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Loan Quality and Allowance for Loan Losses - Contractual Payment Status of Loans Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jun. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current $ 4,705,452 $ 4,557,210
Total past due 10,064 10,705
Loans and Leases Receivable, Gross 4,715,516 4,567,915
Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,318,191 1,290,428
Total past due 6,914 7,025
Loans and Leases Receivable, Gross 1,325,105 1,297,453
Non-Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,247,238 1,300,570
Total past due 1,977 2,391
Loans and Leases Receivable, Gross 1,249,215 1,302,961
Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 14,377 23,271
Loans and Leases Receivable, Gross 14,377 23,271
Commercial Business [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 65,614 85,065
Total past due 862 760
Loans and Leases Receivable, Gross 66,476 85,825
Other Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 5,922 8,917
Total past due 62 143
Loans and Leases Receivable, Gross 5,984 9,060
Multi-Family Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 1,956,571 1,758,584
Loans and Leases Receivable, Gross 1,956,571 1,758,584
Past due: 30-59 days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,992 2,847
Past due: 30-59 days [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,447 1,457
Past due: 30-59 days [Member] | Non-Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   1,015
Past due: 30-59 days [Member] | Commercial Business [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 526 247
Past due: 30-59 days [Member] | Other Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 19 24
Past due: 60-89 days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 19 578
Past due: 60-89 days [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   475
Past due: 60-89 days [Member] | Other Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 19 59
Past due: 90+ days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 8,053 7,280
Past due: 90+ days [Member] | Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 5,467 5,093
Past due: 90+ days [Member] | Non-Residential Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 1,977 1,376
Past due: 90+ days [Member] | Commercial Business [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 336 513
Past due: 90+ days [Member] | Other Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due 24 60
Home Equity Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 97,539 90,375
Total past due 249 386
Loans and Leases Receivable, Gross 97,788 90,761
Home Equity Loans [Member] | Past due: 30-59 days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   104
Home Equity Loans [Member] | Past due: 60-89 days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due   44
Home Equity Loans [Member] | Past due: 90+ days [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total past due $ 249 $ 238