LOANS RECEIVABLE - Credit-Rating Classification of Loans Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Jun. 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	$ 914,974	$ 1,734,134
Originated fiscal year before current fiscal year	1,712,595	997,932
Originated two years before current fiscal year	992,113	378,754
Originated three years before current fiscal year	359,257	396,664
Originated four years before current fiscal year	377,463	379,618
Originated more than five years before current fiscal year	1,519,352	1,455,925
Revolving Loans	100,614	93,549
Financing receivable, before allowance for credit loss, fee and loan in process	5,976,368	5,436,576
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	4,216,057	3,745,866
Commercial Portfolio Segment | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	604,750	963,263
Originated fiscal year before current fiscal year	955,969	250,385
Originated two years before current fiscal year	244,596	211,101
Originated three years before current fiscal year	201,324	273,995
Originated four years before current fiscal year	261,083	253,993
Originated more than five years before current fiscal year	568,130	456,353
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	2,835,852	2,409,090
Commercial Portfolio Segment | Nonresidential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	100,886	231,777
Originated fiscal year before current fiscal year	226,384	88,029
Originated two years before current fiscal year	84,341	53,983
Originated three years before current fiscal year	52,276	61,647
Originated four years before current fiscal year	60,507	53,311
Originated more than five years before current fiscal year	472,249	525,039
Revolving Loans	6,000	6,052
Financing receivable, before allowance for credit loss, fee and loan in process	1,002,643	1,019,838
Commercial Portfolio Segment | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	13,025	46,888
Originated fiscal year before current fiscal year	34,790	38,829
Originated two years before current fiscal year	23,154	12,536
Originated three years before current fiscal year	9,117	3,767
Originated four years before current fiscal year	2,055	8,381
Originated more than five years before current fiscal year	12,558	7,469
Revolving Loans	67,339	58,937
Financing receivable, before allowance for credit loss, fee and loan in process	162,038	176,807
Commercial Portfolio Segment | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	17,507	16,407
Originated fiscal year before current fiscal year	32,334	95,526
Originated two years before current fiscal year	137,660	10,337
Originated three years before current fiscal year	12,275	3,039
Originated four years before current fiscal year	2,980	6,509
Originated more than five years before current fiscal year	7,033	2,578
Revolving Loans	5,735	5,735
Financing receivable, before allowance for credit loss, fee and loan in process	215,524	140,131
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	170,816	472,160
Originated fiscal year before current fiscal year	460,229	524,163
Originated two years before current fiscal year	501,615	88,645
Originated three years before current fiscal year	82,492	50,604
Originated four years before current fiscal year	47,845	55,139
Originated more than five years before current fiscal year	450,346	454,731
Revolving Loans	0	374
Financing receivable, before allowance for credit loss, fee and loan in process	1,713,343	1,645,816
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	46,968	44,894
Consumer Loans | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	7,652	3,197
Originated fiscal year before current fiscal year	2,627	692
Originated two years before current fiscal year	622	1,681
Originated three years before current fiscal year	1,321	3,237
Originated four years before current fiscal year	2,668	2,027
Originated more than five years before current fiscal year	8,067	8,860
Revolving Loans	21,419	22,334
Financing receivable, before allowance for credit loss, fee and loan in process	44,376	42,028
Consumer Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	338	442
Originated fiscal year before current fiscal year	262	308
Originated two years before current fiscal year	125	471
Originated three years before current fiscal year	452	375
Originated four years before current fiscal year	325	258
Originated more than five years before current fiscal year	969	895
Revolving Loans	121	117
Financing receivable, before allowance for credit loss, fee and loan in process	2,592	2,866
Pass | Commercial Portfolio Segment | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	604,750	963,263
Originated fiscal year before current fiscal year	955,969	250,385
Originated two years before current fiscal year	234,731	211,101
Originated three years before current fiscal year	201,324	264,174
Originated four years before current fiscal year	245,571	248,058
Originated more than five years before current fiscal year	538,279	438,642
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	2,780,624	2,375,623
Pass | Commercial Portfolio Segment | Nonresidential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	100,886	231,777
Originated fiscal year before current fiscal year	226,384	87,309
Originated two years before current fiscal year	83,630	53,983
Originated three years before current fiscal year	52,276	60,714
Originated four years before current fiscal year	59,582	49,285
Originated more than five years before current fiscal year	449,241	491,849
Revolving Loans	6,000	6,052
Financing receivable, before allowance for credit loss, fee and loan in process	977,999	980,969
Pass | Commercial Portfolio Segment | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	13,025	46,888
Originated fiscal year before current fiscal year	29,649	38,791
Originated two years before current fiscal year	23,154	12,155
Originated three years before current fiscal year	8,852	3,581
Originated four years before current fiscal year	1,831	4,861
Originated more than five years before current fiscal year	8,342	6,455
Revolving Loans	67,093	58,662
Financing receivable, before allowance for credit loss, fee and loan in process	151,946	171,393
Pass | Commercial Portfolio Segment | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	17,507	16,407
Originated fiscal year before current fiscal year	32,334	95,526
Originated two years before current fiscal year	137,660	10,337
Originated three years before current fiscal year	12,275	3,039
Originated four years before current fiscal year	2,980	6,509
Originated more than five years before current fiscal year	7,033	1,017
Revolving Loans	5,735	5,735
Financing receivable, before allowance for credit loss, fee and loan in process	215,524	138,570
