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DERIVATIVES - Additional Information (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
entity
Dec. 31, 2019
USD ($)
entity
Derivative [Line Items]    
Number of counterparties | entity 19 18
Derivative liabilities $ 308,888 $ 112,616
Derivative, Notional Amount 8,402,376 7,586,618
Other Credit Derivatives [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 147,000 37,800
Credit Risk Derivative Liabilities, at Fair Value   $ 900
Credit Risk Derivative Assets, at Fair Value $ (1,800)  
Foreign Exchange [Member]    
Derivative [Line Items]    
Number of counterparties | entity 6 6
Credit Risk Contract [Member]    
Derivative [Line Items]    
Derivative, Notional Amount $ 234,000 $ 216,200
Credit Risk Derivative Liabilities, at Fair Value 400 200
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 189,500 33,400
Accrued interest and other liabilities | Derivative    
Derivative [Line Items]    
Derivative liabilities 191,000 67,500
Derivative, Notional Amount 2,100,000 1,900,000
Accrued interest and other liabilities | Derivative | Foreign Exchange [Member]    
Derivative [Line Items]    
Derivative liabilities 19,800 18,300
Derivative, Notional Amount $ 2,100,000 $ 1,900,000