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) - Aug. 31, 2014 - Central Bancorp, Inc [Member] - USD ($)
$ in Thousands
Total
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 assets 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Rescinded stock obligation 15,485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