Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

v3.5.0.2
Loans - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Property
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Property
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable   $ 10,552   $ 9,501  
Loans receivable   3,409,603   $ 3,140,381  
Transfer of loans receivable to loans held for sale $ 360 $ 0 $ 360    
Number of real estate properties | Property   17   14  
Other real estate owned (OREO), net   $ 11,846   $ 8,511  
TDR loans receivable   $ 15,800   17,200  
Principal and interest due   3 months      
Reserves relating to loans included in allowance for loan losses   $ 400   1,000  
PCI Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable $ 32,556 9,572 $ 32,556 14,573 $ 43,475
Outstanding balance of PCI loans - the undiscounted sum of all amounts including amounts deemed principal, interest, fees and penalties   19,100   30,900  
Central Bancorp, Inc [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Other real estate owned (OREO), net   6,700   7,400  
Securities Pledged as Collateral [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable   758,400   557,700  
Loans and Finance Receivables [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable   $ 7,300   $ 7,900