Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

v3.2.0.727
Loans - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Property
SecurityLoan
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Property
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Property
Sep. 30, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accrued interest receivable $ 8,133,000   $ 8,133,000   $ 9,749,000  
Loans receivable 2,826,086,000   2,826,086,000   2,735,832,000  
Transfer of loans receivable to loans held for sale 360,000 $ 0 360,000 $ 0    
Sale of loans held for sale 19,689,000 6,759,000 39,543,000 12,717,000    
Loans reclassified from held to sale to loans receivable 0 0 0 0    
Allowance for off-balance sheet items 1,000,000 1,600,000 1,000,000 1,600,000    
Loans on non-accrual status $ 28,023,000   $ 28,023,000   $ 25,282,000  
Number of real estate properties | Property 19   19   25  
Other real estate owned (OREO), net $ 11,857,000   $ 11,857,000   $ 15,790,000  
TDR loans receivable 21,900,000   $ 21,900,000   26,300,000  
Principal and interest due     3 months      
Reserves relating to loans included in allowance for loan losses $ 2,000,000   $ 2,000,000   2,900,000  
Number of loans restructured | SecurityLoan 3          
Serviced loans sold to unaffiliated parties $ 486,100,000 $ 333,000,000 $ 486,100,000 $ 333,000,000    
Insurance reimbursements settlement           $ 611,000,000
Recoveries of previously charged-off and reimbursed Commercial SLA loans which needs to be reimbursed     95.00%      
Recovery period     3 years      
FDIC loss sharing asset 116,000   $ 116,000      
FDIC recoveries partially offset     806,000      
Reimbursable expense owed to bank     690,000      
Single-family loans covered 116,000   116,000      
PCI Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 32,556,000   32,556,000   43,475,000  
Delinquent loans (defined as 30 days or more past due) 21,054,000   21,054,000   31,406,000  
Outstanding balance of PCI loans - the undiscounted sum of all amounts including amounts deemed principal, interest, fees and penalties 49,000,000   $ 49,000,000   64,300,000  
Minimum [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recoveries of previously charged-off and reimbursed Commercial SLA loans which needs to be reimbursed     95.00%      
Maximum [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Recoveries of previously charged-off and reimbursed Commercial SLA loans which needs to be reimbursed     80.00%      
Central Bancorp, Inc [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other real estate owned (OREO), net 10,600,000   $ 10,600,000   15,300,000  
Securities Pledged as Collateral [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 735,200,000   735,200,000   840,000,000  
Residential Properties [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other real estate owned (OREO), net 572,000   572,000      
Loans and Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accrued interest receivable $ 6,100,000   $ 6,100,000   $ 6,400,000