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Credit Losses textual (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Credit Loss [Line Items] |  |  |
Interest Receivable | $ 43,700,000 | $ 36,000,000 |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | (1,137,000) |
Loans and Leases Receivable, Allowance | (146,922,000) | (113,392,000) |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) | $ (33,500,000) |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) by percentage | 29.60% |  |
Provision for credit losses | $ 18,205,000 | 52,500,000 | $ 6,000,000
Off-Balance Sheet, Credit Loss, Liability | $ 1,500,000 | 1,200,000 |
Days To Be Termed As Non Accrual Loans | 90 days |  |
Tdrs Recorded Investment On Nonaccrual Status | $ 1,993,000 | 22,209,000 |
Financing Receivable, before Allowance for Credit Loss | 13,540,590,000 | 9,371,470,000 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 3,200,000 | 0 | $ 0
Loans with active Deferrals | 383,100,000 | 173,600,000 |
US Government Insured Loan Program [Member] |  |  |
Credit Loss [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 216,200,000 | $ 791,900,000 |
Blue Hills Bancorp, Inc. [Member] |  |  |
Credit Loss [Line Items] |  |  |
Loans with active Deferrals | $ 194,300,000 |  |

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