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ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Additional Information (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
borrower
Mar. 31, 2020
USD ($)
loan
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Troubled Debt Restructuring        
Loans Modified In Troubled Debt Restructured Loans $ 122,000      
Charge-offs recorded for new troubled debt restructurings 666,000      
Financing receivable, loan portfolio, deferrals, COVID-19 $ 85,000,000.0      
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower 26      
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent) 2.00%      
Valuation allowance $ 71,844,000 $ 53,609,000 $ 61,408,000 $ 50,652,000
Loan amount of credit quality analysis 250,000      
Loans 4,474,631,000   4,649,156,000  
Pass        
Troubled Debt Restructuring        
Loans     3,997,245,000  
All Modifications [Member]        
Troubled Debt Restructuring        
Number of Loans | loan   1    
Commercial and industrial loans        
Troubled Debt Restructuring        
Valuation allowance 32,052,000 $ 24,739,000 28,333,000 25,789,000
Loans     1,784,926,000  
Commercial and industrial loans | Non-working capital loans        
Troubled Debt Restructuring        
Loans 1,093,471,000   1,158,827,000  
Commercial and industrial loans | Non-working capital loans | Pass        
Troubled Debt Restructuring        
Loans 1,043,276,000   1,111,989,000  
Commercial real estate and multi-family residential loans        
Troubled Debt Restructuring        
Valuation allowance 29,445,000 18,658,000 22,907,000 15,796,000
Loans     1,892,572,000  
Agri-business and agricultural loans        
Troubled Debt Restructuring        
Valuation allowance 3,901,000 3,704,000 3,043,000 3,869,000
Loans     429,662,000  
Consumer 1-4 family loans        
Troubled Debt Restructuring        
Valuation allowance 3,384,000 $ 2,475,000 2,619,000 $ 2,086,000
Loans     344,699,000  
Commercial loan        
Troubled Debt Restructuring        
Financing receivable, loan portfolio, deferrals, COVID-19 $ 84,400,000      
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower 19      
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent) 2.00%      
Loans under first deferral action $ 14,500,000      
Loans under second deferral action 14,900,000      
Loans under third deferral action 30,500,000      
Loans under fourth deferral action $ 24,500,000      
Borrowers percentage 89      
Consumer Loan Member        
Troubled Debt Restructuring        
Loans Modified In Troubled Debt Restructured Loans $ 6,100,000   $ 5,500,000  
Financing receivable, loan portfolio, deferrals, COVID-19 $ 600,000      
Financing receivable, loan portfolio, deferrals, COVID-19, borrowers | borrower 7      
Financing receivable, loan portfolio, deferrals, COVID-19, percentage of loan portfolio (as a percent) 0.20%      
PPP | Pass        
Troubled Debt Restructuring        
Loans $ 396,700,000