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LOANS AND LEASES - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) N | Sep. 30, 2020 USD ($) Loan N | Dec. 31, 2019 USD ($)
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total loans |  | $ 4,430,651,000 | $ 4,430,651,000 | $ 4,394,137,000
Impaired non-accrual loans |  | 8,611,000 | $ 8,611,000 | 28,881,000
Number of commercial loan | Loan |  |  | 1 |
Transfer of commercial loan to held for sale |  |  | $ 10,000,000.0 |
Impaired non-accrual loans performing troubled debt restructured |  | 2,300,000 | 2,300,000 | 2,400,000
Allowance allocated to troubled debt restructured loans |  | 87,000,000,000 | 87,000,000,000 | 2,800,000
Allowance allocated to non accrual loans |  | 41,000 | 41,000 | 2,700,000
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 | N |  | 1 | 3 |
Post-modification outstanding recorded investment |  | $ 341,000 | $ 427,000 |
Loan modifications |  |  | 940,200,000 |
Troubled debt restructurings specific reserves to customers |  | 87,000 | $ 87,000 | 2,800,000
Deferral [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Bank modified loans and contracts | N |  |  | 515 |
Bank modified loans and contracts | N |  |  | 403 |
Post-modification outstanding recorded investment |  |  | $ 827,817,000 |
Deferral [Member] | Loan Level Swaps [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Bank modified loans and contracts | N |  |  | 27 |
Post-modification outstanding recorded investment |  |  | $ 283,600,000 |
Substandard [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Financing receivable impaired loan |  |  | 15,500,000 | 35,900,000
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 |
Minimum [Member] | Deferral [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Deferral of principal and interest periods |  |  | 90 days |
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 |
Maximum [Member] | Deferral [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Deferral of principal and interest periods |  |  | 180 days |
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Impaired non-accrual loans |  | 3,951,000 | $ 3,951,000 | 6,028,000
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Deferral [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Bank modified loans and contracts | N |  |  | 28 |
Post-modification outstanding recorded investment |  |  | $ 28,370,000 |
Commercial Loans Including Equipment Financing [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total loans | [1] | 1,909,724,000 | 1,909,724,000 | $ 1,756,477,000
U.S. Small Business Administration (SBA) Loans [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total loans |  | 202,000,000.0 | 202,000,000.0 |
U.S. Small Business Administration (SBA) Loans [Member] | Commercial Loans Including Equipment Financing [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |
Total loans |  | $ 202,000,000.0 | $ 202,000,000.0 |
[1] | The September 30, 2020 balance includes PPP loans of $202.0 million

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