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Derivatives and Hedging Activities - Additional Information (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Derivative
Dec. 31, 2021
USD ($)
Derivative
Aug. 28, 2020
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Hedging adjustments amortized through contractual maturity date in connection with terminated hedge $ 26,800,000    
Termination value of derivatives in net liability position 0    
Collateral posted for derivative instruments $ 0    
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 14 years    
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 $ 607,600,000 $ 1,000,000,000.0  
Number of interest rate swaps | Derivative 7 10  
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 $ 841,000    
Interest Rate Swap [Member] | Derivatives not Designated as Hedging Instruments [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, notional amount $ 3,500,000,000 $ 2,900,000,000  
Number of interest rate swaps | Derivative 220 188  
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 $ 8,600,000 $ 12,300,000  
Unrealized gain on terminated interest rate floor remaining in AOCI, net of tax $ 6,500,000 $ 9,400,000  
Unrealized gain reclassification to earnings, remaining term 1 year 10 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 $ 4,900,000