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Loans Receivable and Allowance for Loan Losses - Narrative (Detail)
3 Months Ended 12 Months Ended
Jul. 11, 2016
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Mar. 31, 2014
Allowance
Dec. 31, 2017
USD ($)
Allowance
Commitment
Loan
Dec. 31, 2016
USD ($)
Allowance
Commitment
Loan
Dec. 31, 2015
USD ($)
Commitment
Loan
Financing Receivable, Modifications [Line Items]                
Loans held for sale, average life from purchase to sale (days)           22 days    
Loans receivable, net of allowance for loan losses, carrying value           $ 8,523,651,000 $ 8,234,137,000  
Available funds for reimbursement           600,000 1,000,000  
Individually evaluated for impairment           38,435,000 29,411,000  
Troubled debt restructurings loans           $ 20,400,000 $ 16,400,000 $ 11,400,000
Minimum performance requirement (months)           6 months    
Sustained performance period (months)           6 months    
Commitments to lend additional funds to debtors | Commitment           0 0 0
Number of Loans | Loan           40 64 162
Number of TDR loans that defaulted on payments | Loan               11
TDR modification (allowance) | Allowance         0 3    
Payments for termination to FDIC $ 1,400,000              
Mortgage loans on real estate, loans acquired   $ 90,000,000 $ 174,200,000 $ 0        
Loans held-for-investment, term     30 years          
Loans held-for-investment, purchase price as a percentage of loans outstanding   101.00% 98.50%          
Gain (loss) on sales of loans           $ 4,223,000 $ 3,685,000 $ 4,047,000
Commercial and industrial (including owner occupied commercial real estate)                
Financing Receivable, Modifications [Line Items]                
TDR modification (allowance) | Allowance             2  
Allowance for TDR modification             $ 200,000  
Commercial real estate non-owner occupied                
Financing Receivable, Modifications [Line Items]                
TDR modification (allowance) | Allowance             1  
Allowance for TDR modification             $ 100,000  
Commercial and industrial                
Financing Receivable, Modifications [Line Items]                
Individually evaluated for impairment           17,461,000 8,516,000  
Other                
Financing Receivable, Modifications [Line Items]                
Individually evaluated for impairment           30,000 57,000  
Manufactured housing                
Financing Receivable, Modifications [Line Items]                
Individually evaluated for impairment           $ 10,089,000 $ 9,665,000  
Number of Loans | Loan           36 58 156
Number of TDR loans that defaulted on payments | Loan           5 8  
Amount of TDR loans that defaulted on payments           $ 200,000 $ 200,000 $ 300,000
Commercial real estate - non-owner occupied                
Financing Receivable, Modifications [Line Items]                
Individually evaluated for impairment           $ 160,000 $ 2,151,000  
Number of Loans | Loan           0 1 1
Number of TDR loans that defaulted on payments | Loan             1  
Amount of TDR loans that defaulted on payments             $ 1,800,000  
Residential real estate                
Financing Receivable, Modifications [Line Items]                
Loans receivable, net of allowance for loan losses, carrying value           $ 191,600,000    
Individually evaluated for impairment           $ 9,247,000 $ 6,972,000  
Number of Loans | Loan           0 4 2
Number of TDR loans that defaulted on payments | Loan             1  
Amount of TDR loans that defaulted on payments             $ 100,000  
Gain (loss) on sales of loans           $ 200,000    
Multi-family                
Financing Receivable, Modifications [Line Items]                
Loans receivable, net of allowance for loan losses, carrying value           226,900,000    
Individually evaluated for impairment           0 0  
Gain (loss) on sales of loans           $ 400,000    
Commercial                
Financing Receivable, Modifications [Line Items]                
Gain (loss) on sales of loans             100,000  
Troubled Debt Restructurings                
Financing Receivable, Modifications [Line Items]                
Sustained performance period (months)           9 months    
Residential Real Estate                
Financing Receivable, Modifications [Line Items]                
Other real estate owned           $ 300,000 500,000  
Foreclosure loans           1,600,000 400,000  
Commercial and industrial (including owner occupied commercial real estate)                
Financing Receivable, Modifications [Line Items]                
Loans receivable, net of allowance for loan losses, carrying value           $ 3,900,000    
Number of TDR loans that defaulted on payments | Loan           1    
Amount of TDR loans that defaulted on payments           $ 2,100,000    
Gain (loss) on sales of loans           $ 100,000    
Number of loans | Loan           1    
Small Business Administration Loan                
Financing Receivable, Modifications [Line Items]                
Loans receivable, net of allowance for loan losses, carrying value           $ 35,800,000 33,300,000  
Gain (loss) on sales of loans           $ 3,500,000 3,700,000  
Manufactured Housing                
Financing Receivable, Modifications [Line Items]                
TDR modification (allowance) | Allowance           1    
Allowance for TDR modification           $ 1,000    
Commercial                
Financing Receivable, Modifications [Line Items]                
Loans receivable, net of allowance for loan losses, carrying value             5,700,000  
Federal Home Loan Bank of Pittsburgh                
Financing Receivable, Modifications [Line Items]                
Loans pledged as collateral           $ 5,500,000,000 4,800,000,000  
Held and Used | Commercial and industrial                
Financing Receivable, Modifications [Line Items]                
Loans receivable, net of allowance for loan losses, carrying value             11,500,000  
Held and Used | Other                
Financing Receivable, Modifications [Line Items]                
Loans receivable, net of allowance for loan losses, carrying value             $ 700,000  
Principal Forgiveness                
Financing Receivable, Modifications [Line Items]                
Number of Loans | Loan           0 0 0