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Loan Quality and Allowance for Loan Losses - Allowance for Loan Losses and Balance of Loans Receivable (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	$ 33,274	$ 30,865
Allowance, Loans individually evaluated for impairment	42		$ 31
Allowance, Loans collectively evaluated for impairment	32,390		33,243
Allowance	32,432	32,731
Loans individually evaluated for impairment	27,489		24,259
Loans collectively evaluated for impairment	4,625,914		4,706,368
Loans and Leases Receivable, Gross	4,653,720		4,730,953
Loans receivable, unamortized yield adjustments	(48,982)		(52,025)
Loans receivable	4,604,738		4,678,928
Total charge offs	(64)	(262)
Total recoveries	4	28
(Reversal of) provision for loan losses	(782)	2,100
Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	3,377	2,479
Allowance, Loans individually evaluated for impairment	34		31
Allowance, Loans collectively evaluated for impairment	3,273		3,346
Allowance	3,307	2,594
Loans individually evaluated for impairment	11,119		12,545
Loans collectively evaluated for impairment	1,308,549		1,331,415
Loans and Leases Receivable, Gross	1,319,750		1,344,044
Total charge offs		(82)
(Reversal of) provision for loan losses	(70)	197
Non-Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	9,672	9,787
Allowance, Loans collectively evaluated for impairment	9,371		9,672
Allowance	9,371	9,945
Loans individually evaluated for impairment	8,750		8,900
Loans collectively evaluated for impairment	1,222,213		1,249,969
Loans and Leases Receivable, Gross	1,230,963		1,258,869
Total charge offs		(54)
Total recoveries		1
(Reversal of) provision for loan losses	(301)	211
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	136	258
Allowance, Loans collectively evaluated for impairment	140		136
Allowance	140	293
Loans collectively evaluated for impairment	14,637		13,907
Loans and Leases Receivable, Gross	14,637		13,907
(Reversal of) provision for loan losses	4	35
Commercial Business [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	2,467	2,552
Allowance, Loans individually evaluated for impairment	8
Allowance, Loans collectively evaluated for impairment	2,285		2,467
Allowance	2,293	2,803
Loans individually evaluated for impairment	3,083		1,213
Loans collectively evaluated for impairment	63,571		64,308
Loans and Leases Receivable, Gross	66,889		65,763
Total charge offs		(19)
(Reversal of) provision for loan losses	(174)	270
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	172	413
Allowance, Loans collectively evaluated for impairment	141		172
Allowance	141	345
Loans collectively evaluated for impairment	5,209		5,814
Loans and Leases Receivable, Gross	5,209		5,814
Total charge offs	(64)	(107)
Total recoveries	4	27
(Reversal of) provision for loan losses	29	12
Multi-Family Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	16,959	14,946
Allowance, Loans collectively evaluated for impairment	16,702		16,959
Allowance	16,702	16,317
Loans individually evaluated for impairment	3,061		70
Loans collectively evaluated for impairment	1,919,907		1,946,321
Loans and Leases Receivable, Gross	1,922,968		1,946,391
(Reversal of) provision for loan losses	(257)	1,371
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	317		326
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	82		84
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial Business [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans acquired with deteriorated credit quality	235		242
Home Equity Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance	491	430
Allowance, Loans collectively evaluated for impairment	478		491
Allowance	478	434
Loans individually evaluated for impairment	1,476		1,531
Loans collectively evaluated for impairment	91,828		94,634
Loans and Leases Receivable, Gross	93,304		$ 96,165
(Reversal of) provision for loan losses	$ (13)	$ 4

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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