
% of Total Loans | 99.80% | 99.70%
Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,492,219 | $ 2,303,562
% of Total Loans | 99.80% | 100.00%
Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 1,211,760 | $ 1,116,722
% of Total Loans | 100.00% | 100.00%
Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 208,721 | $ 190,076
% of Total Loans | 98.90% | 98.80%
Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 6,140,098 | $ 5,668,253
% of Total Loans | 99.70% | 99.60%
Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 343,648 | $ 347,752
% of Total Loans | 99.90% | 100.00%
Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 5,400,033 | $ 4,917,744
% of Total Loans | 99.70% | 99.60%
Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 153,239 | $ 148,175
% of Total Loans | 99.80% | 99.80%
Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 175,600 | $ 166,653
% of Total Loans | 99.80% | 99.80%
Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 67,578 | $ 87,929
% of Total Loans | 99.90% | 99.90%
Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 33,639 | $ 31,749
% of Total Loans | 0.20% | 0.20%
Non-Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 13,884 | $ 11,723
% of Total Loans | 0.20% | 0.10%
Non-Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 0 | $ 475
% of Total Loans | 0.00% | 0.00%
Non-Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 6,412 | $ 8,038
% of Total Loans | 0.20% | 0.30%
Non-Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 4,789 | $ 365
% of Total Loans | 0.20% | 0.00%
Non-Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 343 | $ 505
% of Total Loans | 0.00% | 0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,340 | $ 2,340
% of Total Loans | 1.10% | 1.20%
Non-Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 19,755 | $ 20,026
% of Total Loans | 0.30% | 0.40%
Non-Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 465 | $ 0
% of Total Loans | 0.10% | 0.00%
Non-Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 18,612 | $ 19,320
% of Total Loans | 0.30% | 0.40%
Non-Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 310 | $ 359
% of Total Loans | 0.20% | 0.20%
Non-Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 329 | $ 287
% of Total Loans | 0.20% | 0.20%
Non-Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 39 | $ 60
% of Total Loans | 0.10% | 0.10%

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