Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

v3.3.0.814
Loans - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Property
SecurityLoan
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Property
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Property
Dec. 31, 2013
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accrued interest receivable $ 8,722,000   $ 8,722,000   $ 9,749,000  
Loans receivable 2,998,712,000   2,998,712,000   2,735,832,000  
Transfer of loans receivable to loans held for sale 0 $ 0 360,000 $ 0    
Sale of loans held for sale 20,607,000 14,268,000 60,150,000 26,986,000    
Loans reclassified from held to sale to loans receivable 0 0 0 0    
Allowance for off-balance sheet items 556,000 1,500,000 556,000 1,500,000    
Loans on non-accrual status $ 23,944,000   $ 23,944,000   $ 25,282,000  
Number of real estate properties | Property 17   17   25  
Other real estate owned (OREO), net $ 13,249,000   $ 13,249,000   $ 15,790,000  
TDR loans receivable 18,200,000   $ 18,200,000   26,300,000  
Principal and interest due     3 months      
Reserves relating to loans included in allowance for loan losses $ 614,000   $ 614,000   2,900,000  
Number of loans restructured | SecurityLoan 7          
Serviced loans sold to unaffiliated parties $ 468,900,000 341,600,000 $ 468,900,000 341,600,000    
Insurance reimbursements settlement   611,000,000   611,000,000    
Recoveries of previously charged-off and reimbursed Commercial SLA loans which needs to be reimbursed     80.00%      
Recovery period     3 years      
FDIC recoveries partially offset     $ 1,300,000      
FDIC loss sharing asset 136,000   136,000      
Net payable to the FDIC 1,173,000   1,173,000   2,074,000  
Non-Single Family Share-Loss Agreement [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net payable to the FDIC 1,200,000   1,200,000      
Single Family Share-Loss Agreement [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Net payable to the FDIC 47,000   47,000      
PCI Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 22,007,000 $ 67,024,000 22,007,000 $ 67,024,000 43,475,000 $ 0
Past due loans receivable 11,845,000   11,845,000   31,406,000  
Outstanding balance of PCI loans - the undiscounted sum of all amounts including amounts deemed principal, interest, fees and penalties 33,200,000   $ 33,200,000   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 10,800,000   $ 10,800,000   15,300,000  
Securities Pledged as Collateral [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans receivable 606,400,000   606,400,000   840,000,000  
Residential Properties [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other real estate owned (OREO), net 2,000,000   2,000,000      
Loans and Finance Receivables [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Accrued interest receivable $ 6,000,000   $ 6,000,000   $ 6,400,000