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Acquisition - Business Acquisition, Unaudited Proforma Result of Operation Information (Detail) - Central Bancorp, Inc [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Loans At Acquisition Date [Line Items] |  |  |  |
Pro forma revenues (net interest income plus noninterest income) | $ 53,491 | $ 49,343 | $ 107,022 | $ 105,589
Pro forma net income from continuing operations | $ 15,276 | $ 8,521 | $ 27,887 | $ 24,801
Pro forma earnings per share from continuing operations: |  |  |  |
Basic (in usd per share) | $ 0.48 | $ 0.27 | $ 0.88 | $ 0.78
Diluted (in usd per share) | $ 0.48 | $ 0.27 | $ 0.87 | $ 0.78

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