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Derivatives and Hedging Activities - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Derivative
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Derivative
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Termination value of derivatives in net liability position $ 0   $ 0    
Collateral posted for derivative instruments 0   $ 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     12 years 2 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]          
Unrealized gain on terminated fair value hedges in AOCI     $ 52,100,000   $ 55,000,000
Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Increase To Interest Income [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Fair value hedges reclassification from AOCI to interest 1,200,000 $ 1,200,000 3,800,000 $ 2,200,000  
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   $ 51,500,000
Number of interest rate swaps | Derivative 2   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 $ 1,200,000   $ 1,200,000    
Interest Rate Swap [Member] | Derivatives not Designated as Hedging Instruments [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, notional amount $ 5,000,000,000   $ 5,000,000,000   $ 4,300,000,000
Number of interest rate swaps | Derivative 276   276   258
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 $ 2,000,000,000   $ 2,000,000,000   $ 1,000,000,000
Number of interest rate swaps | Derivative 8   8   3
Unrealized gain on terminated interest rate floor remaining in AOCI, pre tax     $ 489,000    
Unrealized gain on terminated interest rate floor remaining in AOCI, net of tax         $ 2,000,000
Interest Rate Floor [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member] | Increase To Interest Income [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Reclassification from AOCI to interest $ 6,700,000   $ 6,700,000