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Derivatives and Hedging Activities - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Derivative
Dec. 31, 2020
USD ($)
Derivative
Aug. 28, 2020
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Termination value of derivatives in net liability position $ 5,900,000    
Collateral posted for derivative instruments $ 10,600,000    
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 6 months    
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 $ 508,200,000 $ 5,000,000.0  
Number of interest rate swaps | Derivative 5 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 $ 2,500,000,000  
Number of interest rate swaps | Derivative 180 176  
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
Net asset fair value     $ 34,100,000
Unrealized gain on terminated interest rate floor remaining in AOCI, pre tax $ 15,900,000 $ 17,000,000.0  
Unrealized gain on terminated interest rate floor remaining in AOCI, net of tax $ 12,000,000.0 $ 12,900,000  
Unrealized gain reclassification to earnings, remaining term 3 years 4 months 24 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