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LOANS AND LEASES - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Contract | Mar. 31, 2020 USD ($) Contract | Dec. 31, 2020 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Impaired non-accrual loans | $ 11,767,000 |  | $ 11,410,000
Impaired non-accrual loans performing troubled debt restructured | 197,000 |  | 201,000
Allowance allocated to troubled debt restructured loans | 1,000 |  | 3,000
Allowance allocated to non accrual loans | 0 |  |
Loan receivable, validate risk ratings performed for large sample or new lending to existing relationships | 1,000,000 |  |
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value | 500,000 |  |
Loan receivable, validate risk ratings performed for new regulation "O" loan commitments, value | 1,000,000 |  |
Loan receivable validate risk ratings performed for leveraged loans, value | 1,000,000 |  |
Loan receivable validate risk ratings performed for no borrower with commitments, value | 500,000 |  |
Bank modified loans and contracts | Contract |  | 2 |
Post-modification outstanding recorded investment |  | $ 301,000 |
Loan modifications | 946,700,000 |  |
Troubled debt restructurings specific reserves | $ 1,000 |  | 3,000
Deferral [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Bank modified loans and contracts | Contract | 540 |  |
Bank modified loans and contracts | Contract | 32 |  |
Post-modification outstanding recorded investment | $ 42,757,000 |  |
Deferral [Member] | Loan Level Swaps [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Bank modified loans and contracts | Contract | 1 |  |
Post-modification outstanding recorded investment | $ 19,900,000 |  |
Substandard [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Financing receivable impaired loan | 12,000,000.0 |  | $ 16,200,000
Minimum [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loan receivable, validate risk ratings performed for large sample of borrowers with relationship, value | 1,000,000 |  |
Maximum [Member] |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |
Loan receivable, validate risk ratings performed for small sample of borrowers with relationship, value | $ 1,000,000 |  |

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- Definition Allowance on troubled debt restructured loans in financing receivables. + References No definition available. + Details
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