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LOANS RECEIVABLE - Credit-Rating Classification of Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Total loans
Originated current fiscal year	$ 152,390		$ 152,390		$ 951,989
Originated fiscal year before current fiscal year	951,889		951,889		1,697,890
Originated two years before current fiscal year	1,679,210		1,679,210		967,598
Originated three years before current fiscal year	933,878		933,878		353,683
Originated four years before current fiscal year	348,712		348,712		357,180
Originated more than five years before current fiscal year	1,602,497		1,602,497		1,429,252
Revolving loans	88,362		88,362		92,884
Financing receivable, before allowance for credit loss, fee and loan in process	5,756,938		5,756,938		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			0
Originated four years before current fiscal year, writeoff			336
Originated more than five years before current fiscal year, writeoff			6,124
Revolving loans, writeoff			0
Total	4,238	$ 415	6,460	$ 543
Commercial
Total loans
Financing receivable, before allowance for credit loss, fee and loan in process	3,964,628		3,964,628		4,103,819
Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0		603,260
Originated fiscal year before current fiscal year	600,028		600,028		954,554
Originated two years before current fiscal year	955,665		955,665		223,291
Originated three years before current fiscal year	228,261		228,261		198,969
Originated four years before current fiscal year	202,206		202,206		242,367
Originated more than five years before current fiscal year	665,114		665,114		539,334
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	2,651,274		2,651,274		2,761,775
Total current period gross charge-offs
Originated more than five years before current fiscal year, writeoff			354
Total	354	395	354	395
Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	23,888		23,888		109,725
Originated fiscal year before current fiscal year	107,076		107,076		220,443
Originated two years before current fiscal year	207,213		207,213		83,740
Originated three years before current fiscal year	91,777		91,777		51,933
Originated four years before current fiscal year	51,173		51,173		60,116
Originated more than five years before current fiscal year	466,060		466,060		436,617
Revolving loans	100		100		6,000
Financing receivable, before allowance for credit loss, fee and loan in process	947,287		947,287		968,574
Total current period gross charge-offs
Originated more than five years before current fiscal year, writeoff			5,722
Total	3,689	5	5,722	15
Commercial | Commercial business
Total loans
Originated current fiscal year	4,323		4,323		10,364
Originated fiscal year before current fiscal year	9,548		9,548		28,644
Originated two years before current fiscal year	28,136		28,136		25,304
Originated three years before current fiscal year	23,793		23,793		8,317
Originated four years before current fiscal year	7,014		7,014		1,967
Originated more than five years before current fiscal year	12,517		12,517		12,617
Revolving loans	58,803		58,803		59,648
Financing receivable, before allowance for credit loss, fee and loan in process	144,134		144,134		146,861
Total current period gross charge-offs
Originated four years before current fiscal year, writeoff			336
Originated more than five years before current fiscal year, writeoff			11
Total	158	15	347	133
Commercial | Construction
Total loans
Originated current fiscal year	7,768		7,768		25,070
Originated fiscal year before current fiscal year	39,693		39,693		36,389
Originated two years before current fiscal year	41,296		41,296		143,086
Originated three years before current fiscal year	115,593		115,593		12,275
Originated four years before current fiscal year	7,995		7,995		2,961
Originated more than five years before current fiscal year	3,853		3,853		1,093
Revolving loans	5,735		5,735		5,735
Financing receivable, before allowance for credit loss, fee and loan in process	221,933		221,933		226,609
Total current period gross charge-offs
Total	0	0	0	0
Residential
Total loans
Originated current fiscal year	115,046		115,046		195,521
Originated fiscal year before current fiscal year	189,082		189,082		455,046
Originated two years before current fiscal year	444,303		444,303		491,460
Originated three years before current fiscal year	473,953		473,953		80,431
Originated four years before current fiscal year	78,719		78,719		46,989
Originated more than five years before current fiscal year	444,962		444,962		431,112
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,746,065		1,746,065		1,700,559
Total current period gross charge-offs
Originated more than five years before current fiscal year, writeoff			37
Total	37	0	37	0
Consumer
Total loans
Financing receivable, before allowance for credit loss, fee and loan in process	46,245		46,245		46,098
Consumer | Home equity loans
Total loans
Originated current fiscal year	907		907		7,682
Originated fiscal year before current fiscal year	6,226		6,226		2,567
Originated two years before current fiscal year	2,369		2,369		607
Originated three years before current fiscal year	389		389		1,264
Originated four years before current fiscal year	1,119		1,119		2,478
Originated more than five years before current fiscal year	8,906		8,906		7,567
Revolving loans	23,601		23,601		21,384
Financing receivable, before allowance for credit loss, fee and loan in process	43,517		43,517		43,549
Total current period gross charge-offs
Total	0	0	0	0
Consumer | Other consumer
Total loans
Originated current fiscal year	458		458		367
Originated fiscal year before current fiscal year	236		236		247
Originated two years before current fiscal year	228		228		110
Originated three years before current fiscal year	112		112		494
Originated four years before current fiscal year	486		486		302
Originated more than five years before current fiscal year	1,085		1,085		912
Revolving loans	123		123		117
Financing receivable, before allowance for credit loss, fee and loan in process	2,728		2,728		2,549
Total current period gross charge-offs
Total	0	$ 0	0	$ 0
Pass | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0		603,260
Originated fiscal year before current fiscal year	600,028		600,028		954,554
Originated two years before current fiscal year	955,665		955,665		213,482
Originated three years before current fiscal year	218,580		218,580		198,969
Originated four years before current fiscal year	202,206		202,206		226,929
Originated more than five years before current fiscal year	627,429		627,429		510,485
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	2,603,908		2,603,908		2,707,679
