Quarterly report pursuant to Section 13 or 15(d)

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

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Acquisition - Summarized of Consideration Paid, Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Aug. 31, 2014
Aug. 31, 2014
Central Bancorp, Inc [Member]
Aug. 31, 2014
Central Bancorp, Inc [Member]
Aug. 31, 2014
Central Bancorp, Inc [Member]
Subordinated Debentures [Member]
Loans At Acquisition Date [Line Items]            
CBI Stockholders       $ 50,000    
Redemption of preferred stock and cumulative unpaid dividends       28,675    
Accrued interest on subordinated debentures           1,566
Total consideration paid:       80,241    
Assets acquired:            
Cash and cash equivalents         197,209  
Securities available for sale         663,497  
Loans         294,032  
Premises and equipment         17,735  
Other real estate owned         28,027  
Income tax assets, net         8,800  
Core deposit intangible     2,213   2,213  
FDIC loss sharing assets         9,692  
Bank-owned life insurance         18,296  
Other assets         16,428  
Total assets acquired         1,255,929  
Liabilities assumed:            
Deposits         1,098,997  
Subordinated debentures         18,473  
Rescinded stock obligation         15,720  
FHLB advances         10,000  
Other liabilities         25,905  
Total liabilities assumed         1,169,095  
Total identifiable net assets         86,834  
Bargain purchase gain, net of deferred taxes $ 6,593 $ 6,593   $ 6,593