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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Gain (Loss) on Securities [Line Items]          
Proceeds from Sale of Debt Securities, Available-for-sale     $ 117,800 $ 519,100 $ 290,700
Available-for-sale Securities, Gross Realized Gains     900 2,100 500
Available-for-sale Securities, Gross Realized Losses     800 2,100 600
Available For Sale Securities Net Realized Gain Loss Tax Provision     19 (7) 37
Securities transferred from HTM to AFS $ 268,700 $ 372,100 0 268,703 $ 372,128
Realized gain (loss) on debt securities transferred from HTM to AFS $ 200        
Pledged Financial Instruments, Not Separately Reported, Securities     $ 1,500,000 $ 1,100,000  
NumberOfSecuritiesInSecurityPortfolio     1,351 1,273  
NumberOfSecuritiesInUnrealizedLossPosition     94 140  
Debt Securities, Held-to-maturity, Allowance for Credit Loss     $ 0    
Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized in Earnings       $ 0