LOANS & ALLOWANCE FOR CREDIT LOSSES - LOANS BY AMORTIZED COST BASIS BY YEAR OF ORIGINATION AND CREDIT QUALITY INDICATOR (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2023	Jun. 30, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 979,382	$ 3,842,206
2023	3,622,894	5,386,784
2022	5,100,502	1,816,171
2021	1,721,831	867,067
2020	760,359	665,377
Prior	1,699,938	1,156,389
Revolving Loans	3,277,025	2,918,032
Total	17,161,931	$ 16,652,026
Gross charge-offs
2024	0
2023	711
2022	1,093
2021	378
2020	73
Prior	106
Revolving Loans	0
Total	$ 2,361
As a % of total gross loans
2024	5.71%	23.07%
2023	21.11%	32.35%
2022	29.72%	10.91%
2021	10.03%	5.21%
2020	4.43%	4.00%
Prior	9.91%	6.94%
Revolving Loans	19.09%	17.52%
Total	100.00%	100.00%
Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2024	$ 209,544	$ 730,498
2023	692,634	1,359,272
2022	1,334,900	534,585
2021	525,986	347,145
2020	339,236	270,513
Prior	916,528	682,031
Revolving Loans	295,078	249,789
Total	4,313,906	4,173,833
Gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	80
Revolving Loans	0
Total	80
Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9,328	558,787
2023	489,188	988,022
2022	988,008	509,066
2021	499,432	354,600
2020	335,928	238,478
Prior	640,097	433,272
Revolving Loans	0	0
Total	2,961,981	3,082,225
Gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total	0
Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	501,339	1,896,476
2023	1,867,923	2,395,722
2022	2,203,710	669,451
2021	602,443	114,016
2020	43,608	134,215
Prior	109,154	29,914
Revolving Loans	840,449	960,024
Total	6,168,626	6,199,818
Gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total	0
Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2024	248,136	488,120
2023	423,625	384,197
2022	337,121	30,809
2021	29,707	26,207
2020	20,027	2,098
Prior	8,855	0
Revolving Loans	2,141,498	1,708,219
Total	3,208,969	2,639,650
Gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total	0
Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2024	10,130	162,604
2023	149,524	257,571
2022	236,763	70,909
2021	63,033	25,099
2020	21,560	20,073
Prior	25,001	10,008
Revolving Loans	0	0
Total	506,011	546,264
Gross charge-offs
2024	0
2023	711
2022	1,093
2021	378
2020	73
Prior	26
Revolving Loans	0
Total	2,281
Other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	905	5,721
2023	0	2,000
2022	0	1,351
2021	1,230	0
2020	0	0
Prior	303	1,164
Revolving Loans	0	0
Total	2,438	10,236
Gross charge-offs
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans	0
Total	0
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
2024	979,382	3,812,433
2023	3,585,084	5,259,453
2022	4,916,728	1,754,423
2021	1,650,638	765,600
2020	664,573	620,062
Prior	1,540,060	1,054,716
Revolving Loans	3,264,979	2,910,818
Total	16,601,444	16,177,505
Pass \| Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2024	209,544	730,498
2023	673,266	1,346,804
2022	1,306,937	522,873
2021	514,928	324,458
2020	313,863	255,547
Prior	848,948	639,401
Revolving Loans	295,078	243,175
Total	4,162,564	4,062,756
Pass \| Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9,328	558,787
2023	478,469	975,186
2022	974,390	498,744
2021	479,725	314,383
2020	299,551	224,592
Prior	597,311	404,222
Revolving Loans	0	0
Total	2,838,774	2,975,914
Pass \| Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	501,339	1,867,476
2023	1,867,923	2,323,095
2022	2,113,338	631,500
2021	563,541	87,059
2020	20,737	117,928
Prior	62,928	0
Revolving Loans	840,449	960,024
Total	5,970,255	5,987,082
Pass \| Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2024	248,136	488,120
2023	416,819	358,214
2022	287,067	29,777
2021	28,675	14,794
2020	9,041	2,098
Prior	5,866	0
Revolving Loans	2,129,452	1,707,619
Total	3,125,056	2,600,622
Pass \| Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2024	10,130	161,831
2023	148,607	256,154
2022	234,996	70,223
2021	62,579	24,906
2020	21,381	19,897
Prior	24,704	9,929
Revolving Loans	0	0
Total	502,397	542,940
Pass \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	905	5,721
2023	0	0
2022	0	1,306
2021	1,190	0
2020	0	0
Prior	303	1,164
Revolving Loans	0	0
Total	2,398	8,191
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	29,423
2023	37,231	69,251
2022	100,134	12,115
2021	8,537	29,593
2020	31,269	21,461
Prior	52,690	33,312
Revolving Loans	12,046	7,214
Total	241,907	202,369
Special Mention \| Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	19,368	7,280
2022	18,998	7,026
2021	6,468	8,303
2020	11,028	12,942
Prior	36,745	18,244
Revolving Loans	0	6,614
Total	92,607	60,409
Special Mention \| Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	10,719	9,691
2022	0	4,636
2021	2,000	1,360
2020	1,358	7,705
Prior	0	0
Revolving Loans	0	0
Total	14,077	23,392
Special Mention \| Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	29,000