Pass | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	23,888		23,888		109,725
Originated fiscal year before current fiscal year	107,076		107,076		220,443
Originated two years before current fiscal year	207,213		207,213		83,032
Originated three years before current fiscal year	90,901		90,901		51,933
Originated four years before current fiscal year	51,173		51,173		59,197
Originated more than five years before current fiscal year	439,953		439,953		414,742
Revolving loans	100		100		6,000
Financing receivable, before allowance for credit loss, fee and loan in process	920,304		920,304		945,072
Pass | Commercial | Commercial business
Total loans
Originated current fiscal year	4,323		4,323		10,364
Originated fiscal year before current fiscal year	9,548		9,548		28,644
Originated two years before current fiscal year	26,708		26,708		25,304
Originated three years before current fiscal year	20,230		20,230		7,875
Originated four years before current fiscal year	6,832		6,832		1,731
Originated more than five years before current fiscal year	8,748		8,748		8,776
Revolving loans	58,601		58,601		59,031
Financing receivable, before allowance for credit loss, fee and loan in process	134,990		134,990		141,725
Pass | Commercial | Construction
Total loans
Originated current fiscal year	7,768		7,768		25,070
Originated fiscal year before current fiscal year	39,693		39,693		36,389
Originated two years before current fiscal year	41,296		41,296		143,086
Originated three years before current fiscal year	115,593		115,593		12,275
Originated four years before current fiscal year	7,995		7,995		2,961
Originated more than five years before current fiscal year	3,853		3,853		1,093
Revolving loans	5,735		5,735		5,735
Financing receivable, before allowance for credit loss, fee and loan in process	221,933		221,933		226,609
Pass | Residential
Total loans
Originated current fiscal year	115,046		115,046		195,521
Originated fiscal year before current fiscal year	189,082		189,082		454,504
Originated two years before current fiscal year	443,771		443,771		491,460
Originated three years before current fiscal year	473,953		473,953		80,431
Originated four years before current fiscal year	78,719		78,719		45,741
Originated more than five years before current fiscal year	434,754		434,754		422,472
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,735,325		1,735,325		1,690,129
Pass | Consumer | Home equity loans
Total loans
Originated current fiscal year	907		907		7,682
Originated fiscal year before current fiscal year	6,226		6,226		2,567
Originated two years before current fiscal year	2,369		2,369		607
Originated three years before current fiscal year	389		389		1,264
Originated four years before current fiscal year	1,119		1,119		2,478
Originated more than five years before current fiscal year	8,645		8,645		7,280
Revolving loans	23,502		23,502		21,384
Financing receivable, before allowance for credit loss, fee and loan in process	43,157		43,157		43,262
Pass | Consumer | Other consumer
Total loans
Originated current fiscal year	458		458		367
Originated fiscal year before current fiscal year	236		236		247
Originated two years before current fiscal year	228		228		110
Originated three years before current fiscal year	112		112		494
Originated four years before current fiscal year	486		486		302
Originated more than five years before current fiscal year	1,085		1,085		912
Revolving loans	40		40		42
Financing receivable, before allowance for credit loss, fee and loan in process	2,645		2,645		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	6,562		6,562		6,647
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	6,562		6,562		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	11,271		11,271		378
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	11,271		11,271		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	1,428		1,428		0
Originated three years before current fiscal year	0		0		47
Originated four years before current fiscal year	0		0		176
Originated more than five years before current fiscal year	1,798		1,798		2,456
Revolving loans	0		0		371
Financing receivable, before allowance for credit loss, fee and loan in process	3,226		3,226		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	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
Special Mention | 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		1,168
Originated more than five years before current fiscal year	1,822		1,822		425
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,822		1,822		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	99		99		0
Financing receivable, before allowance for credit loss, fee and loan in process	99		99		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	9,681		9,681		0
Originated four years before current fiscal year	0		0		9,432
Originated more than five years before current fiscal year	31,123		31,123		22,202
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	40,804		40,804		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	876		876		0
Originated four years before current fiscal year	0		0		919
Originated more than five years before current fiscal year	14,836		14,836		21,497
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	15,712		15,712		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	3,563		3,563		395
Originated four years before current fiscal year	182		182		60
Originated more than five years before current fiscal year	1,971		1,971		1,385
Revolving loans	202		202		246
Financing receivable, before allowance for credit loss, fee and loan in process	5,918		5,918		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	532		532		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	8,386		8,386		8,215
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	8,918		8,918		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	261		261		287
Revolving loans	0		0		0
Financing receivable, before allowance for credit loss, fee and loan in process	261		261		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	82		82		75
Financing receivable, before allowance for credit loss, fee and loan in process	$ 82		$ 82		$ 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

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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
-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
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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- References

No definition available.

+ Details

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- References

No definition available.

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