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Debt - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2005 | Dec. 31, 2005 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
FHLB advances |  |  | $ 280,000,000 |  | $ 280,000,000 |  | $ 170,000,000 |
Interest on FHLB advances |  |  | $ 299,000 | $ 4,000 | $ 494,000 | $ 60,000 |  |
Weighted-average interest rate |  |  | 0.43% | 0.21% | 0.43% | 0.18% |  |
Loans pledged as collateral |  |  | $ 723,500,000 |  | $ 723,500,000 |  |  |
Borrowing capacity |  |  | 529,600,000 |  | 529,600,000 |  |  |
Available borrowing capacity |  |  | 249,600,000 |  | 249,600,000 |  |  |
Loans pledged with FRB |  |  | 35,000,000 |  | 35,000,000 |  |  |
Borrowing capacity through Fed Discount Window |  |  | 24,300,000 |  | 24,300,000 |  |  |
Outstanding borrowings |  |  | 0 |  | 0 |  | $ 0 |
Amortization of subordinated debentures |  |  | $ 62,000 | $ 41,000 | $ 118,000 | $ 78,000 |  |
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
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 |  |  |  |  |  |
Optional interest payment deferral period (not to exceed) |  | 5 years |  |  |  |  |  |
Central Bancorp, Inc [Member] | Subordinated Debentures [Member] | 3-month London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread | 1.40% |  |  |  |  |  |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + 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 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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