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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