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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 15,736,144 | $ 14,004,870
Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 9,330,158 | 8,316,591
Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,478,932 | 2,273,689
Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,876,995 | 2,429,332
Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 2,344,046 | 2,303,927
Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 1,407,211 | 1,117,227
Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 222,974 | 192,416
Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 6,405,986 | 5,688,279
Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 368,839 | 347,752
Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 5,619,448 | 4,937,064
Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 157,076 | 148,534
Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 187,469 | 166,940
Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | 73,154 | 87,989
Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 15,699,465 | $ 13,973,121
% of Total Loans | 99.80% | 99.80%
Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 9,314,902 | $ 8,304,868
% of Total Loans | 99.80% | 99.90%
Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 2,472,988 | $ 2,273,214
% of Total Loans | 99.80% | 100.00%
Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 2,871,971 | $ 2,421,294
% of Total Loans | 99.80% | 99.70%
Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 2,339,758 | $ 2,303,562
% of Total Loans | 99.80% | 100.00%
Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 1,407,211 | $ 1,116,722
% of Total Loans | 100.00% | 100.00%
Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 222,974 | $ 190,076
% of Total Loans | 100.00% | 98.80%
Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 6,384,563 | $ 5,668,253
% of Total Loans | 99.70% | 99.60%
Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 367,939 | $ 347,752
% of Total Loans | 99.80% | 100.00%
Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 5,599,264 | $ 4,917,744
% of Total Loans | 99.60% | 99.60%
Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 156,863 | $ 148,175
% of Total Loans | 99.90% | 99.80%
Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 187,378 | $ 166,653
% of Total Loans | 100.00% | 99.80%
Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 73,119 | $ 87,929
% of Total Loans | 100.00% | 99.90%
Non-Performing Loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 36,679 | $ 31,749
% of Total Loans | 0.20% | 0.20%
Non-Performing Loans | Commercial loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 15,256 | $ 11,723
% of Total Loans | 0.20% | 0.10%
Non-Performing Loans | Commercial loans | Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 5,944 | $ 475
% of Total Loans | 0.20% | 0.00%
Non-Performing Loans | Commercial loans | Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 5,024 | $ 8,038
% of Total Loans | 0.20% | 0.30%
Non-Performing Loans | Commercial loans | Commercial & industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 4,288 | $ 365
% of Total Loans | 0.20% | 0.00%
Non-Performing Loans | Commercial loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 0 | $ 505
% of Total Loans | 0.00% | 0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 0 | $ 2,340
% of Total Loans | 0.00% | 1.20%
Non-Performing Loans | Consumer loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 21,423 | $ 20,026
% of Total Loans | 0.30% | 0.40%
Non-Performing Loans | Consumer loans | Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 900 | $ 0
% of Total Loans | 0.20% | 0.00%
Non-Performing Loans | Consumer loans | Single-family residential |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 20,184 | $ 19,320
% of Total Loans | 0.40% | 0.40%
Non-Performing Loans | Consumer loans | Land - consumer lot loans |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 213 | $ 359
% of Total Loans | 0.10% | 0.20%
Non-Performing Loans | Consumer loans | HELOC |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 91 | $ 287
% of Total Loans | 0.00% | 0.20%
Non-Performing Loans | Consumer loans | Consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Gross loans | $ 35 | $ 60
% of Total Loans | 0.00% | 0.10%

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