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Loans Receivable - Loans Based on Credit Quality Indicators (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 771,470	$ 2,351,822
Year before current fiscal year	2,845,113	2,646,527
Two years before current fiscal year	2,530,000	1,316,898
Three years before current fiscal year	1,239,813	574,962
Four years before current fiscal year	516,214	422,204
More than five years before current fiscal year	1,277,596	1,120,742
Revolving Loans	1,292,844	1,295,091
Revolving to Term Loans	34,560	255
Total Loans	10,507,610	9,728,501
Commercial loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	768,070	2,343,088
Year before current fiscal year	2,732,691	2,630,037
Two years before current fiscal year	2,501,906	1,299,292
Three years before current fiscal year	1,210,070	539,354
Four years before current fiscal year	469,897	409,574
More than five years before current fiscal year	1,190,162	1,082,730
Revolving Loans	1,219,189	1,204,597
Revolving to Term Loans	27,681	255
Total Loans	10,119,666	9,508,927
Commercial loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	2,503
Year before current fiscal year	90,428	1,594
Two years before current fiscal year	788	0
Three years before current fiscal year	0	0
Four years before current fiscal year	6,999	0
More than five years before current fiscal year	0	0
Revolving Loans	3,707	29,153
Revolving to Term Loans	0	0
Total Loans	101,922	33,250
Commercial loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,400	6,231
Year before current fiscal year	21,994	14,896
Two years before current fiscal year	27,306	17,606
Three years before current fiscal year	29,743	35,608
Four years before current fiscal year	39,318	12,630
More than five years before current fiscal year	87,434	38,012
Revolving Loans	69,948	61,341
Revolving to Term Loans	6,879	0
Total Loans	286,022	186,324
Commercial loans | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	135,859	661,095
Year before current fiscal year	754,265	778,936
Two years before current fiscal year	853,307	502,646
Three years before current fiscal year	544,077	168,568
Four years before current fiscal year	143,548	163,704
More than five years before current fiscal year	406,015	317,428
Revolving Loans	49,523	34,102
Revolving to Term Loans	0	0
Total Loans	2,886,594	2,626,479
Commercial loans | Multi-family | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	135,859	657,144
Year before current fiscal year	658,126	778,936
Two years before current fiscal year	850,998	500,917
Three years before current fiscal year	541,655	168,568
Four years before current fiscal year	135,965	157,144
More than five years before current fiscal year	400,412	315,858
Revolving Loans	49,523	34,102
Revolving to Term Loans	0	0
Total Loans	2,772,538	2,612,669
Commercial loans | Multi-family | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0
Year before current fiscal year	90,428
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	0
More than five years before current fiscal year	0
Revolving Loans	0
Revolving to Term Loans	0
Total Loans	90,428
Commercial loans | Multi-family | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	3,951
Year before current fiscal year	5,711	0
Two years before current fiscal year	2,309	1,729
Three years before current fiscal year	2,422	0
Four years before current fiscal year	7,583	6,560
More than five years before current fiscal year	5,603	1,570
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	23,628	13,810
Commercial loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	221,556	820,749
Year before current fiscal year	918,137	680,915
Two years before current fiscal year	739,667	498,900
Three years before current fiscal year	501,479	331,612
Four years before current fiscal year	294,920	223,028
More than five years before current fiscal year	631,993	551,931
Revolving Loans	2,349	3,977
Revolving to Term Loans	0	0
Total Loans	3,310,101	3,111,112
Commercial loans | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	221,057	820,490
Year before current fiscal year	912,776	679,321
Two years before current fiscal year	735,069	492,826
Three years before current fiscal year	476,941	301,033
Four years before current fiscal year	262,945	218,171
More than five years before current fiscal year	596,459	541,008
Revolving Loans	2,349	1,391
Revolving to Term Loans	0	0
Total Loans	3,207,596	3,054,240
Commercial loans | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	1,594
Two years before current fiscal year	788	0
Three years before current fiscal year	0	0
Four years before current fiscal year	4,059	0
More than five years before current fiscal year	0	0
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	4,847	1,594
Commercial loans | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	499	259
Year before current fiscal year	5,361	0
