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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Notional amount $ 3,843,761,000 $ 4,070,729,000
Cash collateral pledged 77,100,000  
Amortized cost of securities pledged as collateral to derivative counterparties 38,600,000  
Fair value of securities as pledged collateral to derivative counterparties 38,900,000  
Commercial counterparties    
Derivative [Line Items]    
Net asset position 1,100,000 600,000
Interest rate swaps    
Derivative [Line Items]    
Notional amount 9,400,000  
Cash collateral pledged 77,075,000 96,310,000
Interest rate swaps | Commercial counterparties    
Derivative [Line Items]    
Cash collateral pledged 0 0
Net asset position 177,700,000 76,400,000
Derivative liability, amount offset against collateral 0 1,100,000
Interest rate swaps | Institutional counterparties    
Derivative [Line Items]    
Cash collateral pledged 77,075,000 96,310,000
Derivative liability, amount offset against collateral 74,800,000 78,800,000
Not Designated as Hedging Instrument    
Derivative [Line Items]    
Notional amount 75,090,000 $ 168,997,000
Economic hedges    
Derivative [Line Items]    
Notional amount 3,800,000,000  
Credit valuation adjustments $ 2,000,000.0  
Economic hedges | Interest rate swap on tax advantaged economic development bond    
Derivative [Line Items]    
Fixed rate of interest 5.09%  
Maturity period 21 years  
Economic hedges | Interest rate swaps    
Derivative [Line Items]    
Notional amount $ 3,400,000,000  
Economic hedges | Risk participation agreements with dealer banks    
Derivative [Line Items]    
Notional amount 300,000,000  
Economic hedges | Forward sale commitments    
Derivative [Line Items]    
Notional amount $ 17,600,000