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Loans Receivable - Credit-Rating Classification of Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	$ 951,989	$ 1,734,134
Originated fiscal year before current fiscal year	1,697,890	997,932
Originated two years before current fiscal year	967,598	378,754
Originated three years before current fiscal year	353,683	396,664
Originated four years before current fiscal year	357,180	379,618
Originated more than five years before current fiscal year	1,429,252	1,455,925
Revolving Loans	92,884	93,549
Total	5,850,476	5,436,576
Commercial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	4,103,819	3,745,866
Commercial loans | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	603,260	963,263
Originated fiscal year before current fiscal year	954,554	250,385
Originated two years before current fiscal year	223,291	211,101
Originated three years before current fiscal year	198,969	273,995
Originated four years before current fiscal year	242,367	253,993
Originated more than five years before current fiscal year	539,334	456,353
Revolving Loans	0	0
Total	2,761,775	2,409,090
Commercial loans | Nonresidential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	109,725	231,777
Originated fiscal year before current fiscal year	220,443	88,029
Originated two years before current fiscal year	83,740	53,983
Originated three years before current fiscal year	51,933	61,647
Originated four years before current fiscal year	60,116	53,311
Originated more than five years before current fiscal year	436,617	525,039
Revolving Loans	6,000	6,052
Total	968,574	1,019,838
Commercial loans | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	10,364	46,888
Originated fiscal year before current fiscal year	28,644	38,829
Originated two years before current fiscal year	25,304	12,536
Originated three years before current fiscal year	8,317	3,767
Originated four years before current fiscal year	1,967	8,381
Originated more than five years before current fiscal year	12,617	7,469
Revolving Loans	59,648	58,937
Total	146,861	176,807
Commercial loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	25,070	16,407
Originated fiscal year before current fiscal year	36,389	95,526
Originated two years before current fiscal year	143,086	10,337
Originated three years before current fiscal year	12,275	3,039
Originated four years before current fiscal year	2,961	6,509
Originated more than five years before current fiscal year	1,093	2,578
Revolving Loans	5,735	5,735
Total	226,609	140,131
Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	195,521	472,160
Originated fiscal year before current fiscal year	455,046	524,163
Originated two years before current fiscal year	491,460	88,645
Originated three years before current fiscal year	80,431	50,604
Originated four years before current fiscal year	46,989	55,139
Originated more than five years before current fiscal year	431,112	454,731
Revolving Loans	0	374
Total	1,700,559	1,645,816
Consumer loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	46,098	44,894
Consumer loans | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	7,682	3,197
Originated fiscal year before current fiscal year	2,567	692
Originated two years before current fiscal year	607	1,681
Originated three years before current fiscal year	1,264	3,237
Originated four years before current fiscal year	2,478	2,027
Originated more than five years before current fiscal year	7,567	8,860
Revolving Loans	21,384	22,334
Total	43,549	42,028
Consumer loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	367	442
Originated fiscal year before current fiscal year	247	308
Originated two years before current fiscal year	110	471
Originated three years before current fiscal year	494	375
Originated four years before current fiscal year	302	258
Originated more than five years before current fiscal year	912	895
Revolving Loans	117	117
Total	2,549	2,866
Pass | Commercial loans | Multi-family mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	603,260	963,263
Originated fiscal year before current fiscal year	954,554	250,385
Originated two years before current fiscal year	213,482	211,101
Originated three years before current fiscal year	198,969	264,174
Originated four years before current fiscal year	226,929	248,058
Originated more than five years before current fiscal year	510,485	438,642
Revolving Loans	0	0
Total	2,707,679	2,375,623
Pass | Commercial loans | Nonresidential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	109,725	231,777
Originated fiscal year before current fiscal year	220,443	87,309
Originated two years before current fiscal year	83,032	53,983
Originated three years before current fiscal year	51,933	60,714
Originated four years before current fiscal year	59,197	49,285
Originated more than five years before current fiscal year	414,742	491,849
Revolving Loans	6,000	6,052
Total	945,072	980,969
Pass | Commercial loans | Commercial business
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	10,364	46,888
Originated fiscal year before current fiscal year	28,644	38,791
Originated two years before current fiscal year	25,304	12,155
Originated three years before current fiscal year	7,875	3,581
Originated four years before current fiscal year	1,731	4,861
