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DEPOSITS - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Time deposits of $250,000 or more $ 702.3 $ 423.6
Brokered deposits 452.7 846.7
Related party deposit liabilities $ 118.5 $ 8.0