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LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 12, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loans, Allowance for Loan Losses and Credit Quality [Abstract] |  |  |  |  |
Days To Be Termed As Non Accrual Loans |  | 90 days |  |  |
Tdrs Recorded Investment On Nonaccrual Status |  | $ 1,993,000 | $ 22,209,000 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 13,540,590,000 | 9,371,470,000 |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  | (1,137,000) |  |
Financing Receivable, Credit Loss, Expense (Reversal) |  | 18,205,000 | 52,500,000 | $ 6,000,000 |
Financing Receivable, Allowance for Credit Loss |  | 146,922,000 | 113,392,000 | 67,740,000 | $ 64,293,000
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  | 1,157,000 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | 3,200,000 | 0 | $ 0 |
Loans with active Deferrals |  | 383,100,000 | 173,600,000 |  |
Credit Loss Status [Domain] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) |  | 32,500,000 |  |  |
US Government Insured Loan Program [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 216,200,000 | $ 791,900,000 |  |
Blue Hills Bancorp, Inc. [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | $ 50,700,000 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | $ 67,200,000 |  |  |

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