Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	$ 6,589,856	$ 8,557,883
Trading
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	1,235,713	2,693,364
Cash Flow | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	1,438,144	1,018,976
Fair Value | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	3,915,999	4,845,543
Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	5,536,096	8,557,883
Interest Rate Swaps | Trading
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	181,953	2,693,364
Interest Rate Swaps | Cash Flow | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	1,438,144	1,018,976
Interest Rate Swaps | Fair Value | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	3,915,999	4,845,543
Other
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	1,053,760	0
Other | Trading
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	1,053,760	0
Other | Cash Flow | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	0	0
Other | Fair Value | Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Notional Values	$ 0	$ 0