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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
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual $ 34,929 $ 42,401
90 days or more past due and accruing 0 0
Total Past Due 52,458 60,708
Current 7,276,505 6,943,600
Total gross loans 7,328,963 7,004,308
Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 12,311 10,108
Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 5,218 8,199
Mortgage Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 15,195 22,584
90 days or more past due and accruing 0 0
Total Past Due 28,815 35,118
Current 5,081,053 4,821,991
Total gross loans 5,109,868 4,857,109
Mortgage Portfolio Segment [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 8,105 12,021
90 days or more past due and accruing 0 0
Total Past Due 20,239 24,475
Current 1,122,108 1,187,197
Total gross loans 1,142,347 1,211,672
Mortgage Portfolio Segment [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 7,090 7,493
90 days or more past due and accruing 0 0
Total Past Due 8,576 7,573
Current 2,162,480 1,970,996
Total gross loans 2,171,056 1,978,569
Mortgage Portfolio Segment [Member] | Multifamily [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 0 553
90 days or more past due and accruing 0 0
Total Past Due 0 553
Current 1,403,885 1,401,501
Total gross loans 1,403,885 1,402,054
Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 0 2,517
90 days or more past due and accruing 0 0
Total Past Due 0 2,517
Current 392,580 262,297
Total gross loans 392,580 264,814
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 9,295 5,891
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 7,809 5,891
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 1,486 0
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Multifamily [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 0 0
Mortgage Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable 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]    
Loans receivable past due 4,325 6,643
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 4,325 6,563
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 0 80
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Multifamily [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 0 0
Mortgage Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 0 0
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 17,243 16,787
90 days or more past due and accruing 0 0
Total Past Due 18,200 18,800
Current 1,726,938 1,611,644
Total gross loans 1,745,138 1,630,444
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 551 1,656
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 406 357
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual 2,491 3,030
90 days or more past due and accruing 0 0
Total Past Due 5,443 6,790
Current 468,514 509,965
Total gross loans 473,957 516,755
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due 2,465 2,561
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable past due $ 487 $ 1,199