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Subordinated Debentures - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 20, 2021 | Mar. 21, 2017 | Dec. 31, 2005 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debentures issued |  |  |  | $ 136,800,000 | $ 136,800,000 |  |
Debt instrument, maturity date | Sep. 01, 2031 | Mar. 30, 2027 |  |  |  |  |
Amortization of debt issuance costs | $ 2,100,000 |  |  |  |  |  |
2031 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debentures issued | $ 110,000,000.0 |  |  |  |  |  |
Fixed interest rate | 3.75% |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  | 183,000,000 | 176,000,000 | $ 62,000,000 |
Debt issuance costs, net |  |  |  | 108,300,000 | 108,200,000 |  |
2031 Notes | Benchmark Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread | 3.10% |  |  |  |  |  |
2017 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debentures issued |  | $ 100,000,000.0 |  |  |  |  |
Fixed interest rate |  | 5.45% |  |  |  |  |
Debt issuance cost |  | $ 2,300,000 |  |  |  |  |
Debt outstanding, net of issuance cost |  |  |  | $ 108,300,000 | 108,200,000 |  |
2017 Notes | 3-month London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread |  | 3.315% |  |  |  |  |
Subordinated debentures |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  | 1,100,000 | 300,000 |
Subordinated debentures | Central Bancorp, Inc |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Subordinated debentures issued |  |  | $ 26,000,000.0 |  |  |  |
Debt instrument, maturity date |  |  |  | Mar. 15, 2036 |  |  |
Fixed interest rate |  |  | 6.26% | 7.05% |  |  |
Debt outstanding, net of issuance cost |  |  |  | $ 21,700,000 | 21,200,000 |  |
Unpaid principal balance |  |  |  |  |  |  | $ 26,800,000
Estimated fair value |  |  |  |  |  |  | 18,500,000
Debt instrument discount |  |  |  | $ 5,100,000 | 5,600,000 |  | $ 8,300,000
Frequency of interest payment |  |  |  | quarterly |  |  |
Term for the initial fixed interest rate |  |  |  | 5 years |  |  |
Variable interest rate basis |  |  |  | three-month LIBOR plus 140 basis points |  |  |
Amortization of subordinated debentures |  |  |  | $ 420,000 | $ 412,000 | $ 402,000 |
Optional interest payment deferral period (not to exceed) |  |  |  | 5 years |  |  |
Subordinated debentures | 3-month London Interbank Offered Rate (LIBOR) | Central Bancorp, Inc |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread |  |  | 140.00% |  |  |  |
Subordinated debentures | Three Month Secured Overnight Financing Rate SOFR | Central Bancorp, Inc |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread |  |  |  | 166.00% |  |  |
2027 Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of redemption price of outstanding principal amount. |  |  |  |  | 100.00% |  |
Unamortized debt issuance cost |  |  |  |  | $ 1,100,000 |  |
Credit Spread [Member] | Subordinated debentures | Three Month Secured Overnight Financing Rate SOFR | Central Bancorp, Inc |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread |  |  |  | 140.00% |  |  |
Three Month Libor To Three Month Sofr [Member] | Subordinated debentures | Three Month Secured Overnight Financing Rate SOFR | Central Bancorp, Inc |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread |  |  |  | 26.00% |  |  |

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