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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Long Term Debt Under FHLB of Des Moines (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Long term borrowings $ 156,284 $ 156,102
Federal Home Loan Bank long-term advances    
Debt Instrument [Line Items]    
Long term borrowings 50,000 50,000
Subordinated debentures    
Debt Instrument [Line Items]    
Long term borrowings 51,547 51,547
Subordinated notes, net of unamortized debt issuance costs    
Debt Instrument [Line Items]    
Long term borrowings $ 54,737 $ 54,555