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FEDERAL HOME LOAN BANK ADVANCES (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Advance from Federal Home Loan Bank      
Federal Home Loan Bank advances $ 85,790   $ 85,790
Federal Home Loan Bank of Chicago      
Advance from Federal Home Loan Bank      
FHLB program, admitted assets, actual 3,000,000   3,000,000
FHLB program, maximum borrowing capacity 759,000   759,000
Federal Home Loan Bank advances 86,000   86,000
Interest expense on FHLB borrowings 1,000 $ 1,000  
FHLB program, investments pledged as security $ 90,000   $ 95,000
Federal Home Loan Bank of Chicago | Minimum      
Advance from Federal Home Loan Bank      
FHLB advances, interest rate (as a percent) 5.60%   5.60%
Federal Home Loan Bank of Chicago | Maximum      
Advance from Federal Home Loan Bank      
FHLB advances, interest rate (as a percent) 5.70%   5.90%