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Loan Quality and Allowance for Loan Losses - Contractual Payment Status of Loans Receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 4,627,157 | $ 4,722,752
Total past due | 26,563 | 8,201
Loans and Leases Receivable, Gross | 4,653,720 | 4,730,953
Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,313,195 | 1,338,347
Total past due | 6,555 | 5,697
Loans and Leases Receivable, Gross | 1,319,750 | 1,344,044
Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,214,524 | 1,256,892
Total past due | 16,439 | 1,977
Loans and Leases Receivable, Gross | 1,230,963 | 1,258,869
Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 14,501 | 13,907
Total past due | 136 |
Loans and Leases Receivable, Gross | 14,637 | 13,907
Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 66,749 | 65,668
Total past due | 140 | 95
Loans and Leases Receivable, Gross | 66,889 | 65,763
Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 5,160 | 5,754
Total past due | 49 | 60
Loans and Leases Receivable, Gross | 5,209 | 5,814
Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,919,907 | 1,946,391
Total past due | 3,061 |
Loans and Leases Receivable, Gross | 1,922,968 | 1,946,391
Past due: 30-59 days [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 20,312 | 1,997
Past due: 30-59 days [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 2,721 | 1,680
Past due: 30-59 days [Member] | Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 14,462 |
Past due: 30-59 days [Member] | Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 49 | 95
Past due: 30-59 days [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 19 | 25
Past due: 30-59 days [Member] | Multi-Family Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 3,061 |
Past due: 60-89 days [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 689 | 522
Past due: 60-89 days [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 470 | 473
Past due: 60-89 days [Member] | Construction [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 136 |
Past due: 60-89 days [Member] | Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 68 |
Past due: 60-89 days [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 15 | 13
Past due: 90 days and over [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 5,562 | 5,682
Past due: 90 days and over [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 3,364 | 3,544
Past due: 90 days and over [Member] | Non-Residential Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 1,977 | 1,977
Past due: 90 days and over [Member] | Commercial Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 23 |
Past due: 90 days and over [Member] | Other Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | 15 | 22
Home Equity Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 93,121 | 95,793
Total past due | 183 | 372
Loans and Leases Receivable, Gross | 93,304 | 96,165
Home Equity Loans [Member] | Past due: 30-59 days [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due |  | 197
Home Equity Loans [Member] | Past due: 60-89 days [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due |  | 36
Home Equity Loans [Member] | Past due: 90 days and over [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total past due | $ 183 | $ 139

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