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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 20,996,836	$ 17,653,757
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	11,717,725	10,507,610
Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	4,089,719	2,886,594
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	3,544,884	3,310,101
Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,283,922	2,315,318
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	1,623,496	1,838,936
Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	175,704	156,661
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	9,279,111	7,146,147
Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	223,377	324,451
Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	8,619,916	6,388,990
Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	114,256	124,842
Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	247,305	237,754
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	74,257	70,110
Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 20,936,030	$ 17,603,335
% of Total Loans	99.70%	99.70%
Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 11,677,778	$ 10,472,966
% of Total Loans	99.70%	99.70%
Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 4,081,342	$ 2,881,467
% of Total Loans	99.80%	99.80%
Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 3,517,862	$ 3,286,666
% of Total Loans	99.20%	99.30%
Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,279,486	$ 2,309,236
% of Total Loans	99.80%	99.70%
Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 1,623,496	$ 1,838,936
% of Total Loans	100.00%	100.00%
Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 175,592	$ 156,661
% of Total Loans	99.90%	100.00%
Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 9,258,252	$ 7,130,369
% of Total Loans	99.80%	99.80%
Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 223,289	$ 324,363
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,599,900	$ 6,374,072
% of Total Loans	99.80%	99.80%
Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 114,256	$ 124,833
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 246,814	$ 237,018
% of Total Loans	99.80%	99.70%
Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 73,993	$ 70,083
% of Total Loans	99.60%	100.00%
Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 60,806	$ 50,422
% of Total Loans	0.30%	0.30%
Non-Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 39,947	$ 34,644
% of Total Loans	0.30%	0.30%
Non-Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,377	$ 5,127
% of Total Loans	0.20%	0.20%
Non-Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 27,022	$ 23,435
% of Total Loans	0.80%	0.70%
Non-Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 4,436	$ 6,082
% of Total Loans	0.20%	0.30%
Non-Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 112	$ 0
% of Total Loans	0.10%	0.00%
Non-Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 20,859	$ 15,778
% of Total Loans	0.20%	0.20%
Non-Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 88	$ 88
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 20,016	$ 14,918
% of Total Loans	0.20%	0.20%
Non-Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 9
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 491	$ 736
% of Total Loans	0.20%	0.30%
Non-Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 264	$ 27
% of Total Loans	0.40%	0.00%

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

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Grade as Percentage of Total Gross Loans

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No definition available.

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