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Borrowings and Subordinated Debentures - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 20, 2021 | Mar. 21, 2017 | Dec. 31, 2005 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Overnight advances from federal home loan banks |  |  |  | $ 0 |  | $ 0 |  | $ 0 |
Advances from the FHLB |  |  |  | $ 137,500,000 |  | $ 137,500,000 |  | $ 150,000,000.0 |
Weighted average interest rate of outstanding advances (percent) |  |  |  | 1.05% |  | 1.05% |  | 1.40% |
Interest expense on borrowings |  |  |  | $ 409,000 | $ 582,000 | $ 1,332,000 | $ 1,838,000 |  |
Borrowing |  |  |  | 0 |  | 0 |  | $ 0 |
Pledged loans receivable, carrying value |  |  |  | 2,170,000,000 |  | 2,170,000,000 |  | 2,170,000,000 |
Remaining available borrowing capacity |  |  |  | 1,370,000,000 |  | 1,370,000,000 |  |  |
FHLB statutory lending limit |  |  |  | 1,610,000,000 |  | 1,610,000,000 |  | 1,440,000,000 |
Loans pledged with FRB |  |  |  | 26,100,000 |  | 26,100,000 |  | 27,300,000 |
Borrowing capacity through Fed Discount Window |  |  |  | 24,600,000 |  | 24,600,000 |  | 26,300,000 |
Subordinated debentures issued |  |  |  | 224,100,000 |  | 224,100,000 |  | 126,800,000 |
Debt instrument, maturity date | Sep. 01, 2031 | Mar. 30, 2027 |  |  |  |  |  |  |
2017 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Subordinated debentures issued |  | $ 100,000,000.0 |  |  |  |  |  |  |
Fixed interest rate |  | 5.45% |  |  |  |  |  |  |
Debt issuance costs |  | $ 2,300,000 |  |  |  |  |  |  |
Debt outstanding, net of issuance cost |  |  |  | 86,100,000 |  | 86,100,000 |  | 98,500,000 |
Subordinated notes acquired |  |  |  | 12,700,000 |  | 12,700,000 |  |  |
Debt instrument, premium |  |  |  | 343,000,000,000 |  | 343,000,000,000 |  |  |
Amortization of debt issuance costs |  |  |  |  |  | 174,000 |  |  |
Incremental interest expense |  |  |  |  |  | 517,000 |  |  |
2021 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Subordinated debentures issued | $ 110,000,000.0 |  |  |  |  |  |  |  |
Fixed interest rate | 3.75% |  |  |  |  |  |  |  |
Amortization of debt issuance costs | $ 2,000,000.0 |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  |  | 108,000,000.0 |  | $ 108,000,000.0 |  |  |
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% |  |  |  |  |  |
Debt outstanding, net of issuance cost |  |  |  | 20,700,000 |  | $ 20,700,000 |  | 20,400,000 |
Unpaid principal balance |  |  |  |  |  |  |  |  | $ 26,800,000
Estimated fair value |  |  |  |  |  |  |  |  | 18,500,000
Debt instrument discount |  |  |  | 6,100,000 |  | $ 6,100,000 |  | $ 6,400,000 | $ 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 |  |  |  | $ 102,000 | $ 99,000 | $ 300,000 | $ 291,000 |  |
3-month London Interbank Offered Rate (LIBOR) | 2017 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread |  | 3.315% |  |  |  |  |  |  |
3-month London Interbank Offered Rate (LIBOR) | Subordinated debentures | Central Bancorp, Inc |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread |  |  | 140.00% |  |  |  |  |  |
Benchmark Rate | 2021 Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Basis spread | 3.10% |  |  |  |  |  |  |  |

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