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Loans Receivable and Allowance for Loan Losses (Summary of Aging Loans Receivable by Portfolio Segment and Class) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 36,448 $ 42,401
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 52,347 60,708
Current 6,977,320 6,943,600
Total gross loans 7,029,667 7,004,308
Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 10,758 10,108
Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 5,141 8,199
Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 16,890 22,584
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 27,288 35,118
Current 4,812,275 4,821,991
Total gross loans 4,839,563 4,857,109
Mortgage Portfolio Segment [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 8,820 12,021
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 18,318 24,475
Current 1,138,993 1,187,197
Total gross loans 1,157,311 1,211,672
Mortgage Portfolio Segment [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 8,070 7,493
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 8,970 7,573
Current 2,013,606 1,970,996
Total gross loans 2,022,576 1,978,569
Mortgage Portfolio Segment [Member] | Multi-Family [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 0 553
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 0 553
Current 1,334,984 1,401,501
Total gross loans 1,334,984 1,402,054
Mortgage Portfolio Segment [Member] | Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 0 2,517
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 0 2,517
Current 324,692 262,297
Total gross loans 324,692 264,814
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 6,581 5,891
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 5,973 5,891
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 608 0
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Multi-Family [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 3,817 6,643
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 3,525 6,563
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 292 80
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Multi-Family [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 0 0
Commercial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 17,523 16,787
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 19,637 18,800
Current 1,689,205 1,611,644
Total gross loans 1,708,842 1,630,444
Commercial Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 1,870 1,656
Commercial Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 244 357
Consumer Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,035 3,030
Recorded Investment greater than 90 days accruing 0 0
Total Past Due 5,422 6,790
Current 475,840 509,965
Total gross loans 481,262 516,755
Consumer Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due 2,307 2,561
Consumer Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Recorded investment past due $ 1,080 $ 1,199