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DEPOSITS - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Time deposits of $250,000 or more $ 423.6 $ 235.8
Brokered deposits 846.7 228.6
Related party deposit liabilities $ 8.0 $ 6.2