Two years before current fiscal year	3,810	6,074
Three years before current fiscal year	24,538	30,579
Four years before current fiscal year	27,916	4,857
More than five years before current fiscal year	35,534	10,923
Revolving Loans	0	2,586
Revolving to Term Loans	0	0
Total Loans	97,658	55,278
Commercial loans | Commercial & industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	155,411	259,192
Year before current fiscal year	264,330	448,269
Two years before current fiscal year	325,250	155,602
Three years before current fiscal year	119,872	44,131
Four years before current fiscal year	31,005	26,922
More than five years before current fiscal year	221,339	223,428
Revolving Loans	1,163,551	1,185,604
Revolving to Term Loans	34,560	255
Total Loans	2,315,318	2,343,403
Commercial loans | Commercial & industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	155,411	254,668
Year before current fiscal year	258,798	435,630
Two years before current fiscal year	316,713	145,799
Three years before current fiscal year	117,089	39,102
Four years before current fiscal year	24,246	25,709
More than five years before current fiscal year	175,042	197,909
Revolving Loans	1,089,896	1,097,696
Revolving to Term Loans	27,681	255
Total Loans	2,164,876	2,196,768
Commercial loans | Commercial & industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	2,503
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	2,940	0
More than five years before current fiscal year	0	0
Revolving Loans	3,707	29,153
Revolving to Term Loans	0	0
Total Loans	6,647	31,656
Commercial loans | Commercial & industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	2,021
Year before current fiscal year	5,532	12,639
Two years before current fiscal year	8,537	9,803
Three years before current fiscal year	2,783	5,029
Four years before current fiscal year	3,819	1,213
More than five years before current fiscal year	46,297	25,519
Revolving Loans	69,948	58,755
Revolving to Term Loans	6,879	0
Total Loans	143,795	114,979
Commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	238,051	510,764
Year before current fiscal year	838,696	673,868
Two years before current fiscal year	572,500	142,816
Three years before current fiscal year	68,105	27,260
Four years before current fiscal year	46,390	375
More than five years before current fiscal year	373	0
Revolving Loans	74,821	68,808
Revolving to Term Loans	0	0
Total Loans	1,838,936	1,423,891
Commercial loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	235,150	510,764
Year before current fiscal year	833,577	671,611
Two years before current fiscal year	559,850	142,816
Three years before current fiscal year	68,105	27,260
Four years before current fiscal year	46,390	375
More than five years before current fiscal year	373	0
Revolving Loans	74,821	68,808
Revolving to Term Loans	0	0
Total Loans	1,818,266	1,421,634
Commercial loans | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	2,901	0
Year before current fiscal year	5,119	2,257
Two years before current fiscal year	12,650	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	0	0
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	20,670	2,257
Commercial loans | Land - acquisition & development
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20,593	100,022
Year before current fiscal year	69,685	64,539
Two years before current fiscal year	39,276	16,934
Three years before current fiscal year	6,280	3,391
Four years before current fiscal year	351	8,175
More than five years before current fiscal year	17,876	27,955
Revolving Loans	2,600	2,600
Revolving to Term Loans	0	0
Total Loans	156,661	223,616
Commercial loans | Land - acquisition & development | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20,593	100,022
Year before current fiscal year	69,414	64,539
Two years before current fiscal year	39,276	16,934
Three years before current fiscal year	6,280	3,391
Four years before current fiscal year	351	8,175
More than five years before current fiscal year	17,876	27,955
Revolving Loans	2,600	2,600
Revolving to Term Loans	0	0
Total Loans	156,390	223,616
Commercial loans | Land - acquisition & development | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0
Year before current fiscal year	271
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	0
More than five years before current fiscal year	0
Revolving Loans	0
Revolving to Term Loans	0
Total Loans	271
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	625,700	1,420,965
Year before current fiscal year	1,743,204	1,873,721
Two years before current fiscal year	1,776,345	806,033
Three years before current fiscal year	743,758	328,430
Four years before current fiscal year	300,626	303,923
More than five years before current fiscal year	1,694,901	1,598,038
Revolving Loans	259,975	225,772
Revolving to Term Loans	1,638	989
Total Loans	7,146,147	6,557,871
