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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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- 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 + Details
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