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BORROWINGS - Schedule of Short-term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]      
Short-term Debt $ 166,594 $ 1,316,181 $ 1,040,691
Short-term debt interest rate 0.05% 1.62% 2.33%
Short-term debt, average for the year $ 590,903 $ 1,146,719 $ 947,427
Short-term debt, average rate (as a percent) 1.09% 1.90% 1.90%
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]      
Short-term Debt [Line Items]      
Short-term Debt $ 166,594 $ 165,181 $ 183,591
Short-term debt interest rate 0.05% 0.85% 1.65%
Short-term debt, average for the year $ 149,036 $ 155,859 $ 87,221
Short-term debt, average rate (as a percent) 0.26% 1.15% 0.58%
Short-term debt, maximum month-end balances $ 260,621 $ 260,621 $ 183,591
Federal Home Loan Bank Borrowings [Member]      
Short-term Debt [Line Items]      
Short-term Debt $ 0 $ 1,151,000 $ 857,100
Short-term debt interest rate 0.00% 1.73% 2.48%
Short-term debt, average for the year $ 441,867 $ 990,860 $ 857,028
Short-term debt, average rate (as a percent) 1.37% 2.37% 2.03%
Short-term debt, maximum month-end balances $ 1,171,400 $ 1,171,400 $ 1,170,800
Short-term Debt      
Short-term Debt [Line Items]      
Short-term debt, average for the year $ 0 $ 0 $ 3,178
Short-term debt, average rate (as a percent) 0.00% 0.00% 4.36%
Short-term debt, maximum month-end balances $ 0 $ 0 $ 10,000