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Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 21, 2017 | Dec. 31, 2005 | Dec. 31, 2005 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB advances |  |  |  | $ 50,000,000 |  | $ 315,000,000 |
Interest on FHLB advances |  |  |  | $ 468,000 | $ 195,000 |  |
Weighted-average interest rate |  |  |  | 0.70% | 0.43% |  |
Loans pledged as collateral |  |  |  | $ 1,000,000,000 |  |  |
Borrowing capacity |  |  |  | 760,300,000 |  |  |
Available borrowing capacity |  |  |  | 710,300,000 |  |  |
Loans pledged with FRB |  |  |  | 10,200,000 |  |  |
Borrowing capacity through Fed Discount Window |  |  |  | 9,900,000 |  |  |
Outstanding borrowings |  |  |  | 0 |  | 0 |
Subordinated Debentures [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debentures issued | $ 100,000,000 |  |  |  |  |  |
Fixed interest rate | 5.45% |  |  |  |  |  |
Debt issue cost | $ 2,000,000 |  |  |  |  |  |
Debt outstanding, net of issuance cost |  |  |  | 97,700,000 |  |  |
Amortization of debt issue costs |  |  |  | 4,000 |  |  |
Subordinated Debentures [Member] | 3-month London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread | 3.315% |  |  |  |  |  |
Central Bancorp, Inc [Member] | Subordinated Debentures [Member] |  |  |  |  |  |  |
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 |  |  |  | 19,100,000 |  | 19,000,000 |
Unpaid principal balance |  |  |  |  |  |  | $ 26,800,000
Estimated fair value |  |  |  |  |  |  | 18,500,000
Debt instrument discount |  |  |  | 7,700,000 |  | $ 7,800,000 | $ 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 |  |  |  | $ 77,000 | $ 56,000 |  |
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 Borrowing capacity available based on pledged collateral. + References No definition available. + Details
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- Definition Borrowing capacity 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://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 Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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 Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + 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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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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(a)(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 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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