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BORROWINGS - Schedule of Short-term Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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