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Derivatives and Hedging Activities - Additional Information (Detail)
12 Months Ended
Dec. 31, 2020
USD ($)
Derivative
Aug. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Termination value of derivatives in net liability position $ 9,200,000    
Collateral posted for derivative instruments $ 12,400,000    
Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Interest rate hedging exposure to variability in future cash flows for forecasted transactions, maximum period 15 years 8 months 12 days    
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, notional amount $ 5,000,000.0   $ 5,300,000
Number of interest rate swaps | Derivative 1   1
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, notional amount $ 51,500,000   $ 51,500,000
Number of interest rate swaps | Derivative 2   2
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Reclassification from AOCI to interest $ 1,300,000    
Interest Rate Swap [Member] | Derivatives not Designated as Hedging Instruments [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, notional amount $ 2,500,000,000   $ 1,900,000,000
Number of interest rate swaps | Derivative 176   142
Interest Rate Floor [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, notional amount $ 750,000,000.0    
Number of interest rate swaps | Derivative 1    
Net asset fair value   $ 34,100,000  
Unrealized gain on terminated interest rate floor remaining in AOCI, pre tax $ 17,000,000.0    
Unrealized gain on terminated interest rate floor remaining in AOCI, net of tax $ 12,900,000    
Unrealized gain reclassification to earnings, remaining term 3 years 8 months 12 days    
Interest rate floor termination date Aug. 28, 2020    
Interest Rate Floor [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Reduction To Interest Income [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Reclassification from AOCI to interest $ 4,700,000