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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized tax benefits that would affect our effective tax rate if recognized |  | $ 202 | $ 1,000 | $ 1,000
Decrease in unrecognized tax benefits due to lapse of statute of limitations |  | 837 | 0 | 0
Increase in unrecognized tax benefits |  |  |  | 105
Accrued interest on uncertain tax benefits |  | 10 | 34 | 33
Accrued interest related to uncertain tax positions, net of federal tax benefit |  | 57 | 132 | 101
Income tax deductions due to excess tax benefits |  | 37 | 1,800 |
Valuation allowance |  | 4,852 | $ 2,750 | 1,031
Increase in deferred tax assets, allowance for loan losses and net operating loss carryforwards |  | 2,100 |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Change to provisional amount related to remeasurement of deferred tax assets and liabilities |  | 1,100 |  |
Federal [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards |  | 210,700 |  |
State [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Low income housing tax credit |  | 204 |  |
Central Bancorp, Inc |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Increase in deferred tax assets |  | $ 5,000 |  | $ 13,900
ASU 2018-02 |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Adjustment impact of adoption of Tax Act | $ 399 |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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