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DERIVATIVES - Additional Information (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
entity
Dec. 31, 2020
USD ($)
entity
Derivative [Line Items]    
Number of counterparties | entity 20 20
Derivative liabilities $ 226,891 $ 272,606
Derivative, Notional Amount 13,866,596 11,875,690
Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 114,800 112,600
Credit Risk Derivative Liabilities, at Fair Value   $ 2,700
Credit Risk Derivative Assets, at Fair Value $ (600)  
Foreign Exchange [Member]    
Derivative [Line Items]    
Number of counterparties | entity 5 6
Credit Risk Contract [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 250,500 $ 242,400
Credit Risk Derivative Liabilities, at Fair Value 200 300
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 125,200 114,200
Accrued interest and other liabilities | Derivative    
Derivative [Line Items]    
Derivative liabilities 98,900 182,300
Derivative, Notional Amount 2,300,000 2,300,000
Accrued interest and other liabilities | Derivative | Foreign Exchange [Member]    
Derivative [Line Items]    
Derivative liabilities 31,900 33,100
Derivative, Notional Amount $ 4,600,000 $ 3,600,000