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Subordinated Debentures and Rescinded Stock Obligation - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2005 | Dec. 31, 2005 | Jun. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amortization of subordinated debentures |  |  | $ 41,000 | $ 79,000 |  |  |
Rescinded stock obligation |  |  | 150,000 | 150,000 | $ 933,000 |  | $ 15,500,000
Accrued interest payable |  |  | 65,000 | 65,000 | $ 288,000 |  | 4,500,000
Central Bancorp, Inc [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Estimated fair value |  |  |  |  |  |  | 18,473,000
Central Bancorp, Inc [Member] | Subordinated Debentures [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unpaid principal balance |  |  |  |  |  | $ 26,800,000 |
Estimated fair value |  |  |  |  |  | 18,500,000 |
Debt instrument discount |  |  |  |  |  | $ 8,300,000 | $ 8,300,000
Subordinated debentures issued | $ 26,000,000.0 | $ 26,000,000.0 |  |  |  |  |
Fixed interest rate | 6.26% | 6.26% |  |  |  |  |
Term for the initial fixed interest rate |  | 5 years |  |  |  |  |
Variable interest rate basis |  | 3 month LIBOR plus 140 basis |  |  |  |  |
Optional interest payment deferral period (not to exceed) |  | 5 years |  |  |  |  |
Amortization of subordinated debentures |  |  | $ 41,000 | $ 79,000 |  |  |
3-month London Interbank Offered Rate (LIBOR) [Member] | Central Bancorp, Inc [Member] | Subordinated Debentures [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread | 1.40% |  |  |  |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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