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Loans Receivable and Allowance for Loan Losses - Narrative (Detail)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Commitment
Loan
Jul. 11, 2016
USD ($)
Mar. 31, 2014
Allowance
Dec. 31, 2018
USD ($)
Allowance
Commitment
Loan
Dec. 31, 2017
USD ($)
Allowance
Commitment
Loan
Dec. 31, 2016
USD ($)
Allowance
Commitment
Loan
Financing Receivable, Modifications [Line Items]            
Loans held for sale, average life from purchase to sale (days)       23 days    
Loans receivable, net of allowance for loan losses, carrying value $ 8,503,522,000     $ 8,503,522,000 $ 8,523,651,000  
Available funds for reimbursement 500,000     500,000 600,000  
Individually evaluated for impairment 39,118,000     39,118,000 38,435,000  
Troubled debt restructurings loans $ 19,200,000     $ 19,200,000 $ 20,400,000 $ 16,400,000
Minimum performance requirement (months)       6 months    
Sustained performance period (months)       6 months    
Commitments to lend additional funds to debtors | Commitment 0     0 0 0
Number of Loans | Loan       41 40 64
TDR modification (allowance) | Allowance     0 0 1 0
Allowance for TDR modification         $ 1,000  
Threshold period to pay potential liability related to FDIC loss sharing agreements       45 days    
Payments for termination to FDIC   $ 1,400,000        
Loans held-for-investment, purchase price as a percentage of loans outstanding       99.90% 99.40%  
Payments to acquire loans receivable       $ 398,468,000 $ 264,090,000 $ 0
Gain (loss) on sales of loans       3,294,000 4,223,000 $ 3,685,000
Commercial and industrial            
Financing Receivable, Modifications [Line Items]            
Individually evaluated for impairment $ 17,828,000     17,828,000 17,461,000  
Other            
Financing Receivable, Modifications [Line Items]            
Individually evaluated for impairment 111,000     $ 111,000 $ 30,000  
Number of Loans | Loan       1 0 0
Manufactured housing            
Financing Receivable, Modifications [Line Items]            
Individually evaluated for impairment 10,195,000     $ 10,195,000 $ 10,089,000  
Number of Loans | Loan       38 36 58
Number of TDR loans that defaulted on payments | Loan         5 8
Amount of TDR loans that defaulted on payments         $ 200,000 $ 200,000
Commercial real estate non-owner occupied            
Financing Receivable, Modifications [Line Items]            
Individually evaluated for impairment 129,000     $ 129,000 $ 160,000  
Number of Loans | Loan       0 0 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]            
Individually evaluated for impairment 8,631,000     $ 8,631,000 $ 9,247,000  
Number of Loans | Loan       2 0 4
Number of TDR loans that defaulted on payments | Loan           1
Amount of TDR loans that defaulted on payments           $ 100,000
Multi-family            
Financing Receivable, Modifications [Line Items]            
Individually evaluated for impairment 1,155,000     $ 1,155,000 $ 0  
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 200,000     $ 200,000 300,000  
Foreclosure loans $ 2,100,000     $ 2,100,000 1,600,000  
Commercial and industrial (including owner occupied commercial real estate)            
Financing Receivable, Modifications [Line Items]            
Number of TDR loans that defaulted on payments | Loan       1    
Amount of TDR loans that defaulted on payments       $ 1,500,000 2,100,000  
Manufactured Housing            
Financing Receivable, Modifications [Line Items]            
Number of TDR loans that defaulted on payments | Loan 4          
Amount of TDR loans that defaulted on payments $ 100,000          
Federal Home Loan Bank of Pittsburgh            
Financing Receivable, Modifications [Line Items]            
Loans pledged as collateral $ 5,400,000,000     $ 5,400,000,000 $ 5,500,000,000  
Principal Forgiveness            
Financing Receivable, Modifications [Line Items]            
Number of Loans | Loan       0 0 0