Derivative and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019	Dec. 31, 2019
Interest Income (Expense), Net	$ 244,467		$ 241,325
Gain (loss) on interest rate cash flow hedge ineffectiveness	(645,000)
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net	831,000,000
Designated as Hedging Instrument [Member]
Derivative, Notional Amount	2,000,000			$ 2,000,000
Interest Income (Expense), Net	3,900		$ 239,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative, Notional Amount	2,250,000			800,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative, Notional Amount	2,000,000			2,000,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | LCH
Derivative, Notional Amount	4,300,000
Loans and leases
Amortized Cost	4,300,000			4,500,000
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of the Hedged Assets	$ 81,613	[1]		$ 53,483	[2]

[1] These amounts include the amortized cost basis of closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At March 31, 2020, the amortized cost basis of the closed portfolios used in these hedging relationships was $4.3 billion; the cumulative basis adjustments associated with these hedging relationships was $81.6 million; and the amount of the designated hedged items was $2.0 billion.

[2] These amounts include the amortized cost basis of closed portfolios used to designate hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At December 31, 2019, the amortized cost basis of the closed portfolios used in these hedging relationships was $4.5 billion; the cumulative basis adjustments associated with these hedging relationships was $53.5 million; and the amount of the designated hedged items was $2.0 billion.