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LOANS AND LEASES - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable Recorded Investment Past Due [Line Items]    
Impaired non-accrual loans $ 29,324,000 $ 28,881,000
Impaired non-accrual loans performing troubled debt restructured 2,400,000 2,400,000
Allowance allocated to troubled debt restructured loans 6,300,000 2,800,000
Allowance allocated to non accrual loans 58,000 2,700,000
Loan receivable, validate risk ratings performed for 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 random sample of borrowers with relationship, value 1,000,000  
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 250,000  
Troubled debt restructurings specific reserves to customers 6,300,000 2,800,000
Substandard [Member]    
Financing Receivable Recorded Investment Past Due [Line Items]    
Financing receivable impaired loan $ 36,400,000 $ 35,900,000