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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

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