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DERIVATIVES - Offsetting (Details) - Not designated as hedging instruments - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Interest rate swap    
DERIVATIVES    
Derivative notional amount $ 449.0 $ 455.8
Interest rate swap - Commercial borrowers    
DERIVATIVES    
Derivative notional amount 224.5 227.9
Interest rate swap - Third party counterparties    
DERIVATIVES    
Derivative notional amount $ 224.5 $ 227.9