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LOANS RECEIVABLE - Credit-Rating Classification of Loans Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023
Total loans
Originated current fiscal year	$ 36,651		$ 951,989
Originated fiscal year before current fiscal year	955,489		1,697,890
Originated two years before current fiscal year	1,684,226		967,598
Originated three years before current fiscal year	948,855		353,683
Originated four years before current fiscal year	350,994		357,180
Originated more than five years before current fiscal year	1,688,992		1,429,252
Revolving loans	95,268		92,884
Financing receivable, before allowance for credit loss, fee and loan in process	5,760,475		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	178
Originated more than five years before current fiscal year, writeoff	2,044
Revolving loans, writeoff	0
Total	2,222	$ 128
Commercial
Total loans
Financing receivable, before allowance for credit loss, fee and loan in process	4,025,884		4,103,819
Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		603,260
Originated fiscal year before current fiscal year	601,736		954,554
Originated two years before current fiscal year	952,821		223,291
Originated three years before current fiscal year	223,302		198,969
Originated four years before current fiscal year	203,358		242,367
Originated more than five years before current fiscal year	717,934		539,334
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	2,699,151		2,761,775
Total current period gross charge-offs
Total	0	0
Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	2,779		109,725
Originated fiscal year before current fiscal year	107,718		220,443
Originated two years before current fiscal year	208,575		83,740
Originated three years before current fiscal year	88,075		51,933
Originated four years before current fiscal year	51,571		60,116
Originated more than five years before current fiscal year	482,083		436,617
Revolving loans	6,000		6,000
Financing receivable, before allowance for credit loss, fee and loan in process	946,801		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	2,033
Revolving loans, writeoff	0
Total	2,033	10
Commercial | Commercial business
Total loans
Originated current fiscal year	1,733		10,364
Originated fiscal year before current fiscal year	11,427		28,644
Originated two years before current fiscal year	28,320		25,304
Originated three years before current fiscal year	24,577		8,317
Originated four years before current fiscal year	7,658		1,967
Originated more than five years before current fiscal year	13,847		12,617
Revolving loans	61,667		59,648
Financing receivable, before allowance for credit loss, fee and loan in process	149,229		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	0
Originated four years before current fiscal year, writeoff	178
Originated more than five years before current fiscal year, writeoff	11
Revolving loans, writeoff	0
Total	189	118
Commercial | Construction
Total loans
Originated current fiscal year	7,184		25,070
Originated fiscal year before current fiscal year	34,204		36,389
Originated two years before current fiscal year	41,698		143,086
Originated three years before current fiscal year	130,476		12,275
Originated four years before current fiscal year	7,453		2,961
Originated more than five years before current fiscal year	3,953		1,093
Revolving loans	5,735		5,735
Financing receivable, before allowance for credit loss, fee and loan in process	230,703		226,609
Total current period gross charge-offs
Total	0	0
Residential
Total loans
Originated current fiscal year	24,092		195,521
Originated fiscal year before current fiscal year	193,179		455,046
Originated two years before current fiscal year	450,059		491,460
Originated three years before current fiscal year	481,718		80,431
Originated four years before current fiscal year	79,290		46,989
Originated more than five years before current fiscal year	460,713		431,112
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,689,051		1,700,559
Total current period gross charge-offs
Total	0	0
Consumer
Total loans
Financing receivable, before allowance for credit loss, fee and loan in process	45,540		46,098
Consumer | Home equity loans
Total loans
Originated current fiscal year	567		7,682
Originated fiscal year before current fiscal year	6,965		2,567
Originated two years before current fiscal year	2,517		607
Originated three years before current fiscal year	591		1,264
Originated four years before current fiscal year	1,173		2,478
Originated more than five years before current fiscal year	9,339		7,567
Revolving loans	21,744		21,384
Financing receivable, before allowance for credit loss, fee and loan in process	42,896		43,549
Total current period gross charge-offs
Total	0	0
Consumer | Other consumer
Total loans
Originated current fiscal year	296		367
Originated fiscal year before current fiscal year	260		247
Originated two years before current fiscal year	236		110
Originated three years before current fiscal year	116		494
Originated four years before current fiscal year	491		302
Originated more than five years before current fiscal year	1,123		912
Revolving loans	122		117
Financing receivable, before allowance for credit loss, fee and loan in process	2,644		2,549
Total current period gross charge-offs
Total	0	$ 0
Pass | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		603,260
Originated fiscal year before current fiscal year	601,736		954,554
Originated two years before current fiscal year	952,821		213,482
Originated three years before current fiscal year	213,565		198,969
Originated four years before current fiscal year	203,358		226,929
Originated more than five years before current fiscal year	677,086		510,485
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	2,648,566		2,707,679
Pass | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	2,779		109,725
Originated fiscal year before current fiscal year	107,718		220,443
Originated two years before current fiscal year	208,575		83,032
Originated three years before current fiscal year	87,371		51,933
Originated four years before current fiscal year	51,571		59,197
Originated more than five years before current fiscal year	450,806		414,742
Revolving loans	6,000		6,000
Financing receivable, before allowance for credit loss, fee and loan in process	914,820		945,072
Pass | Commercial | Commercial business
Total loans
Originated current fiscal year	1,733		10,364
Originated fiscal year before current fiscal year	11,427		28,644
Originated two years before current fiscal year	27,853		25,304
Originated three years before current fiscal year	24,577		7,875
