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Subordinated Debentures and Rescinded Stock Obligation - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2014 | Aug. 31, 2014 | Sep. 30, 2014 Central Bancorp, Inc [Member] Subordinated Debentures [Member] | Sep. 30, 2014 Central Bancorp, Inc [Member] Subordinated Debentures [Member] | Dec. 31, 2005 Central Bancorp, Inc [Member] Subordinated Debentures [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated debentures, notional amount |  |  |  | $ 26,800,000 | $ 26,800,000 | $ 26,000,000
Subordinated debentures | 18,509,000 | 18,509,000 |  | 18,500,000 | 18,500,000 |
Debt instrument discount |  |  | 8,300,000 | 8,300,000 | 8,300,000 |
Fixed interest rate |  |  |  |  |  | 6.26%
Variable interest rate basis |  |  |  |  | 3 month LIBOR plus 140 basis |
Maturity date of subordinated debentures |  |  |  |  | Dec. 31, 2035 |
Frequency of interest payment |  |  |  |  | Quarterly |
Amortization of subordinated debentures | 35,000 | 36,000 |  | 35,000 |  |
Rescinded stock obligation | 15,720,000 | 15,720,000 |  |  |  |
Accrued interest payable | 5,100,000 | 5,100,000 | 4,900,000 |  |  |
Interest on rescinded stock obligation | $ 87,000 | $ 87,000 |  |  |  |
Weighted average interest rate | 6.79% | 6.79% |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: 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 + Details
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