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Acquisition - Business Acquisition, Unaudited Proforma Result of Operation Information (Detail) (Central Bancorp, Inc [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Central Bancorp, Inc [Member] |  |  |  |
Loans At Acquisition Date [Line Items] |  |  |  |
Pro forma revenues (net interest income plus noninterest income) | $ 62,427 | $ 55,727 | $ 170,923 | $ 182,135
Pro forma net income from continuing operations | $ 18,359 | $ 12,826 | $ 43,546 | $ 47,201
Pro forma earnings per share from continuing operations: |  |  |  |
Basic | $ 0.58 | $ 0.41 | $ 1.37 | $ 1.49
Diluted | $ 0.57 | $ 0.40 | $ 1.36 | $ 1.49

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