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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits that would affect our effective tax rate if recognized | $ 1,000,000 | $ 900,000 | $ 1,800,000
Decrease in unrecognized tax benefits due to lapse of statute of limitations | 0 | 831,000 | 0
Increase in unrecognized tax benefits | 105,000 |  | 676,000
Decrease in unrecognized tax benefits related to non-qualified stock option | 0 | 0 | 165,000
Accrued interest on uncertain tax benefits | 33,000 | 20,000 | 52,000
Accrued interest related to uncertain tax positions, net of federal tax benefit | 101,000 | 67,000 | 366,000
Income tax deductions due to excess tax benefits | 614,000 |  |
Increase in deferred tax assets, allowance for loan losses and net operating loss carryforwards | 1,000,000 |  |
Valuation allowance | 1,031,000 | 0 | $ 0
Operating Loss Carryforwards [Line Items] |  |  |
Federal alternative minimum tax credit | 400,000 |  |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 5,200,000 |  |
Low income housing tax credit | 2,800,000 |  |
State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 236,600,000 |  |
Low income housing tax credit | 440,000 |  |
Central Bancorp, Inc [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Increase in deferred tax assets | $ 5,800,000 | $ 18,100,000 |

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