Derivatives (Derivatives Not Designated as Hedging Instruments - Credit Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative assets - Fair value	$ 689,100	$ 484,184
Derivative liabilities - Fair value	692,029	390,171
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	20,259,808	19,522,661
Derivative assets - Fair value	688,715	484,184
Derivative liabilities - Fair value	691,539	389,889
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives
Derivative [Line Items]
Notional Amount	122,560	72,560
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	67	141
Credit contracts | Derivatives not designated as hedging instruments | Other credit derivatives | RPAs — protection sold
Derivative [Line Items]
Notional Amount	122,560	72,560
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	$ 67	$ 141