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Borrowings and Subordinated Debentures - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 20, 2021 | Dec. 31, 2005 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Overnight advances from federal home loan banks |  |  | $ 50,000,000 |  | $ 50,000,000 |  | $ 225,000,000 |
Overnight advances (percent) |  |  |  |  |  |  | 4.78% |
Advances from the FHLB |  |  | $ 12,500,000 |  | $ 12,500,000 |  | $ 37,500,000 |
Weighted average interest rate of outstanding advances (percent) |  |  | 4.56% |  | 4.56% |  | 4.58% |
Interest expense on borrowings |  |  | $ 324,000 | $ 1,561,000 | $ 3,032,000 | $ 5,112,000 |  |
Pledged loans receivable, carrying value |  |  | 2,370,000,000 |  | 2,370,000,000 |  | $ 2,460,000,000 |
Remaining available borrowing capacity |  |  | 1,510,000,000 |  | 1,510,000,000 |  | 1,690,000,000 |
Loans pledged with FRB |  |  | 27,400,000 |  | 27,400,000 |  | 29,400,000 |
Borrowing capacity through Fed Discount Window |  |  | 25,600,000 |  | 25,600,000 |  | 27,600,000 |
Debt instrument, maturity date | Sep. 01, 2031 |  |  |  |  |  |  |
2031 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures issued | $ 110,000,000 |  |  |  |  |  |  |
Fixed interest rate | 3.75% |  |  |  |  |  |  |
Amortization of debt issuance costs | $ 2,100,000 |  |  |  |  |  |  |
Debt issuance costs, net |  |  | 108,700,000 |  | 108,700,000 |  | 108,500,000 |
Subordinated debentures | Central Bancorp, Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Subordinated debentures issued |  | $ 26,000,000 |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  | Mar. 15, 2036 |  |
Fixed interest rate |  | 6.26% |  |  |  |  |  |
Debt outstanding, net of issuance cost |  |  | 21,600,000 |  | 21,600,000 |  | 22,100,000 |
Unpaid principal balance |  |  |  |  |  |  |  | $ 26,800,000
Estimated fair value |  |  |  |  |  |  |  | 18,500,000
Debt instrument discount |  |  | 4,400,000 |  | $ 4,400,000 |  | $ 4,700,000 | $ 8,300,000
Frequency of interest payment |  |  |  |  | quarterly |  |  |
Term for the initial fixed interest rate |  |  |  |  | 5 years |  |  |
Optional interest payment deferral period (not to exceed) |  |  |  |  | 5 years |  |  |
Variable interest rate basis |  |  |  |  | three-month LIBOR plus 140 basis points |  |  |
Amortization of subordinated debentures |  |  | $ 104,000,000 | $ 112,000,000 |  |  |  |
Benchmark Rate | 2031 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread | 3.10% |  |  |  |  |  |  |
3-month London Interbank Offered Rate (LIBOR) | Subordinated debentures | Central Bancorp, Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 5.70% |  | 5.70% |  |  |
Basis spread |  | 1.40% |  |  |  |  |  |
3-Month Secured Overnight Financing Rate (SOFR ) | Subordinated debentures | Central Bancorp, Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 1.66% |  |  |
3-Month Secured Overnight Financing Rate (SOFR ) | Credit Spread | Subordinated debentures | Central Bancorp, Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 1.40% |  |  |
3-Month Secured Overnight Financing Rate (SOFR ) | Adjustment to Convert 3-month LIBOR to 3-month SOFR | Subordinated debentures | Central Bancorp, Inc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread |  |  |  |  | 0.26% |  |  |

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