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LOANS RECEIVABLE - Performance Status of Loans Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	$ 5,756,938	$ 5,850,476
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	3,964,628	4,103,819
Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,746,065	1,700,559
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	46,245	46,098
Nonperforming
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	3,138	19,212
Nonaccrual Loans with no Allowance for Credit Losses	24,951	23,415
Financing receivable, before allowance for credit loss, fee and loan in process	28,089	42,627
Nonperforming | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	385	1,640
Nonaccrual Loans with no Allowance for Credit Losses	6,519	5,031
Financing receivable, before allowance for credit loss, fee and loan in process	6,904	6,671
Performing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	5,728,849	5,807,849
Performing | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,739,161	1,693,888
Multi-family mortgage | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,651,274	2,761,775
Multi-family mortgage | Nonperforming | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	1,939	5,686
Nonaccrual Loans with no Allowance for Credit Losses	14,049	13,428
Financing receivable, before allowance for credit loss, fee and loan in process	15,988	19,114
Multi-family mortgage | Performing | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,635,286	2,742,661
Nonresidential mortgage | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	947,287	968,574
Nonresidential mortgage | Nonperforming | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	0	11,815
Nonaccrual Loans with no Allowance for Credit Losses	4,335	4,725
Financing receivable, before allowance for credit loss, fee and loan in process	4,335	16,540
Nonresidential mortgage | Performing | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	942,952	952,034
Commercial business | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	144,134	146,861
Commercial business | Nonperforming | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	814	71
Nonaccrual Loans with no Allowance for Credit Losses	1	181
Financing receivable, before allowance for credit loss, fee and loan in process	815	252
Commercial business | Performing | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	143,319	146,609
Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	221,933	226,609
Construction | Nonperforming | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	0	0
Nonaccrual Loans with no Allowance for Credit Losses	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	0	0
Construction | Performing | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	221,933	226,609
Home equity loans | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	43,517	43,549
Home equity loans | Nonperforming | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	0	0
Nonaccrual Loans with no Allowance for Credit Losses	47	50
Financing receivable, before allowance for credit loss, fee and loan in process	47	50
Home equity loans | Performing | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	43,470	43,499
Other consumer | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,728	2,549
Other consumer | Nonperforming | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	0	0
Nonaccrual Loans with no Allowance for Credit Losses	0	0
Financing receivable, before allowance for credit loss, fee and loan in process	0	0
Other consumer | Performing | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	$ 2,728	$ 2,549

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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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