Consumer loans | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	624,878	1,420,964
Year before current fiscal year	1,739,246	1,873,286
Two years before current fiscal year	1,772,797	805,494
Three years before current fiscal year	738,016	327,315
Four years before current fiscal year	300,376	303,923
More than five years before current fiscal year	1,680,457	1,581,180
Revolving Loans	258,283	225,461
Revolving to Term Loans	1,637	989
Total Loans	7,115,690	6,538,612
Consumer loans | 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	822	0
Year before current fiscal year	875	0
Two years before current fiscal year	1,217	400
Three years before current fiscal year	392	606
Four years before current fiscal year	221	0
More than five years before current fiscal year	4,301	2,040
Revolving Loans	1,009	67
Revolving to Term Loans	0	0
Total Loans	8,837	3,113
Consumer loans | 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	1,526	0
Two years before current fiscal year	1,665	139
Three years before current fiscal year	3,942	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	2,217	1,362
Revolving Loans	1	17
Revolving to Term Loans	0	0
Total Loans	9,351	1,518
Consumer loans | 90+ days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	1
Year before current fiscal year	1,557	435
Two years before current fiscal year	666	0
Three years before current fiscal year	1,408	509
Four years before current fiscal year	29	0
More than five years before current fiscal year	7,926	13,456
Revolving Loans	682	227
Revolving to Term Loans	1	0
Total Loans	12,269	14,628
Consumer loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	92,081	235,030
Year before current fiscal year	219,835	150,869
Two years before current fiscal year	8,838	9,811
Three years before current fiscal year	2,860	1,155
Four years before current fiscal year	358	478
More than five years before current fiscal year	479	0
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	324,451	397,343
Consumer loans | Construction | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	92,081	235,030
Year before current fiscal year	218,988	150,434
Two years before current fiscal year	8,838	9,811
Three years before current fiscal year	243	1,155
Four years before current fiscal year	358	478
More than five years before current fiscal year	479	0
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	320,987	396,908
Consumer loans | Construction | 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0
Year before current fiscal year	760
Two years before current fiscal year	0
Three years before current fiscal year	0
Four years before current fiscal year	0
More than five years before current fiscal year	0
Revolving Loans	0
Revolving to Term Loans	0
Total Loans	760
Consumer loans | Construction | 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0
Year before current fiscal year	0
Two years before current fiscal year	0
Three years before current fiscal year	2,617
Four years before current fiscal year	0
More than five years before current fiscal year	0
Revolving Loans	0
Revolving to Term Loans	0
Total Loans	2,617
Consumer loans | Construction | 90+ days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	87	435
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	0	0
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	87	435
Consumer loans | Single-family residential
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	513,829	1,131,152
Year before current fiscal year	1,481,590	1,652,242
Two years before current fiscal year	1,722,108	772,169
Three years before current fiscal year	721,375	321,627
Four years before current fiscal year	296,057	276,093
More than five years before current fiscal year	1,654,031	1,573,696
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	6,388,990	5,726,979
Consumer loans | Single-family residential | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	513,007	1,131,152
Year before current fiscal year	1,478,479	1,652,242
Two years before current fiscal year	1,719,163	771,769
Three years before current fiscal year	718,250	320,546
Four years before current fiscal year	295,836	276,093
More than five years before current fiscal year	1,640,330	1,557,194
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	6,365,065	5,708,996
Consumer loans | Single-family residential | 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	822	0
Year before current fiscal year	115	0
Two years before current fiscal year	859	400
Three years before current fiscal year	392	604
Four years before current fiscal year	221	0
More than five years before current fiscal year	4,032	1,792
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	6,441	2,796
Consumer loans | Single-family residential | 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	1,526	0
Two years before current fiscal year	1,420	0