Pass | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	170,816	472,160
Originated fiscal year before current fiscal year	459,680	524,163
Originated two years before current fiscal year	501,615	88,645
Originated three years before current fiscal year	82,492	49,316
Originated four years before current fiscal year	46,589	55,139
Originated more than five years before current fiscal year	439,128	442,517
Revolving Loans	0	374
Financing receivable, before allowance for credit loss, fee and loan in process	1,700,320	1,632,314
Pass | Consumer Loans | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	7,652	3,197
Originated fiscal year before current fiscal year	2,627	692
Originated two years before current fiscal year	622	1,681
Originated three years before current fiscal year	1,321	3,117
Originated four years before current fiscal year	2,575	2,027
Originated more than five years before current fiscal year	7,763	7,321
Revolving Loans	21,419	22,334
Financing receivable, before allowance for credit loss, fee and loan in process	43,979	40,369
Pass | Consumer Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	338	442
Originated fiscal year before current fiscal year	262	308
Originated two years before current fiscal year	125	471
Originated three years before current fiscal year	452	375
Originated four years before current fiscal year	325	258
Originated more than five years before current fiscal year	969	895
Revolving Loans	44	34
Financing receivable, before allowance for credit loss, fee and loan in process	2,515	2,783
Special Mention | Commercial Portfolio Segment | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	6,043	0
Originated more than five years before current fiscal year	6,689	6,814
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	12,732	6,814
Special Mention | Commercial Portfolio Segment | Nonresidential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	381	591
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	381	591
Special Mention | Commercial Portfolio Segment | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	0	0
Originated fiscal year before current fiscal year	5,141	0
Originated two years before current fiscal year	0	62
Originated three years before current fiscal year	0	186
Originated four years before current fiscal year	178	2,173
Originated more than five years before current fiscal year	2,834	873
Revolving Loans	0	215
Financing receivable, before allowance for credit loss, fee and loan in process	8,153	3,509
Special Mention | Commercial Portfolio Segment | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
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
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	1,205
Originated four years before current fiscal year	1,176	0
Originated more than five years before current fiscal year	1,053	621
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	2,229	1,826
Special Mention | Consumer Loans | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
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 Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
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 Portfolio Segment | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	0	0
Originated fiscal year before current fiscal year	0	0
Originated two years before current fiscal year	9,865	0
Originated three years before current fiscal year	0	9,821
Originated four years before current fiscal year	9,469	5,935
Originated more than five years before current fiscal year	23,162	10,897
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	42,496	26,653
Substandard | Commercial Portfolio Segment | Nonresidential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	0	0
Originated fiscal year before current fiscal year	0	720
Originated two years before current fiscal year	711	0
Originated three years before current fiscal year	0	933
Originated four years before current fiscal year	925	4,026
Originated more than five years before current fiscal year	22,627	32,599
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	24,263	38,278
Substandard | Commercial Portfolio Segment | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	0	0
Originated fiscal year before current fiscal year	0	38
Originated two years before current fiscal year	0	319
Originated three years before current fiscal year	265	0
Originated four years before current fiscal year	46	1,347
Originated more than five years before current fiscal year	1,382	61
Revolving Loans	246	58
Financing receivable, before allowance for credit loss, fee and loan in process	1,939	1,823
Substandard | Commercial Portfolio Segment | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	1,561
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	0	1,561
Substandard | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	0	0
Originated fiscal year before current fiscal year	549	0
Originated two years before current fiscal year	0	0
Originated three years before current fiscal year	0	83
Originated four years before current fiscal year	80	0
Originated more than five years before current fiscal year	10,165	11,593
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	10,794	11,676
Substandard | Consumer Loans | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	120
Originated four years before current fiscal year	93	0
Originated more than five years before current fiscal year	304	1,539
Revolving Loans	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	397	1,659
Substandard | Consumer Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
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 Portfolio Segment | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
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 Portfolio Segment | Nonresidential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
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 Portfolio Segment | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	80
Revolving Loans	0	2
Financing receivable, before allowance for credit loss, fee and loan in process	0	82
Doubtful | Commercial Portfolio Segment | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
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
Financing Receivable, Recorded Investment, Past Due [Line Items]
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 Loans | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
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 Loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
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	77	83
Financing receivable, before allowance for credit loss, fee and loan in process	$ 77	$ 83