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DERIVATIVES - Additional Information (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
entity
Dec. 31, 2019
USD ($)
entity
Derivative [Line Items]    
Number of counterparties | entity 20 18
Derivative Asset $ 272,499 $ 112,607
Derivative Assets (Liabilities), at Fair Value, Net (107)  
Derivative Liability 272,606 112,616
Derivative, Notional Amount $ 11,875,690 $ 7,586,618
Foreign Exchange [Member]    
Derivative [Line Items]    
Number of counterparties | entity 6 6
Credit Risk Contract [Member]    
Derivative [Line Items]    
Outstanding liability from counterparty contracts $ 300 $ 200
Derivative, Notional Amount 242,400 216,200
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Derivative, Notional Amount 114,200 33,400
Other Credit Derivatives [Member]    
Derivative [Line Items]    
Outstanding liability from counterparty contracts   900
Derivative, Notional Amount 112,600 37,800
Credit Risk Derivative Assets, at Fair Value 2,700  
Derivative [Member] | Other Liabilities [Member]    
Derivative [Line Items]    
Derivative Liability 182,300 67,500
Derivative, Notional Amount 2,300,000 1,900,000
Derivative [Member] | Other Liabilities [Member] | Foreign Exchange [Member]    
Derivative [Line Items]    
Derivative Liability 33,100 18,300
Derivative, Notional Amount $ 3,600,000 $ 1,900,000