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LOANS (Loans by credit quality indicator narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]                
Held to maturity $ 10,012,014,000   $ 10,012,014,000     $ 10,023,051,000    
Allowance for credit loss 120,726,000 $ 119,937,000 120,726,000 $ 119,937,000 $ 130,172,000 $ 131,606,000 $ 97,350,000 $ 70,395,000
Loans secured by residential real estate property in process of foreclosure $ 1,700,000   $ 1,700,000          
Loans delinquent 30 to 89 days, percentage 0.17%   0.17%     0.23%    
Interest income on nonaccrual loans $ 0 $ 0 $ 0 $ 0        
Nonaccrual loans with no related allowance 24,000,000.0   24,000,000.0     $ 32,500,000    
Nonpass | Paycheck Protection Program ("PPP")                
Financing Receivable, Credit Quality Indicator [Line Items]                
Held to maturity 91,800,000   91,800,000     $ 77,100,000    
Allowance for credit loss $ 0   $ 0