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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits that would affect our effective tax rate if recognized | $ 1,000 | $ 1,000 | $ 900
Decrease in unrecognized tax benefits due to lapse of statute of limitations | 0 | 0 | 831
Increase in unrecognized tax benefits | 105 |  |
Accrued interest on uncertain tax benefits | 34 | 33 | 20
Accrued interest related to uncertain tax positions, net of federal tax benefit | 132 | 101 | 67
Income tax deductions due to excess tax benefits | 1,800 | 614 |
Increase in deferred tax assets, allowance for loan losses and net operating loss carryforwards | 1,000 |  |
Valuation allowance | 2,750 | 1,031 | $ 0
Provisional decrease to deferred tax assets and liabilities | 3,900 |  |
Net adjustment to deferred income tax expense | 3,900 |  |
Federal [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating loss carryforwards | 223,000 |  |
Low income housing tax credit | 1,000 |  |
State [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Low income housing tax credit | 200 |  |
Central Bancorp, Inc [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Increase in deferred tax assets | $ 13,900 | $ 5,800 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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