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Loan Quality and Allowance for Loan Losses - Performance Status of Loans Receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | $ 4,653,720 | $ 4,730,953
Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,319,750 | 1,344,044
Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,230,963 | 1,258,869
Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 14,637 | 13,907
Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 66,889 | 65,763
Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 5,209 | 5,814
Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,922,968 | 1,946,391
Home Equity Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 93,304 | 96,165
Performing Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 4,631,939 | 4,710,683
Performing Financing Receivable [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,311,214 | 1,334,101
Performing Financing Receivable [Member] | Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,222,213 | 1,249,969
Performing Financing Receivable [Member] | Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 14,637 | 13,907
Performing Financing Receivable [Member] | Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 66,327 | 65,294
Performing Financing Receivable [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 5,194 | 5,792
Performing Financing Receivable [Member] | Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 1,919,907 | 1,946,321
Performing Financing Receivable [Member] | Home Equity Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans and Leases Receivable, Gross | 92,447 | 95,299
Nonperforming Financing Receivable [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
90 days and over past due accruing | 15 | 22
Nonaccrual | 21,766 | 20,248
Total nonperforming | 21,781 | 20,270
Nonperforming Financing Receivable [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 8,536 | 9,943
Total nonperforming | 8,536 | 9,943
Nonperforming Financing Receivable [Member] | Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 8,750 | 8,900
Total nonperforming | 8,750 | 8,900
Nonperforming Financing Receivable [Member] | Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 562 | 469
Total nonperforming | 562 | 469
Nonperforming Financing Receivable [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
90 days and over past due accruing | 15 | 22
Total nonperforming | 15 | 22
Nonperforming Financing Receivable [Member] | Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 3,061 | 70
Total nonperforming | 3,061 | 70
Nonperforming Financing Receivable [Member] | Home Equity Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual | 857 | 866
Total nonperforming | $ 857 | $ 866

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- Definition Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 Reference 2: 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=118936363&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 + Details
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