2023	0	43,427
2022	45,130	0
2021	0	8,457
2020	7,871	800
Prior	15,887	15,062
Revolving Loans	0
Total	68,888	96,746
Special Mention \| Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	6,806	8,221
2022	35,430	0
2021	0	11,413
2020	10,986	0
Prior	0	0
Revolving Loans	12,046	600
Total	65,268	20,234
Special Mention \| Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	423
2023	338	632
2022	576	453
2021	69	60
2020	26	14
Prior	58	6
Revolving Loans	0	0
Total	1,067	1,588
Special Mention \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	350
2023	579	58,080
2022	83,640	49,633
2021	62,656	71,874
2020	64,517	23,854
Prior	107,188	68,361
Revolving Loans	0	0
Total	318,580	272,152
Substandard \| Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	5,188
2022	8,965	4,686
2021	4,590	14,384
2020	14,345	2,024
Prior	30,835	24,386
Revolving Loans	0	0
Total	58,735	50,668
Substandard \| Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	3,145
2022	13,618	5,686
2021	17,707	38,857
2020	35,019	6,181
Prior	42,786	29,050
Revolving Loans	0	0
Total	109,130	82,919
Substandard \| Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	29,200
2022	45,242	37,951
2021	38,902	18,500
2020	15,000	15,487
Prior	30,339	14,852
Revolving Loans	0	0
Total	129,483	115,990
Substandard \| Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	17,762
2022	14,624	1,032
2021	1,032	0
2020	0	0
Prior	2,989	0
Revolving Loans	0	0
Total	18,645	18,794
Substandard \| Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	350
2023	579	785
2022	1,191	233
2021	385	133
2020	153	162
Prior	239	73
Revolving Loans	0	0
Total	2,547	1,736
Substandard \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	2,000
2022	0	45
2021	40	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	40	2,045
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful \| Single Family - Mortgage & Warehouse
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful \| Multifamily and Commercial Mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful \| Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful \| Commercial & Industrial - Non-RE
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful \| Auto & Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Doubtful \| Other
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans	0	0
Total	$ 0	$ 0

Financing Receivable, Ratio Of Grade Class To Gross Loans

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Financing Receivable, Ratio Of Grade Class To Gross Loans

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Financing Receivable, Ratio Of Grade Class To Gross Loans, Originated, More Than Five Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Grade Class To Gross Loans, Revolving

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Financing Receivable, Ratio Of Grade Class To Gross Loans, Year Five, Originated, Four Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Grade Class To Gross Loans, Year Four, Originated, Three Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Grade Class To Gross Loans, Year One, Originated, Current Fiscal Year

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Financing Receivable, Ratio Of Grade Class To Gross Loans, Year Three, Originated, Two Years Before Current Fiscal Year

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Financing Receivable, Ratio Of Grade Class To Gross Loans, Year Two, Originated, Fiscal Year Before Current Fiscal Year

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- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
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-Topic 326
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

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Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease.

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- Definition

Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn.

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Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn.

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

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Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease.

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

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Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease.

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

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Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease.

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

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Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
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