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Allowance for Credit Losses - Allowance for Credit Losses and Balance of Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	$ 48,734	$ 47,058	$ 58,165	$ 37,327
Loans individually analyzed	42,600
Total	5,850,476	5,436,576
Unaccreted yield adjustments	(21,055)	(18,731)
Total loans receivable, net of yield adjustments	5,829,421	5,417,845
Commercial business | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	26,362	25,321
Total	2,761,775	2,409,090
Commercial business | Nonresidential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	8,953	10,590
Total	968,574	1,019,838
Commercial business | Commercial business
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	1,440	1,792
Total	146,861	176,807
Commercial business | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	1,336	1,486
Total	226,609	140,131
Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	10,237	7,540	9,747	4,860
Total	1,700,559	1,645,816
Consumer loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	46,098	44,894
Consumer loans | Home equity loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	338	245	433	568
Total	43,549	42,028
Consumer loans | Other consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance for credit losses	68	84	$ 36	$ 58
Total	2,549	2,866
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	3	26
Loans collectively evaluated	211	311
Loans individually analyzed	928	793
Loans collectively evaluated	17,967	18,553
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	0	0
Loans individually analyzed	0	0
Loans collectively evaluated	0	0
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Nonresidential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	70	73
Loans individually analyzed	333	377
Loans collectively evaluated	3,562	5,033
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Commercial business
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	9	9
Loans individually analyzed	0	0
Loans collectively evaluated	4,237	1,267
Receivables Acquired with Deteriorated Credit Quality | Commercial business | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	0	0
Loans individually analyzed	0	0
Loans collectively evaluated	5,735	5,735
Receivables Acquired with Deteriorated Credit Quality | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	3	0
Loans collectively evaluated	132	229
Loans individually analyzed	570	87
Loans collectively evaluated	4,433	6,460
Receivables Acquired with Deteriorated Credit Quality | Consumer loans | Home equity loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	26
Loans collectively evaluated	0	0
Loans individually analyzed	25	329
Loans collectively evaluated	0	58
Receivables Acquired with Deteriorated Credit Quality | Consumer loans | Other consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	0	0
Loans individually analyzed	0	0
Loans collectively evaluated	0	0
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	3,417	3,709
Loans collectively evaluated	45,103	43,012
Loans individually analyzed	41,699	69,528
Loans collectively evaluated	5,789,882	5,347,702
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	326	849
Loans collectively evaluated	26,036	24,472
Loans individually analyzed	19,114	26,653
Loans collectively evaluated	2,742,661	2,382,437
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Nonresidential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	3,001	2,696
Loans collectively evaluated	5,882	7,821
Loans individually analyzed	16,207	31,517
Loans collectively evaluated	948,472	982,911
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Commercial business
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	20	16
Loans collectively evaluated	1,411	1,767
Loans individually analyzed	252	293
Loans collectively evaluated	142,372	175,247
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial business | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	1,336	1,486
Loans individually analyzed	0	1,561
Loans collectively evaluated	220,874	132,835
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Residential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	70	148
Loans collectively evaluated	10,032	7,163
Loans individually analyzed	6,101	8,402
Loans collectively evaluated	1,689,455	1,630,867
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Home equity loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	338	219
Loans individually analyzed	25	1,102
Loans collectively evaluated	43,499	40,539
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer loans | Other consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually analyzed	0	0
Loans collectively evaluated	68	84
Loans individually analyzed	0	0
Loans collectively evaluated	$ 2,549	$ 2,866

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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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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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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