Originated more than five years before current fiscal year	8,776	6,455
Revolving Loans	59,031	58,662
Total	141,725	171,393
Pass | Commercial loans | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	25,070	16,407
Originated fiscal year before current fiscal year	36,389	95,526
Originated two years before current fiscal year	143,086	10,337
Originated three years before current fiscal year	12,275	3,039
Originated four years before current fiscal year	2,961	6,509
Originated more than five years before current fiscal year	1,093	1,017
Revolving Loans	5,735	5,735
Total	226,609	138,570
Pass | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	195,521	472,160
Originated fiscal year before current fiscal year	454,504	524,163
Originated two years before current fiscal year	491,460	88,645
Originated three years before current fiscal year	80,431	49,316
Originated four years before current fiscal year	45,741	55,139
Originated more than five years before current fiscal year	422,472	442,517
Revolving Loans	0	374
Total	1,690,129	1,632,314
Pass | Consumer loans | Home equity loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	7,682	3,197
Originated fiscal year before current fiscal year	2,567	692
Originated two years before current fiscal year	607	1,681
Originated three years before current fiscal year	1,264	3,117
Originated four years before current fiscal year	2,478	2,027
Originated more than five years before current fiscal year	7,280	7,321
Revolving Loans	21,384	22,334
Total	43,262	40,369
Pass | Consumer loans | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	367	442
Originated fiscal year before current fiscal year	247	308
Originated two years before current fiscal year	110	471
Originated three years before current fiscal year	494	375
Originated four years before current fiscal year	302	258
Originated more than five years before current fiscal year	912	895
Revolving Loans	42	34
Total	2,474	2,783
Special Mention | Commercial loans | 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	6,006	0
Originated more than five years before current fiscal year	6,647	6,814
Revolving Loans	0	0
Total	12,653	6,814
Special Mention | Commercial loans | 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	378	591
Revolving Loans	0	0
Total	378	591
Special Mention | Commercial loans | 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	62
Originated three years before current fiscal year	47	186
Originated four years before current fiscal year	176	2,173
Originated more than five years before current fiscal year	2,456	873
Revolving Loans	371	215
Total	3,050	3,509
Special Mention | Commercial loans | 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
Total	0	0
Special Mention | Residential 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	1,205
Originated four years before current fiscal year	1,168	0
Originated more than five years before current fiscal year	425	621
Revolving Loans	0	0
Total	1,593	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
Total	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
Total	0	0
Substandard | Commercial loans | 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	9,809	0
Originated three years before current fiscal year	0	9,821
Originated four years before current fiscal year	9,432	5,935
Originated more than five years before current fiscal year	22,202	10,897
Revolving Loans	0	0
Total	41,443	26,653
Substandard | Commercial loans | 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	708	0
Originated three years before current fiscal year	0	933
Originated four years before current fiscal year	919	4,026
Originated more than five years before current fiscal year	21,497	32,599
Revolving Loans	0	0
Total	23,124	38,278
Substandard | Commercial loans | 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	395	0
Originated four years before current fiscal year	60	1,347
Originated more than five years before current fiscal year	1,385	61
Revolving Loans	246	58
Total	2,086	1,823
Substandard | Commercial loans | 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
Total	0	1,561
Substandard | Residential mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Originated current fiscal year	0	0
Originated fiscal year before current fiscal year	542	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	8,215	11,593
Revolving Loans	0	0
Total	8,837	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	0	0
Originated more than five years before current fiscal year	287	1,539
Revolving Loans	0	0
Total	287	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
Total	0	0
Doubtful | Commercial loans | 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
Total	0	0
Doubtful | Commercial loans | 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
Total	0	0
Doubtful | Commercial loans | 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
Total	0	82
Doubtful | Commercial loans | 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
Total	0	0
Doubtful | Residential 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
Total	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
Total	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	75	83
Total	$ 75	$ 83

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.

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