Loans Receivable - Credit-Rating Classification of Loans Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	$ 5,436,576	$ 4,880,310
Interest Bearing Deposits In Banks	75,521	46,392
June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	5,436,576
June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		4,880,310
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	42,028	47,871
Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	42,028
Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		47,871
Non-Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,019,838	1,079,444
Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,019,838
Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,079,444
Commercial Business [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	176,807	168,951
Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	176,807
Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		168,951
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	140,131	93,804
Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	140,131
Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		93,804
Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,645,816
Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,447,721
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	2,866	3,259
Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	2,866
Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		3,259
Pass [Member] | Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	40,369
Pass [Member] | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		45,532
Pass [Member] | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	980,969
Pass [Member] | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,000,585
Pass [Member] | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	171,393
Pass [Member] | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		162,728
Pass [Member] | Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	138,570
Pass [Member] | Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		91,557
Pass [Member] | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,632,314
Pass [Member] | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,422,020
Pass [Member] | Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	2,783
Pass [Member] | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		3,171
Special Mention | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		393
Special Mention | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	591
Special Mention | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		40,980
Special Mention | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	3,509
Special Mention | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		3,722
Special Mention | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,826
Special Mention | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,945
Substandard | Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,659
Substandard | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,946
Substandard | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	38,278
Substandard | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		37,879
Substandard | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,823
Substandard | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		2,072
Substandard | Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,561
Substandard | Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		2,247
Substandard | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	11,676
Substandard | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		23,756
Substandard | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1
Doubtful | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	82
Doubtful | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		429
Doubtful | Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	83
Doubtful | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		87
Revolving Credit Facility | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	93,549
Revolving Credit Facility | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		103,307
Revolving Credit Facility | Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	22,334
Revolving Credit Facility | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		24,788
Revolving Credit Facility | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	6,052
Revolving Credit Facility | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		6,150
Revolving Credit Facility | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	58,937
Revolving Credit Facility | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		66,127
Revolving Credit Facility | Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	5,735
Revolving Credit Facility | Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		5,735
Revolving Credit Facility | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	374
Revolving Credit Facility | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		375
Revolving Credit Facility | Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	117
Revolving Credit Facility | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		132
Revolving Credit Facility | Pass [Member] | Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	22,334
Revolving Credit Facility | Pass [Member] | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		24,788
Revolving Credit Facility | Pass [Member] | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	6,052
Revolving Credit Facility | Pass [Member] | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		6,150
Revolving Credit Facility | Pass [Member] | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	58,662
Revolving Credit Facility | Pass [Member] | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		65,657
Revolving Credit Facility | Pass [Member] | Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	5,735
Revolving Credit Facility | Pass [Member] | Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		5,735
Revolving Credit Facility | Pass [Member] | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	374
Revolving Credit Facility | Pass [Member] | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		375
Revolving Credit Facility | Pass [Member] | Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	34
Revolving Credit Facility | Pass [Member] | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		44
Revolving Credit Facility | Special Mention | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	215
Revolving Credit Facility | Special Mention | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		461
Revolving Credit Facility | Substandard | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	58
Revolving Credit Facility | Substandard | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1
Revolving Credit Facility | Doubtful | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	2
Revolving Credit Facility | Doubtful | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		9
Revolving Credit Facility | Doubtful | Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	83
Revolving Credit Facility | Doubtful | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		87
Multi-Family Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	2,409,090	2,039,260
Multi-Family Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	2,409,090
Multi-Family Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		2,039,260
Multi-Family Mortgage [Member] | Pass [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	2,375,623
Multi-Family Mortgage [Member] | Pass [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,973,826
