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Borrowings and Subordinated Debentures - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 21, 2017 | Dec. 31, 2005 | Dec. 31, 2005 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 0 |  | $ 0 |  | $ 55,000,000 |
Interest on borrowings |  |  |  | 0 | $ 1,015,000 | $ 72,000 | $ 1,694,000 |  |
Weighted-average interest rate |  |  |  |  | 1.90% | 2.74% | 1.74% |  |
Loans pledged as collateral |  |  |  | 1,200,000,000 |  | $ 1,200,000,000 |  |  |
Borrowing capacity |  |  |  | 1,000,000,000.0 |  | 1,000,000,000.0 |  |  |
Available borrowing capacity |  |  |  | 905,000,000.0 |  | 905,000,000.0 |  |  |
Loans pledged with FRB |  |  |  | 30,000,000.0 |  | 30,000,000.0 |  |  |
Borrowing capacity through Fed Discount Window |  |  |  | 29,600,000 |  | 29,600,000 |  |  |
Outstanding borrowings |  |  |  | 0 |  | 0 |  | 0 |
Subordinated Debentures |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Subordinated debentures issued | $ 100,000,000 |  |  |  |  |  |  |  |
Fixed interest rate | 5.45% |  |  |  |  |  |  |  |
Debt issue cost | $ 2,300,000 |  |  |  |  |  |  |  |
Debt outstanding, net of issuance cost |  |  |  | 98,200,000 |  | 98,200,000 |  | 98,100,000 |
Amortization of debt issue costs |  |  |  | 48,000 | $ 45,000 | 95,000 | $ 90,000 |  |
Subordinated Debentures | 3-month London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread | 3.315% |  |  |  |  |  |  |  |
Central Bancorp, Inc | Subordinated Debentures |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Subordinated debentures issued |  | $ 26,000,000.0 | $ 26,000,000.0 |  |  |  |  |  |
Fixed interest rate |  | 6.26% | 6.26% |  |  |  |  |  |
Debt outstanding, net of issuance cost |  |  |  | 19,900,000 |  | 19,900,000 |  | 19,700,000 |
Unpaid principal balance |  |  |  |  |  |  |  |  | $ 26,800,000
Estimated fair value |  |  |  |  |  |  |  |  | 18,500,000
Debt instrument discount |  |  |  | 7,000,000.0 |  | 7,000,000.0 |  | $ 7,100,000 | $ 8,300,000
Term for the initial fixed interest rate |  |  | 5 years |  |  |  |  |  |
Optional interest payment deferral period (not to exceed) |  |  | 5 years |  |  |  |  |  |
Amortization of discount on debentures |  |  |  | $ 92,000 | $ 86,000 | $ 184,000 | $ 172,000 |  |
Central Bancorp, Inc | Subordinated Debentures | 3-month London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread |  | 1.40% |  |  |  |  |  |  |

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- Definition Borrowing capacity available based on pledged collateral. + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Unpaid Principal Balance Of Long Term Debt + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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