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Allowance for Loan Losses - Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 14,004,870	$ 12,959,272
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	8,316,591	7,044,426
Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,273,689	1,538,240
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,429,332	1,884,688
Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	2,303,927	2,115,513
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	1,117,227	1,352,414
Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	192,416	153,571
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	5,688,279	5,914,846
Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	347,752	295,953
Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	4,937,064	5,293,962
Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	148,534	101,394
Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	166,940	140,222
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	87,989	83,315
Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 13,973,121	$ 12,930,216
% of Total Loans	99.80%	99.80%
Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,304,868	$ 7,038,657
% of Total Loans	99.90%	99.90%
Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,273,214	$ 1,538,240
% of Total Loans	100.00%	100.00%
Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,421,294	$ 1,880,917
% of Total Loans	99.70%	99.80%
Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,303,562	$ 2,115,184
% of Total Loans	100.00%	100.00%
Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 1,116,722	$ 1,350,745
% of Total Loans	100.00%	99.90%
Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 190,076	$ 153,571
% of Total Loans	98.80%	100.00%
Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 5,668,253	$ 5,891,559
% of Total Loans	99.60%	99.60%
Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 347,752	$ 295,953
% of Total Loans	100.00%	100.00%
Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 4,917,744	$ 5,271,531
% of Total Loans	99.60%	99.60%
Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 148,175	$ 101,151
% of Total Loans	99.80%	99.80%
Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 166,653	$ 139,669
% of Total Loans	99.80%	99.60%
Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 87,929	$ 83,255
% of Total Loans	99.90%	99.90%
Non-Performing Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 31,749	$ 29,056
% of Total Loans	0.20%	0.20%
Non-Performing Loans | Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 11,723	$ 5,769
% of Total Loans	0.10%	0.10%
Non-Performing Loans | Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 475	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 8,038	$ 3,771
% of Total Loans	0.30%	0.20%
Non-Performing Loans | Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 365	$ 329
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 505	$ 1,669
% of Total Loans	0.00%	0.10%
Non-Performing Loans | Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 2,340	$ 0
% of Total Loans	1.20%	0.00%
Non-Performing Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 20,026	$ 23,287
% of Total Loans	0.40%	0.40%
Non-Performing Loans | Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 0	$ 0
% of Total Loans	0.00%	0.00%
Non-Performing Loans | Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 19,320	$ 22,431
% of Total Loans	0.40%	0.40%
Non-Performing Loans | Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 359	$ 243
% of Total Loans	0.20%	0.20%
Non-Performing Loans | Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 287	$ 553
% of Total Loans	0.20%	0.40%
Non-Performing Loans | Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Amount	$ 60	$ 60
% of Total Loans	0.10%	0.10%

X

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Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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-Publisher FASB
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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