Derivative Instruments and Hedging Activities - Fair Value Hedge Derivatives (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative basis adjustments, reduction of the amortized cost basis of the close portfolios	$ 47,000	$ 19,000
Debt Securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amortized cost of hedged AFS securities	8,747,000	8,765,000
Cumulative fair value hedging adjustment included in the amortized cost of hedged AFS securities	(242,000)	(85,000)
Amortized cost basis of closed portfolio hedges	2,100,000	2,100,000
Amount of designated hedged items of closed portfolio hedges	1,600,000	1,600,000
Cumulative basis adjustments, reduction of the amortized cost basis of the close portfolios	47,000	19,000
Debt Securities | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cumulative fair value hedging adjustments related to securities which hedge accounting has been discontinued, reduction of the the amortized cost basis	$ 500	$ 500