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BORROWINGS - Schedule of Short-term Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Short-term Debt [Line Items] |  |  |
Short-term Debt | $ 296,203 | $ 166,594 | $ 1,316,181
Short-term debt interest rate | 0.27% | 0.05% | 1.62%
Short-term debt, average for the year | $ 204,503 | $ 590,903 | $ 1,146,719
Short-term debt, average rate (as a percent) | 0.10% | 1.09% | 1.90%
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt | $ 51,203 | $ 166,594 | $ 165,181
Short-term debt interest rate | 0.01% | 0.05% | 0.85%
Short-term debt, average for the year | $ 160,967 | $ 149,036 | $ 155,859
Short-term debt, average rate (as a percent) | 0.07% | 0.26% | 1.15%
Federal Home Loan Bank Borrowings [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt | $ 225,000 | $ 0 | $ 1,151,000
Short-term debt interest rate | 0.18% | 0.00% | 1.73%
Short-term debt, average for the year | $ 43,371 | $ 441,867 | $ 990,860
Short-term debt, average rate (as a percent) | 0.20% | 1.37% | 2.37%
Short-term Debt |  |  |
Short-term Debt [Line Items] |  |  |
Short-term Debt | $ 20,000 | $ 0 | $ 0
Short-term debt interest rate | 1.90% | 0.00% | 0.00%
Short-term debt, average for the year | $ 165 | $ 0 | $ 0
Short-term debt, average rate (as a percent) | 1.92% | 0.00% | 0.00%

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