Multi-Family Mortgage [Member] | Special Mention | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	6,814
Multi-Family Mortgage [Member] | Special Mention | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		37,941
Multi-Family Mortgage [Member] | Substandard | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	26,653
Multi-Family Mortgage [Member] | Substandard | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		27,493
Term Loan Amortized Cost [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	1,734,134	997,932	$ 378,754	$ 396,664	$ 379,618	$ 1,455,925
Term Loan Amortized Cost [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		1,028,561	500,255	574,903	531,566	774,870	$ 1,366,848
Term Loan Amortized Cost [Member] | Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	3,197	692	1,681	3,237	2,027	8,860
Term Loan Amortized Cost [Member] | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		834	2,508	4,585	2,778	2,252	10,126
Term Loan Amortized Cost [Member] | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	231,777	88,029	53,983	61,647	53,311	525,039
Term Loan Amortized Cost [Member] | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		100,345	77,146	79,955	73,696	284,343	457,809
Term Loan Amortized Cost [Member] | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	46,888	38,829	12,536	3,767	8,381	7,469
Term Loan Amortized Cost [Member] | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		44,555	19,064	4,861	16,432	4,399	13,513
Term Loan Amortized Cost [Member] | Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	16,407	95,526	10,337	3,039	6,509	2,578
Term Loan Amortized Cost [Member] | Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		40,332	17,404	11,203	13,860	1,641	3,629
Term Loan Amortized Cost [Member] | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	472,160	524,163	88,645	50,604	55,139	454,731
Term Loan Amortized Cost [Member] | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		560,543	125,646	71,821	75,265	120,706	493,365
Term Loan Amortized Cost [Member] | Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	442	308	471	375	258	895
Term Loan Amortized Cost [Member] | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		550	517	633	256	127	1,044
Term Loan Amortized Cost [Member] | Pass [Member] | Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	3,197	692	1,681	3,117	2,027	7,321
Term Loan Amortized Cost [Member] | Pass [Member] | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		834	2,508	4,585	2,778	2,241	7,798
Term Loan Amortized Cost [Member] | Pass [Member] | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	231,777	87,309	53,983	60,714	49,285	491,849
Term Loan Amortized Cost [Member] | Pass [Member] | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		99,602	77,146	56,435	64,616	254,940	441,696
Term Loan Amortized Cost [Member] | Pass [Member] | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	46,888	38,791	12,155	3,581	4,861	6,455
Term Loan Amortized Cost [Member] | Pass [Member] | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		44,514	18,988	4,701	12,654	3,322	12,892
Term Loan Amortized Cost [Member] | Pass [Member] | Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	16,407	95,526	10,337	3,039	6,509	1,017
Term Loan Amortized Cost [Member] | Pass [Member] | Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		40,332	17,404	11,203	13,860	1,641	1,382
Term Loan Amortized Cost [Member] | Pass [Member] | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	472,160	524,163	88,645	49,316	55,139	442,517
Term Loan Amortized Cost [Member] | Pass [Member] | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		560,543	124,606	69,917	74,754	119,238	472,587
Term Loan Amortized Cost [Member] | Pass [Member] | Other Consumer [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	442	308	471	375	258	895
Term Loan Amortized Cost [Member] | Pass [Member] | Other Consumer [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		550	517	633	256	127	1,044
Term Loan Amortized Cost [Member] | Special Mention | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross							393
Term Loan Amortized Cost [Member] | Special Mention | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross						591
Term Loan Amortized Cost [Member] | Special Mention | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross				23,520	4,146	8,801	4,513
Term Loan Amortized Cost [Member] | Special Mention | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross			62	186	2,173	873
Term Loan Amortized Cost [Member] | Special Mention | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross					2,304	945	12
Term Loan Amortized Cost [Member] | Special Mention | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross				1,205	0	621
Term Loan Amortized Cost [Member] | Special Mention | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross				1,233			712
Term Loan Amortized Cost [Member] | Substandard | Home Equity Loans [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross				120		1,539
Term Loan Amortized Cost [Member] | Substandard | Home Equity Loans [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross						11	1,935
Term Loan Amortized Cost [Member] | Substandard | Non-Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		720	0	933	4,026	32,599
Term Loan Amortized Cost [Member] | Substandard | Non-Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		743			4,934	20,602	11,600
Term Loan Amortized Cost [Member] | Substandard | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		38	319	0	1,347	61
Term Loan Amortized Cost [Member] | Substandard | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		41	76	160	1,474	132	189
Term Loan Amortized Cost [Member] | Substandard | Construction [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross						1,561
Term Loan Amortized Cost [Member] | Substandard | Construction [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross							2,247
Term Loan Amortized Cost [Member] | Substandard | Residential Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross				83	0	11,593
Term Loan Amortized Cost [Member] | Substandard | Residential Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross			1,040	671	511	1,468	20,066
Term Loan Amortized Cost [Member] | Doubtful | Commercial Business [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross						80
Term Loan Amortized Cost [Member] | Doubtful | Commercial Business [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross							420
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	963,263	250,385	211,101	273,995	253,993	456,353
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		281,402	257,970	401,845	349,279	361,402	387,362
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | Pass [Member] | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross	$ 963,263	250,385	211,101	264,174	248,058	438,642
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | Pass [Member] | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross		$ 281,402	$ 257,970	374,871	341,304	343,370	374,909
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | Special Mention | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross						6,814
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | Special Mention | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross				26,974	5,079	4,834	1,054
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | Substandard | June 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross				$ 9,821	5,935	10,897
Term Loan Amortized Cost [Member] | Multi-Family Mortgage [Member] | Substandard | June 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and leases receivable, Gross					$ 2,896	$ 13,198	$ 11,399