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Loan Quality and Allowance for Loan Losses - Credit-Rating Classification of Loans Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 4,653,720	$ 4,730,953
Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,319,750	1,344,044
Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,230,963	1,258,869
Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	14,637	13,907
Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	66,889	65,763
Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	5,209	5,814
Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,922,968	1,946,391
Non-Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	4,617,716	4,697,449
Non-Classified [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,305,660	1,328,811
Non-Classified [Member] | Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,221,692	1,249,438
Non-Classified [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	14,637	13,907
Non-Classified [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	60,105	59,768
Non-Classified [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	5,174	5,776
Non-Classified [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,918,799	1,945,205
Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	4,695	5,681
Special Mention [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	509	629
Special Mention [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	2,896	3,894
Special Mention [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	16	14
Special Mention [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,108	1,116
Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	31,307	27,822
Substandard [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	13,581	14,604
Substandard [Member] | Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	9,271	9,431
Substandard [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	3,888	2,101
Substandard [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	17	23
Substandard [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	3,061	70
Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	2	1
Doubtful [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	2	1
Total Classified Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	36,004	33,504
Total Classified Loans [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	14,090	15,233
Total Classified Loans [Member] | Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	9,271	9,431
Total Classified Loans [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	6,784	5,995
Total Classified Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	35	38
Total Classified Loans [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	4,169	1,186
Home Equity Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	93,304	96,165
Home Equity Loans [Member] | Non-Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	91,649	94,544
Home Equity Loans [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	166	28
Home Equity Loans [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,489	1,593
Home Equity Loans [Member] | Total Classified Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 1,655	$ 1,621

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+ References

No definition available.

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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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