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LOANS RECEIVABLE - Credit-Rating Classification of Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023
Total loans
Originated current fiscal year	$ 270,147		$ 270,147		$ 951,989
Originated fiscal year before current fiscal year	949,778		949,778		1,697,890
Originated two years before current fiscal year	1,672,914		1,672,914		967,598
Originated three years before current fiscal year	897,081		897,081		353,683
Originated four years before current fiscal year	346,411		346,411		357,180
Originated more than five years before current fiscal year	1,551,456		1,551,456		1,429,252
Revolving loans	87,303		87,303		92,884
Financing receivable, before allowance for credit loss, fee and loan in process	5,775,090		5,775,090		5,850,476
Total current period gross charge-offs
Originated current fiscal year, writeoff			0
Originated fiscal year before current fiscal year, writeoff			0
Originated two years before current fiscal year, writeoff			0
Originated three years before current fiscal year, writeoff			5
Originated four years before current fiscal year, writeoff			336
Originated more than five years before current fiscal year, writeoff			6,412
Revolving loans, writeoff			0
Total	293	$ 215	6,753	$ 758
Commercial
Total loans
Financing receivable, before allowance for credit loss, fee and loan in process	3,987,517		3,987,517		4,103,819
Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	16,520		16,520		603,260
Originated fiscal year before current fiscal year	598,167		598,167		954,554
Originated two years before current fiscal year	953,096		953,096		223,291
Originated three years before current fiscal year	227,027		227,027		198,969
Originated four years before current fiscal year	201,040		201,040		242,367
Originated more than five years before current fiscal year	649,345		649,345		539,334
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	2,645,195		2,645,195		2,761,775
Total current period gross charge-offs
Originated current fiscal year, writeoff			0
Originated fiscal year before current fiscal year, writeoff			0
Originated two years before current fiscal year, writeoff			0
Originated three years before current fiscal year, writeoff			0
Originated four years before current fiscal year, writeoff			0
Originated more than five years before current fiscal year, writeoff			389
Revolving loans, writeoff			0
Total	35	4	389	399
Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	64,851		64,851		109,725
Originated fiscal year before current fiscal year	106,424		106,424		220,443
Originated two years before current fiscal year	205,793		205,793		83,740
Originated three years before current fiscal year	91,093		91,093		51,933
Originated four years before current fiscal year	50,767		50,767		60,116
Originated more than five years before current fiscal year	446,461		446,461		436,617
Revolving loans	150		150		6,000
Financing receivable, before allowance for credit loss, fee and loan in process	965,539		965,539		968,574
Total current period gross charge-offs
Originated current fiscal year, writeoff			0
Originated fiscal year before current fiscal year, writeoff			0
Originated two years before current fiscal year, writeoff			0
Originated three years before current fiscal year, writeoff			0
Originated four years before current fiscal year, writeoff			0
Originated more than five years before current fiscal year, writeoff			5,975
Revolving loans, writeoff			0
Total	253	6	5,975	21
Commercial | Commercial business
Total loans
Originated current fiscal year	10,216		10,216		10,364
Originated fiscal year before current fiscal year	8,906		8,906		28,644
Originated two years before current fiscal year	28,502		28,502		25,304
Originated three years before current fiscal year	22,833		22,833		8,317
Originated four years before current fiscal year	6,580		6,580		1,967
Originated more than five years before current fiscal year	12,294		12,294		12,617
Revolving loans	57,995		57,995		59,648
Financing receivable, before allowance for credit loss, fee and loan in process	147,326		147,326		146,861
Total current period gross charge-offs
Originated current fiscal year, writeoff			0
Originated fiscal year before current fiscal year, writeoff			0
Originated two years before current fiscal year, writeoff			0
Originated three years before current fiscal year, writeoff			5
Originated four years before current fiscal year, writeoff			336
Originated more than five years before current fiscal year, writeoff			11
Revolving loans, writeoff			0
Total	5	205	352	338
Commercial | Construction
Total loans
Originated current fiscal year	36,988		36,988		25,070
Originated fiscal year before current fiscal year	43,602		43,602		36,389
Originated two years before current fiscal year	43,182		43,182		143,086
Originated three years before current fiscal year	87,847		87,847		12,275
Originated four years before current fiscal year	8,352		8,352		2,961
Originated more than five years before current fiscal year	3,751		3,751		1,093
Revolving loans	5,735		5,735		5,735
Financing receivable, before allowance for credit loss, fee and loan in process	229,457		229,457		226,609
Total current period gross charge-offs
Total	0	0	0	0
Residential
Total loans
Originated current fiscal year	139,316		139,316		195,521
Originated fiscal year before current fiscal year	186,366		186,366		455,046
Originated two years before current fiscal year	439,828		439,828		491,460
Originated three years before current fiscal year	467,793		467,793		80,431
