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LOANS AND LEASES - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) Contract | Sep. 30, 2020 Contract | Sep. 30, 2021 USD ($) Contract | Sep. 30, 2020 USD ($) Contract | Dec. 31, 2020 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Impaired non-accrual loans | $ 25,925,000 |  | $ 25,925,000 |  | $ 11,410,000
Impaired loans balance | 21,023,000 |  | 21,023,000 |  | 5,162,000
Specific reserves | 7,217,000 |  | 7,217,000 |  | 2,703,000
Impaired non-accrual loans performing troubled debt restructured | 416,000 |  | 416,000 |  | 201,000
Allowance allocated to troubled debt restructured loans | 57,000 |  | 57,000 |  | 3,000
Allowance allocated to non accrual loans | 0 |  | 0 |  |
Loan receivable, validate risk ratings performed for large sample or new lending to existing relationships | 1,000,000 |  | 1,000,000 |  |
Loan receivable, validate risk ratings performed for criticized and classified rated borrowers with relationship exposure, value | 500,000 |  | 500,000 |  |
Loan receivable, validate risk ratings performed for new regulation "O" loan commitments, value | 1,000,000 |  | 1,000,000 |  |
Loan receivable validate risk ratings performed for leveraged loans, value | 1,000,000 |  | 1,000,000 |  |
Loan receivable validate risk ratings performed for no borrower with commitments, value | $ 500,000 |  | $ 500,000 |  |
Bank modified loans and contracts | Contract | 2 | 0 | 4 | 3 |
Post-modification outstanding recorded investment | $ 455,000 |  | $ 3,471,000 | $ 427,000 |
Loan modifications |  |  | 947,000,000.0 |  |
Loan individually evaluated for impairment | 26,341,000 |  | 26,341,000 |  | 16,204,000
Troubled debt restructurings specific reserves | $ 57,000 |  | $ 57,000 |  | 3,000
Number of Loans | Contract | 2 | 0 | 4 | 3 |
Deferral [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Bank modified loans and contracts | Contract |  |  | 542 |  |
Bank modified loans and contracts | Contract |  |  | 8 |  |
Post-modification outstanding recorded investment |  |  | $ 33,074,000 |  |
Number of Loans | Contract |  |  | 8 |  |
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 |  |
Number of Loans | Contract |  |  | 1 |  |
Substandard [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Financing receivable impaired loan |  |  | $ 26,300,000 |  | 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 |  | 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 |  | 1,000,000 |  |
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Impaired non-accrual loans | 19,887,000 |  | 19,887,000 |  |
Impaired loans balance | 19,887,000 |  | 19,887,000 |  |
Specific reserves | 7,137,000 |  | 7,137,000 |  |
Loan individually evaluated for impairment | $ 19,887,000 |  | $ 19,887,000 |  | $ 4,593,000
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member] | Deferral [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Bank modified loans and contracts | Contract |  |  | 1 |  |
Post-modification outstanding recorded investment |  |  | $ 19,887,000 |  |
Number of Loans | Contract |  |  | 1 |  |
Commercial Real Estate Portfolio Segment [Member] | Investment Property [Member] | Substandard [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Financing Receivable increase in impaired loan |  |  | $ 19,900,000 |  |

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