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Employee Benefits - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Bank-Owned Life Insurance [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Cash surrender value | $ 49,400,000 |  |
Central Bancorp, Inc [Member] | Bank-Owned Life Insurance [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Cash surrender value | 17,300,000 |  |
Deferred compensation plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Liabilities for the deferred compensation plan and interest | $ 0 | $ 0 |
401(k) Plan [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percent of participant contributions (percent) | 75.00% |  |
Percent of employer contribution (up to, percent) | 8.00% |  |
Contributions | $ 1,900,000 | $ 1,600,000 | $ 1,300,000

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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