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Loan Quality and Allowance for Loan Losses - Performance Status of Loans Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Jun. 30, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | $ 4,715,516 | $ 4,567,915
Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,325,105 | 1,297,453
Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,249,215 | 1,302,961
Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 14,377 | 23,271
Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 66,476 | 85,825
Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 5,984 | 9,060
Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,956,571 | 1,758,584
Home Equity Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 97,788 | 90,761
Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 4,694,195 | 4,551,056
Performing Financing Receivable [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,314,295 | 1,288,261
Performing Financing Receivable [Member] | Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,240,545 | 1,297,621
Performing Financing Receivable [Member] | Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 14,377 | 23,271
Performing Financing Receivable [Member] | Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 65,586 | 84,587
Performing Financing Receivable [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 5,960 | 9,000
Performing Financing Receivable [Member] | Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,956,490 | 1,758,468
Performing Financing Receivable [Member] | Home Equity Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 96,942 | 89,848
Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
90+ days past due accruing | 24 | 60
Nonaccrual | 21,297 | 16,799
Total nonperforming | 21,321 | 16,859
Nonperforming Financing Receivable [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 10,810 | 9,192
Total nonperforming | 10,810 | 9,192
Nonperforming Financing Receivable [Member] | Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 8,670 | 5,340
Total nonperforming | 8,670 | 5,340
Nonperforming Financing Receivable [Member] | Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 890 | 1,238
Total nonperforming | 890 | 1,238
Nonperforming Financing Receivable [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
90+ days past due accruing | 24 | 60
Total nonperforming | 24 | 60
Nonperforming Financing Receivable [Member] | Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 81 | 116
Total nonperforming | 81 | 116
Nonperforming Financing Receivable [Member] | Home Equity Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 846 | 913
Total nonperforming | $ 846 | $ 913

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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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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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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