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Allowance for Credit Losses - Allowance for Credit Losses and Balance of Loans Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	$ 48,877	$ 47,613	$ 47,058	$ 48,216	$ 51,785	$ 58,165
Loans individually analyzed	40,500
Financing receivable, before allowance for credit loss, fee and loan in process	6,001,107		5,436,576
Unaccreted yield adjustments	(16,974)		(18,731)
Loans receivable	5,984,133		5,417,845
Commercial Loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	4,233,255		3,745,866
Commercial Loan | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	27,498	26,246	25,321	25,795	24,982	28,450
Financing receivable, before allowance for credit loss, fee and loan in process	2,851,721		2,409,090
Commercial Loan | Nonresidential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	8,593	9,152	10,590	10,078	13,845	16,243
Financing receivable, before allowance for credit loss, fee and loan in process	1,017,341		1,019,838
Commercial Loan | Commercial business
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	1,819	1,972	1,792	1,903	1,994	2,086
Financing receivable, before allowance for credit loss, fee and loan in process	177,530		176,807
Commercial Loan | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	1,201	1,120	1,486	1,441	1,430	1,170
Financing receivable, before allowance for credit loss, fee and loan in process	186,663		140,131
One-to Four-Family Residential Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	9,355	8,801	7,540	8,601	9,129	9,747
Financing receivable, before allowance for credit loss, fee and loan in process	1,719,514		1,645,816
Consumer Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, before allowance for credit loss, fee and loan in process	48,338		44,894
Consumer Loans | Home equity loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	339	244	245	308	318	433
Financing receivable, before allowance for credit loss, fee and loan in process	45,690		42,028
Consumer Loans | Other consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest	72	$ 78	84	$ 90	$ 87	$ 36
Financing receivable, before allowance for credit loss, fee and loan in process	2,648		2,866
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	22		26
Loans acquired with deteriorated credit quality collectively evaluated	246		311
Loans individually analyzed	763		793
Loans collectively evaluated	18,469		18,553
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality collectively evaluated	0		0
Loans individually analyzed	0		0
Loans collectively evaluated	0		0
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Nonresidential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality collectively evaluated	80		73
Loans individually analyzed	353		377
Loans collectively evaluated	3,696		5,033
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Commercial business
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality collectively evaluated	5		9
Loans individually analyzed	0		0
Loans collectively evaluated	3,964		1,267
Receivables Acquired with Deteriorated Credit Quality | Commercial Loan | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality collectively evaluated	0		0
Loans individually analyzed	0		0
Loans collectively evaluated	5,735		5,735
Receivables Acquired with Deteriorated Credit Quality | One-to Four-Family Residential Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	22		0
Loans acquired with deteriorated credit quality collectively evaluated	161		229
Loans individually analyzed	385		87
Loans collectively evaluated	5,019		6,460
Receivables Acquired with Deteriorated Credit Quality | Consumer Loans | Home equity loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		26
Loans acquired with deteriorated credit quality collectively evaluated	0		0
Loans individually analyzed	25		329
Loans collectively evaluated	55		58
Receivables Acquired with Deteriorated Credit Quality | Consumer Loans | Other consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality 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]
Financing receivable, allowance for credit losses, individually evaluated for impairment	2,829		3,709
Loans acquired with deteriorated credit quality collectively evaluated	45,780		43,012
Loans individually analyzed	39,786		69,528
Loans collectively evaluated	5,942,089		5,347,702
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Multi-family mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	352		849
Loans acquired with deteriorated credit quality collectively evaluated	27,146		24,472
Loans individually analyzed	16,271		26,653
Loans collectively evaluated	2,835,450		2,382,437
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Nonresidential mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	2,392		2,696
Loans acquired with deteriorated credit quality collectively evaluated	6,121		7,821
Loans individually analyzed	17,530		31,517
Loans collectively evaluated	995,762		982,911
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Commercial business
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	17		16
Loans acquired with deteriorated credit quality collectively evaluated	1,797		1,767
Loans individually analyzed	272		293
Loans collectively evaluated	173,294		175,247
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Commercial Loan | Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality collectively evaluated	1,201		1,486
Loans individually analyzed	0		1,561
Loans collectively evaluated	180,928		132,835
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | One-to Four-Family Residential Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	68		148
Loans acquired with deteriorated credit quality collectively evaluated	9,104		7,163
Loans individually analyzed	5,652		8,402
Loans collectively evaluated	1,708,458		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]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality collectively evaluated	339		219
Loans individually analyzed	61		1,102
Loans collectively evaluated	45,549		40,539
Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Consumer Loans | Other consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing receivable, allowance for credit losses, individually evaluated for impairment	0		0
Loans acquired with deteriorated credit quality collectively evaluated	72		84
Loans individually analyzed	0		0
Loans collectively evaluated	$ 2,648		$ 2,866

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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