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Loans Receivable - Performance Status of Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Jun. 30, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	$ 6,001,107	$ 5,436,576
Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	4,233,255	3,745,866
One-to Four-Family Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,719,514	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	48,338	44,894
Performing
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	5,960,558	5,366,255
Performing | One-to Four-Family Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,713,477	1,637,327
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	23,255	25,026
Nonaccrual Loans with no Allowance for Credit Losses	17,294	45,295
Financing receivable, before allowance for credit loss, fee and loan in process	40,549	70,321
Nonperforming | One-to Four-Family Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	2,916	3,543
Nonaccrual Loans with no Allowance for Credit Losses	3,121	4,946
Financing receivable, before allowance for credit loss, fee and loan in process	6,037	8,489
Multi-family mortgage | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,851,721	2,409,090
Multi-family mortgage | Performing | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,835,450	2,382,437
Multi-family mortgage | Nonperforming | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	7,890	8,367
Nonaccrual Loans with no Allowance for Credit Losses	8,381	18,286
Financing receivable, before allowance for credit loss, fee and loan in process	16,271	26,653
Nonresidential mortgage | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	1,017,341	1,019,838
Nonresidential mortgage | Performing | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	999,458	987,944
Nonresidential mortgage | Nonperforming | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	12,187	12,602
Nonaccrual Loans with no Allowance for Credit Losses	5,696	19,292
Financing receivable, before allowance for credit loss, fee and loan in process	17,883	31,894
Commercial business | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	177,530	176,807
Commercial business | Performing | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	177,258	176,514
Commercial business | Nonperforming | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 Days and Over Past Due Accruing	0	0
Nonaccrual Loans with Allowance for Credit Losses	262	212
Nonaccrual Loans with no Allowance for Credit Losses	10	81
Financing receivable, before allowance for credit loss, fee and loan in process	272	293
Construction | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	186,663	140,131
Construction | Performing | Commercial Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	186,663	138,570
Construction | Nonperforming | Commercial Loan
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	1,561
Financing receivable, before allowance for credit loss, fee and loan in process	0	1,561
Home equity loans | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	45,690	42,028
Home equity loans | Performing | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	45,604	40,597
Home equity loans | Nonperforming | Consumer Loans
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	302
Nonaccrual Loans with no Allowance for Credit Losses	86	1,129
Financing receivable, before allowance for credit loss, fee and loan in process	86	1,431
Other consumer | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,648	2,866
Other consumer | Performing | Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	2,648	2,866
Other consumer | Nonperforming | Consumer Loans
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

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