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LOANS, ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 12, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Receivables [Abstract] |  |  |  |  |
Days To Be Termed As Non Accrual Loans |  | 90 days |  |  |
Tdrs Recorded Investment On Nonaccrual Status |  | $ 11,520,000 | $ 1,993,000 |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | 13,928,675,000 | 13,587,286,000 |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  | $ (1,137,000) |
Financing Receivable, Credit Loss, Expense (Reversal) |  | 6,500,000 | 18,205,000 | 52,500,000 |
Financing Receivable, Allowance for Credit Loss |  | 152,419,000 | 146,922,000 | 113,392,000 | $ 67,740,000
Financing Receivable, Allowance for Credit Losses, Purchased with Credit Deterioration |  |  |  | $ 1,200,000 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans with active Deferrals |  | 55,600,000 | 383,100,000 |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  | (5,500,000) |  |  |
Off-Balance Sheet, Credit Loss, Liability |  | $ 1,300,000 | 1,500,000 |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) by percentage |  | 3.70% |  |  |
Financing Receivable, Unamortized Loan Cost (Fee) |  | $ 5,000,000 | (159,000) |  |
Financing Receivable, Unamortized Loan Cost (Fee) and Purchase Premium (Discount) |  | (10,400,000) | (10,400,000) |  |
US Government Insured Loan Program [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 9,100,000 | $ 216,200,000 |  |
Blue Hills Bancorp, Inc. [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) | $ 50,700,000 |  |  |  |

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