Quarterly report pursuant to Section 13 or 15(d)

Acquisition - Summarized of Consideration Paid, Assets Acquired and Liabilities Assumed (Detail)

v3.3.0.814
Acquisition - Summarized of Consideration Paid, Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Liabilities assumed:          
Bargain purchase gain, net of deferred taxes   $ 0 $ 14,577 $ 0 $ 14,577
Central Bancorp, Inc [Member]          
Consideration paid:          
CBI Stockholders $ 50,000        
Redemption of preferred stock and cumulative unpaid dividends 28,675        
Total consideration paid: 78,675        
Assets acquired:          
Cash and cash equivalents 197,209        
Securities available for sale 663,497        
Loans 297,272        
Premises and equipment 17,925        
OREO 25,952        
Income tax assets, net 12,011        
Core deposit intangible 2,213        
FDIC loss sharing asset 11,413        
Bank-owned life insurance 18,296        
Servicing assets 7,497        
Other assets 14,636        
Total assets acquired 1,267,921        
Liabilities assumed:          
Deposits 1,098,997        
Subordinated debentures 18,473        
Rescinded stock obligation 15,485        
FHLB advances 10,000        
Servicing liabilities 6,039        
Other liabilities 25,675        
Total liabilities assumed 1,174,669        
Total identifiable net assets 93,252        
Bargain purchase gain, net of deferred taxes $ 14,577