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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail)
3 Months Ended
Mar. 31, 2018
USD ($)
Allowance
Commitment
Loan
Mar. 31, 2017
USD ($)
Allowance
Loan
Dec. 31, 2017
USD ($)
Commitment
Financing Receivable, Modifications [Line Items]      
Funds for reimbursement $ 600,000    
Loans reported as TDR $ 19,000,000   $ 20,400,000
Minimum performance requirement 6 months    
Sustained performance period 9 months    
Number of commitments to lend additional funds (commitment) | Commitment 0   0
Loans modified as TDR allowance (allowance) | Allowance 0 0  
Residential mortgage loans acquired   $ 0  
Loans receivable, net of allowance for loan losses $ 6,904,067,000   $ 6,730,243,000
Gain on sale of SBA and other loans 1,361,000 $ 1,328,000  
Term of fixed rate residential mortgage loans   30 years  
Purchase price as a percentage of loans outstanding   98.50%  
Residential real estate      
Financing Receivable, Modifications [Line Items]      
Residential real estate held in other real estate owned 300,000    
Loans in process of foreclosure $ 1,200,000   $ 1,600,000
Commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Number of loans modified as TDR (loan) | Loan 1    
Loans modified as TDR $ 2,100,000    
Manufactured housing      
Financing Receivable, Modifications [Line Items]      
Number of loans modified as TDR (loan) | Loan 1 5  
Loans modified as TDR $ 29,000 $ 200,000  
Loans modified as TDR allowance (allowance) | Allowance 1    
Allowance for credit losses, effect of change in method $ 1,000    
Small Business Administration Loan      
Financing Receivable, Modifications [Line Items]      
Loans receivable, net of allowance for loan losses 15,000,000 8,700,000  
Gain on sale of SBA and other loans 1,400,000 800,000  
Residential Mortgage Loan Commitments      
Financing Receivable, Modifications [Line Items]      
Loans receivable, net of allowance for loan losses   174,200,000  
Multi-family      
Financing Receivable, Modifications [Line Items]      
Loans receivable, net of allowance for loan losses   94,900,000  
Loans receivable, net   95,400,000  
Gain on sale of SBA and other loans   $ 500,000  
Federal Home Loan Bank of Pittsburgh      
Financing Receivable, Modifications [Line Items]      
Loans pledged as collateral $ 5,500,000,000