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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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