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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%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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