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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 14,763,613 | $ 14,004,870
Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 8,748,073 | 8,316,591
Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,278,216 | 2,273,689
Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,667,170 | 2,429,332
Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 2,365,487 | 2,303,927
Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 1,235,119 | 1,117,227
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 202,081 | 192,416
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 6,015,540 | 5,688,279
Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 333,583 | 347,752
Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 5,286,559 | 4,937,064
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 149,845 | 148,534
Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 167,789 | 166,940
Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | 77,764 | 87,989
Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 14,718,654 | $ 13,973,121
% of Total Loans | 99.70% | 99.80%
Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 8,722,208 | $ 8,304,868
% of Total Loans | 99.70% | 99.90%
Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,278,216 | $ 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 | $ 2,659,605 | $ 2,421,294
% of Total Loans | 99.70% | 99.70%
Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 2,350,138 | $ 2,303,562
% of Total Loans | 99.40% | 100.00%
Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 1,234,508 | $ 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 | $ 199,741 | $ 190,076
% of Total Loans | 98.80% | 98.80%
Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 5,996,446 | $ 5,668,253
% of Total Loans | 99.70% | 99.60%
Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 333,118 | $ 347,752
% of Total Loans | 99.90% | 100.00%
Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 5,268,808 | $ 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 | $ 149,301 | $ 148,175
% of Total Loans | 99.60% | 99.80%
Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 167,513 | $ 166,653
% of Total Loans | 99.80% | 99.80%
Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 77,706 | $ 87,929
% of Total Loans | 99.90% | 99.90%
Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 44,959 | $ 31,749
% of Total Loans | 0.30% | 0.20%
Non-Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 25,865 | $ 11,723
% of Total Loans | 0.30% | 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 | $ 7,565 | $ 8,038
% of Total Loans | 0.30% | 0.30%
Non-Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 15,349 | $ 365
% of Total Loans | 0.60% | 0.00%
Non-Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 611 | $ 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 | 1.20% | 1.20%
Non-Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 19,094 | $ 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 | $ 17,751 | $ 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 | $ 544 | $ 359
% of Total Loans | 0.40% | 0.20%
Non-Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 276 | $ 287
% of Total Loans | 0.20% | 0.20%
Non-Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amount | $ 58 | $ 60
% of Total Loans | 0.10% | 0.10%

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