Originated four years before current fiscal year	78,137		78,137		46,989
Originated more than five years before current fiscal year	429,937		429,937		431,112
Revolving loans	267		267		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,741,644		1,741,644		1,700,559
Total current period gross charge-offs
Originated current fiscal year, writeoff			0
Originated fiscal year before current fiscal year, writeoff			0
Originated two years before current fiscal year, writeoff			0
Originated three years before current fiscal year, writeoff			0
Originated four years before current fiscal year, writeoff			0
Originated more than five years before current fiscal year, writeoff			37
Revolving loans, writeoff			0
Total	0	0	37	0
Consumer
Total loans
Financing receivable, before allowance for credit loss, fee and loan in process	45,929		45,929		46,098
Consumer | Home equity loans
Total loans
Originated current fiscal year	1,239		1,239		7,682
Originated fiscal year before current fiscal year	6,082		6,082		2,567
Originated two years before current fiscal year	2,300		2,300		607
Originated three years before current fiscal year	359		359		1,264
Originated four years before current fiscal year	1,069		1,069		2,478
Originated more than five years before current fiscal year	8,653		8,653		7,567
Revolving loans	23,029		23,029		21,384
Financing receivable, before allowance for credit loss, fee and loan in process	42,731		42,731		43,549
Total current period gross charge-offs
Total	0	0	0	0
Consumer | Other consumer
Total loans
Originated current fiscal year	1,017		1,017		367
Originated fiscal year before current fiscal year	231		231		247
Originated two years before current fiscal year	213		213		110
Originated three years before current fiscal year	129		129		494
Originated four years before current fiscal year	466		466		302
Originated more than five years before current fiscal year	1,015		1,015		912
Revolving loans	127		127		117
Financing receivable, before allowance for credit loss, fee and loan in process	3,198		3,198		2,549
Total current period gross charge-offs
Total	0	$ 0	0	$ 0
Pass | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	16,520		16,520		603,260
Originated fiscal year before current fiscal year	598,167		598,167		954,554
Originated two years before current fiscal year	953,096		953,096		213,482
Originated three years before current fiscal year	217,401		217,401		198,969
Originated four years before current fiscal year	201,040		201,040		226,929
Originated more than five years before current fiscal year	611,894		611,894		510,485
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	2,598,118		2,598,118		2,707,679
Pass | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	64,851		64,851		109,725
Originated fiscal year before current fiscal year	106,424		106,424		220,443
Originated two years before current fiscal year	205,793		205,793		83,032
Originated three years before current fiscal year	90,222		90,222		51,933
Originated four years before current fiscal year	50,767		50,767		59,197
Originated more than five years before current fiscal year	420,499		420,499		414,742
Revolving loans	150		150		6,000
Financing receivable, before allowance for credit loss, fee and loan in process	938,706		938,706		945,072
Pass | Commercial | Commercial business
Total loans
Originated current fiscal year	10,216		10,216		10,364
Originated fiscal year before current fiscal year	8,906		8,906		28,644
Originated two years before current fiscal year	26,884		26,884		25,304
Originated three years before current fiscal year	18,963		18,963		7,875
Originated four years before current fiscal year	6,401		6,401		1,731
Originated more than five years before current fiscal year	8,470		8,470		8,776
Revolving loans	57,867		57,867		59,031
Financing receivable, before allowance for credit loss, fee and loan in process	137,707		137,707		141,725
Pass | Commercial | Construction
Total loans
Originated current fiscal year	36,988		36,988		25,070
Originated fiscal year before current fiscal year	43,602		43,602		36,389
Originated two years before current fiscal year	43,182		43,182		143,086
Originated three years before current fiscal year	67,408		67,408		12,275
Originated four years before current fiscal year	8,352		8,352		2,961
Originated more than five years before current fiscal year	3,751		3,751		1,093
Revolving loans	5,735		5,735		5,735
Financing receivable, before allowance for credit loss, fee and loan in process	209,018		209,018		226,609
Pass | Residential
Total loans
Originated current fiscal year	139,316		139,316		195,521
Originated fiscal year before current fiscal year	185,852		185,852		454,504
Originated two years before current fiscal year	439,300		439,300		491,460
Originated three years before current fiscal year	467,793		467,793		80,431
Originated four years before current fiscal year	78,137		78,137		45,741
Originated more than five years before current fiscal year	419,604		419,604		422,472
Revolving loans	267		267		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,730,269		1,730,269		1,690,129
Pass | Consumer | Home equity loans
Total loans
Originated current fiscal year	1,239		1,239		7,682
Originated fiscal year before current fiscal year	6,082		6,082		2,567
Originated two years before current fiscal year	2,300		2,300		607
Originated three years before current fiscal year	359		359		1,264
Originated four years before current fiscal year	1,069		1,069		2,478
Originated more than five years before current fiscal year	8,406		8,406		7,280