Originated four years before current fiscal year	7,444		1,731
Originated more than five years before current fiscal year	10,096		8,776
Revolving loans	61,241		59,031
Financing receivable, before allowance for credit loss, fee and loan in process	144,371		141,725
Pass | Commercial | Construction
Total loans
Originated current fiscal year	7,184		25,070
Originated fiscal year before current fiscal year	34,204		36,389
Originated two years before current fiscal year	41,698		143,086
Originated three years before current fiscal year	130,476		12,275
Originated four years before current fiscal year	7,453		2,961
Originated more than five years before current fiscal year	3,953		1,093
Revolving loans	5,735		5,735
Financing receivable, before allowance for credit loss, fee and loan in process	230,703		226,609
Pass | Residential
Total loans
Originated current fiscal year	24,092		195,521
Originated fiscal year before current fiscal year	193,179		454,504
Originated two years before current fiscal year	449,520		491,460
Originated three years before current fiscal year	481,718		80,431
Originated four years before current fiscal year	79,290		45,741
Originated more than five years before current fiscal year	450,416		422,472
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,678,215		1,690,129
Pass | Consumer | Home equity loans
Total loans
Originated current fiscal year	567		7,682
Originated fiscal year before current fiscal year	6,965		2,567
Originated two years before current fiscal year	2,517		607
Originated three years before current fiscal year	591		1,264
Originated four years before current fiscal year	1,173		2,478
Originated more than five years before current fiscal year	9,065		7,280
Revolving loans	21,744		21,384
Financing receivable, before allowance for credit loss, fee and loan in process	42,622		43,262
Pass | Consumer | Other consumer
Total loans
Originated current fiscal year	296		367
Originated fiscal year before current fiscal year	260		247
Originated two years before current fiscal year	236		110
Originated three years before current fiscal year	116		494
Originated four years before current fiscal year	491		302
Originated more than five years before current fiscal year	1,123		912
Revolving loans	40		42
Financing receivable, before allowance for credit loss, fee and loan in process	2,562		2,474
Special Mention | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		6,006
Originated more than five years before current fiscal year	6,605		6,647
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	6,605		12,653
Special Mention | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	11,325		378
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	11,325		378
Special Mention | Commercial | Commercial business
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	467		0
Originated three years before current fiscal year	0		47
Originated four years before current fiscal year	0		176
Originated more than five years before current fiscal year	2,254		2,456
Revolving loans	0		371
Financing receivable, before allowance for credit loss, fee and loan in process	2,721		3,050
Special Mention | Commercial | Construction
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Special Mention | Residential
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		1,168
Originated more than five years before current fiscal year	1,581		425
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	1,581		1,593
Special Mention | Consumer | Home equity loans
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Special Mention | Consumer | Other consumer
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Substandard | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		9,809
Originated three years before current fiscal year	9,737		0
Originated four years before current fiscal year	0		9,432
Originated more than five years before current fiscal year	34,243		22,202
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	43,980		41,443
Substandard | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		708
Originated three years before current fiscal year	704		0
Originated four years before current fiscal year	0		919
Originated more than five years before current fiscal year	19,952		21,497
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	20,656		23,124
Substandard | Commercial | Commercial business
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		395
Originated four years before current fiscal year	214		60
Originated more than five years before current fiscal year	1,497		1,385
Revolving loans	426		246
Financing receivable, before allowance for credit loss, fee and loan in process	2,137		2,086
Substandard | Commercial | Construction
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Substandard | Residential
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		542
Originated two years before current fiscal year	539		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		80
Originated more than five years before current fiscal year	8,716		8,215
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	9,255		8,837
Substandard | Consumer | Home equity loans
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	274		287
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	274		287
Substandard | Consumer | Other consumer
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Doubtful | Commercial | Multi-family mortgage
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Doubtful | Commercial | Nonresidential mortgage
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Doubtful | Commercial | Commercial business
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Doubtful | Commercial | Construction
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Doubtful | Residential
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Doubtful | Consumer | Home equity loans
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	0		0
Financing receivable, before allowance for credit loss, fee and loan in process	0		0
Doubtful | Consumer | Other consumer
Total loans
Originated current fiscal year	0		0
Originated fiscal year before current fiscal year	0		0
Originated two years before current fiscal year	0		0
Originated three years before current fiscal year	0		0
Originated four years before current fiscal year	0		0
Originated more than five years before current fiscal year	0		0
Revolving loans	82		75
Financing receivable, before allowance for credit loss, fee and loan in process	$ 82		$ 75

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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.

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