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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Gain (Loss) on Securities [Line Items]          
Proceeds from Sale of Debt Securities, Available-for-sale     $ 375,276 $ 122,248 $ 519,136
Debt Securities, Available-for-sale, Realized Gain     6,800 900 2,100
Debt Securities, Available-for-sale, Realized Loss     7,600 800 2,100
Available For Sale Securities Net Realized Gain Loss Tax Provision     (173) 19 (7)
Securities transferred from HTM to AFS   $ 268,700 0 0 $ 268,703
Realized gain (loss) on debt securities transferred from HTM to AFS $ 200        
Pledged Financial Instruments, Not Separately Reported, Securities     1,500,000 1,511,322  
Debt Securities, Held-to-maturity, Allowance for Credit Loss     $ 0 $ 0  
NumberOfSecuritiesInSecurityPortfolio     1,418 1,351  
NumberOfSecuritiesInUnrealizedLossPosition     327 94  
Debt Securities, Held-to-maturity, Nonaccrual     $ 0 $ 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss     (485) 0  
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale       117,800  
Other securities          
Gain (Loss) on Securities [Line Items]          
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss     $ (485) $ 0