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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
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Total loans $ 7,328,963 $ 7,004,308
Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 44,736 48,537
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 65,399 88,297
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 428 0
Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 110,563 136,834
Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 7,218,400 6,867,474
Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 5,109,868 4,857,109
Total loans 5,109,868 4,857,109
Mortgage Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 23,512 32,455
Mortgage Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 33,174 38,102
Mortgage Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Mortgage Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Mortgage Portfolio Segment [Member] | Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 56,686 70,557
Mortgage Portfolio Segment [Member] | Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 5,053,182 4,786,552
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,745,138 1,630,444
Commercial Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 20,738 14,840
Commercial Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 29,734 47,255
Commercial Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 428 0
Commercial Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Commercial Portfolio Segment [Member] | Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 50,900 62,095
Commercial Portfolio Segment [Member] | Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 1,694,238 1,568,349
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 473,957 516,755
Consumer Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 486 1,242
Consumer Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,491 2,940
Consumer Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Consumer Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 0 0
Consumer Portfolio Segment [Member] | Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 2,977 4,182
Consumer Portfolio Segment [Member] | Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total loans 470,980 512,573
Residential Real Estate [Member] | Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 1,142,347 1,211,672
Total loans 1,142,347 1,211,672
Residential Real Estate [Member] | Mortgage Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 4,325 6,563
Residential Real Estate [Member] | Mortgage Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 8,105 12,021
Residential Real Estate [Member] | Mortgage Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Residential Real Estate [Member] | Mortgage Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Residential Real Estate [Member] | Mortgage Portfolio Segment [Member] | Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 12,430 18,584
Residential Real Estate [Member] | Mortgage Portfolio Segment [Member] | Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 1,129,917 1,193,088
Commercial Real Estate [Member] | Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 2,171,056 1,978,569
Total loans 2,171,056 1,978,569
Commercial Real Estate [Member] | Mortgage Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 19,172 25,329
Commercial Real Estate [Member] | Mortgage Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 25,069 23,011
Commercial Real Estate [Member] | Mortgage Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0
Commercial Real Estate [Member] | Mortgage Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Commercial Real Estate [Member] | Mortgage Portfolio Segment [Member] | Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 44,241 48,340
Commercial Real Estate [Member] | Mortgage Portfolio Segment [Member] | Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 2,126,815 1,930,229
Multifamily [Member] | Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 1,403,885 1,402,054
Total loans 1,403,885 1,402,054
Multifamily [Member] | Mortgage Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 15 563
Multifamily [Member] | Mortgage Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 553
Multifamily [Member] | Mortgage Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Multifamily [Member] | Mortgage Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Multifamily [Member] | Mortgage Portfolio Segment [Member] | Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 15 1,116
Multifamily [Member] | Mortgage Portfolio Segment [Member] | Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 1,403,870 1,400,938
Construction Loans [Member] | Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 392,580 264,814
Total loans 392,580 264,814
Construction Loans [Member] | Mortgage Portfolio Segment [Member] | Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Construction Loans [Member] | Mortgage Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 2,517
Construction Loans [Member] | Mortgage Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Construction Loans [Member] | Mortgage Portfolio Segment [Member] | Loss [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 0
Construction Loans [Member] | Mortgage Portfolio Segment [Member] | Total Classified And Criticized [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans 0 2,517
Construction Loans [Member] | Mortgage Portfolio Segment [Member] | Acceptable/Watch [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total mortgage loans $ 392,580 $ 262,297