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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Federal Home Loan Banks [Abstract]      
Weighted-average interest rate at end of year (percent) 3.02% 2.19% 2.15%
Average interest rate during the year (percent) 2.87% 2.82% 2.41%
Average balance $ 528,590 $ 426,875 $ 749,195
Maximum amount outstanding at any month-end 771,000 641,000 1,210,000
Balance at end of year 731,000 481,000 546,000
Unamortized debt issuance costs $ (3,700) $ (4,900) $ (6,200)