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FEDERAL HOME LOAN BANK ADVANCES AND SHORT-TERM BORROWINGS - Summary of Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fixed rate      
Outstanding balance $ 711,000 $ 411,000  
Variable rate      
Outstanding balance $ 20,000 $ 70,000  
Weighted average interest rate (percent) 4.59% 0.20%  
Unamortized debt issuance costs $ 3,700 $ 4,900 $ 6,200
Minimum      
Fixed rate      
Interest rate (percent) 0.64% 0.64%  
Maximum      
Fixed rate      
Interest rate (percent) 3.70% 3.32%  
Weighted Average      
Fixed rate      
Interest rate (percent) 2.97% 2.53%