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Loan Quality and Allowance for Loan Losses - Credit-Rating Classification of Loans Receivable (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross $ 4,730,953 $ 4,567,915
Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,344,044 1,297,453
Non-Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,258,869 1,302,961
Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 13,907 23,271
Commercial Business [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 65,763 85,825
Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 5,814 9,060
Multi-Family Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,946,391 1,758,584
Home Equity Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 96,165 90,761
Non-Classified [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 4,697,449 4,538,570
Non-Classified [Member] | Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,328,811 1,283,040
Non-Classified [Member] | Non-Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,249,438 1,295,076
Non-Classified [Member] | Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 13,907 23,271
Non-Classified [Member] | Commercial Business [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 59,768 80,947
Non-Classified [Member] | Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 5,776 8,937
Non-Classified [Member] | Multi-Family Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,945,205 1,758,468
Non-Classified [Member] | Home Equity Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 94,544 88,831
Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 5,681 592
Special Mention [Member] | Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 629 493
Special Mention [Member] | Commercial Business [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 3,894 13
Special Mention [Member] | Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 14 61
Special Mention [Member] | Multi-Family Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,116  
Special Mention [Member] | Home Equity Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 28 25
Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 27,822 28,752
Substandard [Member] | Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 14,604 13,920
Substandard [Member] | Non-Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 9,431 7,885
Substandard [Member] | Commercial Business [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 2,101 4,865
Substandard [Member] | Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 23 61
Substandard [Member] | Multi-Family Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 70 116
Substandard [Member] | Home Equity Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,593 1,905
Doubtful [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1 1
Doubtful [Member] | Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1 1
Total Classified Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 33,504 29,345
Total Classified Loans [Member] | Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 15,233 14,413
Total Classified Loans [Member] | Non-Residential Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 9,431 7,885
Total Classified Loans [Member] | Commercial Business [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 5,995 4,878
Total Classified Loans [Member] | Other Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 38 123
Total Classified Loans [Member] | Multi-Family Mortgage [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross 1,186 116
Total Classified Loans [Member] | Home Equity Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans and Leases Receivable, Gross $ 1,621 $ 1,930