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Loans Receivable and Allowance for Loan Losses (Summary of Loans Receivable by Credit Quality Risk Rating Indicator) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans $ 7,029,667 $ 7,004,308
Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 117,833 136,834
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 50,214 48,537
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 66,848 88,297
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 771 0
Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 6,911,834 6,867,474
Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 4,839,563 4,857,109
Mortgage Portfolio Segment [Member] | Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 57,431 70,557
Mortgage Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 22,978 32,455
Mortgage Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 34,453 38,102
Mortgage Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 4,782,132 4,786,552
Mortgage Portfolio Segment [Member] | Residential [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,157,311 1,211,672
Mortgage Portfolio Segment [Member] | Residential [Member] | Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 12,345 18,584
Mortgage Portfolio Segment [Member] | Residential [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 3,525 6,563
Mortgage Portfolio Segment [Member] | Residential [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 8,820 12,021
Mortgage Portfolio Segment [Member] | Residential [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Residential [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Residential [Member] | Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,144,966 1,193,088
Mortgage Portfolio Segment [Member] | Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,022,576 1,978,569
Mortgage Portfolio Segment [Member] | Commercial [Member] | Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 45,070 48,340
Mortgage Portfolio Segment [Member] | Commercial [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 19,437 25,329
Mortgage Portfolio Segment [Member] | Commercial [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 25,633 23,011
Mortgage Portfolio Segment [Member] | Commercial [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Commercial [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Commercial [Member] | Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,977,506 1,930,229
Mortgage Portfolio Segment [Member] | Multi-Family [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,334,984 1,402,054
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 16 1,116
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 16 563
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 553
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Multi-Family [Member] | Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,334,968 1,400,938
Mortgage Portfolio Segment [Member] | Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 324,692 264,814
Mortgage Portfolio Segment [Member] | Construction [Member] | Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 2,517
Mortgage Portfolio Segment [Member] | Construction [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Construction [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 2,517
Mortgage Portfolio Segment [Member] | Construction [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Construction [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Mortgage Portfolio Segment [Member] | Construction [Member] | Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 324,692 262,297
Commercial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,708,842 1,630,444
Commercial Loans [Member] | Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 57,288 62,095
Commercial Loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 26,156 14,840
Commercial Loans [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 30,361 47,255
Commercial Loans [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 771 0
Commercial Loans [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Commercial Loans [Member] | Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,651,554 1,568,349
Consumer Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 481,262 516,755
Consumer Loans [Member] | Total classified and criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 3,114 4,182
Consumer Loans [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,080 1,242
Consumer Loans [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,034 2,940
Consumer Loans [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Consumer Loans [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 0 0
Consumer Loans [Member] | Pass/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans $ 478,148 $ 512,573