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v3.3.1.900

Subordinated Debentures and Rescinded Stock Obligation - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2005 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated debentures |  | $ 18,703 | $ 18,544 |  |  |
Rescinded stock obligation |  | 0 | 933 |  |  | $ 15,500
Accrued interest payable |  |  |  |  |  | 4,500
Rescinded stock obligation paid off |  | 933 | 14,552 | $ 0 |  |
Interest payable |  | 288 |  |  |  |
Central Bancorp, Inc [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument discount |  |  |  |  |  | $ 8,300
Amortization of subordinated debentures |  | $ 176 | 71 |  |  |
Central Bancorp, Inc [Member] | Subordinated Debentures [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated debentures, unpaid principal amount | $ 26,000 |  |  |  | $ 26,800 |
Subordinated debentures |  |  |  |  | 18,500 |
Debt instrument discount |  |  |  |  | $ 8,300 |
Fixed interest rate | 6.26% |  |  |  |  |
Effective interest rate period | 5 years |  |  |  |  |
Variable interest rate basis | 3 month LIBOR plus 140 basis |  |  |  |  |
Maturity date of subordinated debentures | Dec. 31, 2035 |  |  |  |  |
Frequency of interest payment |  | quarterly |  |  |  |
Interest deferral period (up to) |  | 5 years |  |  |  |
Amortization of subordinated debentures |  | $ 176 | $ 71 |  |  |
3-Month LIBOR [Member] | Central Bancorp, Inc [Member] | Subordinated Debentures [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread | 1.40% |  |  |  |  |

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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The cash outflow related to equity securities that embody an unconditional obligation requiring the issuer to redeem the securities by transferring the assets at a specified or determinable date (or dates) that is (or are) initially more than one year (or the normal operating cycle, if longer) from the issuance date, or upon an event that is certain to occur beyond one year (or the normal operating cycle, if longer) from the issuance date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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