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Allowance for Losses on Loans - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 21,265,023	$ 21,120,107
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	12,284,931	12,205,420
Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	4,740,797	4,556,200
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	3,610,758	3,732,155
Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,403,719	2,332,732
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	1,383,048	1,424,016
Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	146,609	160,317
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	8,980,092	8,914,687
Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	155,714	182,415
Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	8,362,881	8,280,300
Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	106,489	108,060
Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	279,039	269,857
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	75,969	74,055
Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 21,192,536	$ 21,050,566
% of Total Loans	99.70%	99.70%
Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 12,231,975	$ 12,159,121
% of Total Loans	99.60%	99.60%
Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 4,716,720	$ 4,537,457
% of Total Loans	99.50%	99.60%
Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 3,584,466	$ 3,705,793
% of Total Loans	99.30%	99.30%
Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,401,756	$ 2,332,732
% of Total Loans	99.90%	100.00%
Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 1,382,424	$ 1,422,896
% of Total Loans	100.00%	99.90%
Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 146,609	$ 160,243
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,960,561	$ 8,891,445
% of Total Loans	99.80%	99.70%
Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 154,866	$ 181,567
% of Total Loans	99.50%	99.50%
Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,345,441	$ 8,258,812
% of Total Loans	99.80%	99.70%
Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 106,481	$ 108,060
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 278,253	$ 269,261
% of Total Loans	99.70%	99.80%
Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 75,520	$ 73,745
% of Total Loans	99.40%	99.60%
Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 72,487	$ 69,541
% of Total Loans	0.30%	0.30%
Non-Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 52,956	$ 46,299
% of Total Loans	0.40%	0.40%
Non-Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 24,077	$ 18,743
% of Total Loans	0.50%	0.40%
Non-Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 26,292	$ 26,362
% of Total Loans	0.70%	0.70%
Non-Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 1,963	$ 0
% of Total Loans	0.10%	0.00%
Non-Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 624	$ 1,120
% of Total Loans	0.00%	0.10%
Non-Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 74
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 19,531	$ 23,242
% of Total Loans	0.20%	0.30%
Non-Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 848	$ 848
% of Total Loans	0.50%	0.50%
Non-Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 17,440	$ 21,488
% of Total Loans	0.20%	0.30%
Non-Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 786	$ 596
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 449	$ 310
% of Total Loans	0.60%	0.40%

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- Definition

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

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No definition available.

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