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FEDERAL HOME LOAN BANK ADVANCES AND SHORT-TERM BORROWINGS - Financial Data of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Banks [Abstract]      
Weighted-average interest rate at end of year (percent) 2.19% 2.15% 2.27%
Average interest rate during the year (percent) 2.82% 2.41% 2.55%
Average balance $ 426,875 $ 749,195 $ 1,264,945
Maximum amount outstanding at any month-end 641,000 1,210,000 1,850,000
Balance at end of year $ 481,000 $ 546,000 $ 1,195,000