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INVESTMENT SECURITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]          
Trading gain (losses) recorded in servicing income $ (2.6)   $ (6.4)    
Tax exempt interest income on available-for-sale securities $ 3.1 $ 2.6 $ 8.9 $ 7.6  
Mortgage Backed Securities and Collateralized Mortgage Obligations          
Debt Securities, Available-for-sale [Line Items]          
Weighted average yield 2.78%   2.78%   1.82%
US Treasury Notes Securities | Not Designated as Hedging Instrument, Economic Hedge          
Debt Securities, Available-for-sale [Line Items]          
Trading securities $ 21.1   $ 21.1    
Unrealized gain (loss) on trading securities     $ 2.0