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Loan Quality and Allowance for Loan Losses - Credit-Rating Classification of Loans Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 4,715,516	$ 4,567,915
Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,325,105	1,297,453
Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,249,215	1,302,961
Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	14,377	23,271
Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	66,476	85,825
Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	5,984	9,060
Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,956,571	1,758,584
Non-Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	4,680,905	4,538,570
Non-Classified [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,309,368	1,283,040
Non-Classified [Member] | Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,239,718	1,295,076
Non-Classified [Member] | Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	14,377	23,271
Non-Classified [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	59,966	80,947
Non-Classified [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	5,939	8,937
Non-Classified [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,955,366	1,758,468
Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	5,534	592
Special Mention [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	482	493
Special Mention [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	3,880	13
Special Mention [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	20	61
Special Mention [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,124
Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	29,077	28,752
Substandard [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	15,255	13,920
Substandard [Member] | Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	9,497	7,885
Substandard [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	2,630	4,865
Substandard [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	25	61
Substandard [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	81	116
Doubtful [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross		1
Doubtful [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross		1
Total Classified Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	34,611	29,345
Total Classified Loans [Member] | Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	15,737	14,413
Total Classified Loans [Member] | Non-Residential Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	9,497	7,885
Total Classified Loans [Member] | Commercial Business [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	6,510	4,878
Total Classified Loans [Member] | Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	45	123
Total Classified Loans [Member] | Multi-Family Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,205	116
Home Equity Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	97,788	90,761
Home Equity Loans [Member] | Non-Classified [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	96,171	88,831
Home Equity Loans [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	28	25
Home Equity Loans [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	1,589	1,905
Home Equity Loans [Member] | Total Classified Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and Leases Receivable, Gross	$ 1,617	$ 1,930

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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=82891408&loc=d3e4428-111522

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