Revolving loans	22,934		22,934		21,384
Financing receivable, before allowance for credit loss, fee and loan in process	42,389		42,389		43,262
Pass | Consumer | Other consumer
Total loans
Originated current fiscal year	1,017		1,017		367
Originated fiscal year before current fiscal year	231		231		247
Originated two years before current fiscal year	213		213		110
Originated three years before current fiscal year	129		129		494
Originated four years before current fiscal year	466		466		302
Originated more than five years before current fiscal year	1,015		1,015		912
Revolving loans	40		40		42
Financing receivable, before allowance for credit loss, fee and loan in process	3,111		3,111		2,474
Special Mention | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		6,006
Originated more than five years before current fiscal year	6,519		6,519		6,647
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	6,519		6,519		12,653
Special Mention | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	11,217		11,217		378
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	11,217		11,217		378
Special Mention | Commercial | Commercial business
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	1,618		1,618		0
Originated three years before current fiscal year	464		464		47
Originated four years before current fiscal year	0		0		176
Originated more than five years before current fiscal year	1,775		1,775		2,456
Revolving loans	0		0		371
Financing receivable, before allowance for credit loss, fee and loan in process	3,857		3,857		3,050
Special Mention | Commercial | Construction
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	20,439		20,439		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	20,439		20,439		0
Special Mention | Residential
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	514		514		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		1,168
Originated more than five years before current fiscal year	1,656		1,656		425
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	2,170		2,170		1,593
Special Mention | Consumer | Home equity loans
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	95		95		0
Financing receivable, before allowance for credit loss, fee and loan in process	95		95		0
Special Mention | Consumer | Other consumer
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Substandard | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		9,809
Originated three years before current fiscal year	9,626		9,626		0
Originated four years before current fiscal year	0		0		9,432
Originated more than five years before current fiscal year	30,932		30,932		22,202
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	40,558		40,558		41,443
Substandard | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		708
Originated three years before current fiscal year	871		871		0
Originated four years before current fiscal year	0		0		919
Originated more than five years before current fiscal year	14,745		14,745		21,497
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	15,616		15,616		23,124
Substandard | Commercial | Commercial business
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	3,406		3,406		395
Originated four years before current fiscal year	179		179		60
Originated more than five years before current fiscal year	2,049		2,049		1,385
Revolving loans	128		128		246
Financing receivable, before allowance for credit loss, fee and loan in process	5,762		5,762		2,086
Substandard | Commercial | Construction
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Substandard | Residential
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		542
Originated two years before current fiscal year	528		528		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		80
Originated more than five years before current fiscal year	8,677		8,677		8,215
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	9,205		9,205		8,837
Substandard | Consumer | Home equity loans
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	247		247		287
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	247		247		287
Substandard | Consumer | Other consumer
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	1		1		0
Financing receivable, before allowance for credit loss, fee and loan in process	1		1		0
Doubtful | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Doubtful | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Doubtful | Commercial | Commercial business
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Doubtful | Commercial | Construction
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Doubtful | Residential
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Doubtful | Consumer | Home equity loans
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0		0
Doubtful | Consumer | Other consumer
Total loans
Originated current fiscal year	0		0		0
Originated fiscal year before current fiscal year	0		0		0
Originated two years before current fiscal year	0		0		0
Originated three years before current fiscal year	0		0		0
Originated four years before current fiscal year	0		0		0
Originated more than five years before current fiscal year	0		0		0
Revolving loans	86		86		75
Financing receivable, before allowance for credit loss, fee and loan in process	$ 86		$ 86		$ 75

X

- 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

+ Details

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

X

- 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
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