Three years before current fiscal year	1,325	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	1,797	1,316
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	6,068	1,316
Consumer loans | Single-family residential | 90+ days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	1,470	0
Two years before current fiscal year	666	0
Three years before current fiscal year	1,408	477
Four years before current fiscal year	0	0
More than five years before current fiscal year	7,872	13,394
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	11,416	13,871
Consumer loans | Land - consumer lot loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,128	53,396
Year before current fiscal year	41,658	60,454
Two years before current fiscal year	35,651	16,015
Three years before current fiscal year	11,517	5,399
Four years before current fiscal year	4,166	3,433
More than five years before current fiscal year	12,722	13,248
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	124,842	151,945
Consumer loans | Land - consumer lot loans | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,128	53,396
Year before current fiscal year	41,658	60,454
Two years before current fiscal year	35,048	15,876
Three years before current fiscal year	11,517	5,399
Four years before current fiscal year	4,166	3,433
More than five years before current fiscal year	12,714	13,188
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	124,231	151,746
Consumer loans | Land - consumer lot loans | 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0
Year before current fiscal year	0
Two years before current fiscal year	358
Three years before current fiscal year	0
Four years before current fiscal year	0
More than five years before current fiscal year	0
Revolving Loans	0
Revolving to Term Loans	0
Total Loans	358
Consumer loans | Land - consumer lot loans | 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	245	139
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	0	0
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	245	139
Consumer loans | Land - consumer lot loans | 90+ days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	8	60
Revolving Loans	0	0
Revolving to Term Loans	0	0
Total Loans	8	60
Consumer loans | HELOC
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	4,091	4,473
Revolving Loans	232,026	200,571
Revolving to Term Loans	1,637	989
Total Loans	237,754	206,033
Consumer loans | HELOC | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	3,733	4,349
Revolving Loans	230,338	200,267
Revolving to Term Loans	1,637	989
Total Loans	235,708	205,605
Consumer loans | HELOC | 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	44	95
Revolving Loans	1,006	60
Revolving to Term Loans	0	0
Total Loans	1,050	155
Consumer loans | HELOC | 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	314	29
Revolving Loans	0	17
Revolving to Term Loans	0	0
Total Loans	314	46
Consumer loans | HELOC | 90+ days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	0	0
Revolving Loans	682	227
Revolving to Term Loans	0	0
Total Loans	682	227
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	662	1,387
Year before current fiscal year	121	10,156
Two years before current fiscal year	9,748	8,038
Three years before current fiscal year	8,006	249
Four years before current fiscal year	45	23,919
More than five years before current fiscal year	23,578	6,621
Revolving Loans	27,949	25,201
Revolving to Term Loans	1	0
Total Loans	70,110	75,571
Consumer loans | Consumer | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	662	1,386
Year before current fiscal year	121	10,156
Two years before current fiscal year	9,748	8,038
Three years before current fiscal year	8,006	215
Four years before current fiscal year	16	23,919
More than five years before current fiscal year	23,201	6,449
Revolving Loans	27,945	25,194
Revolving to Term Loans	0	0
Total Loans	69,699	75,357
Consumer loans | Consumer | 30 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	2
Four years before current fiscal year	0	0
More than five years before current fiscal year	225	153
Revolving Loans	3	7
Revolving to Term Loans	0	0
Total Loans	228	162
Consumer loans | Consumer | 60 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	0
Four years before current fiscal year	0	0
More than five years before current fiscal year	106	17
Revolving Loans	1	0
Revolving to Term Loans	0	0
Total Loans	107	17
Consumer loans | Consumer | 90+ days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	1
Year before current fiscal year	0	0
Two years before current fiscal year	0	0
Three years before current fiscal year	0	32
Four years before current fiscal year	29	0
More than five years before current fiscal year	46	2
Revolving Loans	0	0
Revolving to Term Loans	1	0
Total Loans	$ 76	$ 35

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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