Derivative Financial Instruments - Free-Standing (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Minimum
Derivative financial instruments
Derivative, Floating rate					4.62%
Maximum
Derivative financial instruments
Derivative, Floating rate					7.12%
Derivatives Not Designated as Hedging Instruments | Interest rate swaps
Derivative financial instruments
Notional Amount	$ 2,811,284,000		$ 2,811,284,000		$ 2,849,776,000
Positive fair value, derivative asset	3,073,000		3,073,000		3,178,000
Negative fair value, derivative liability	1,198,000		1,198,000		$ 42,365,000
Net interest expense	$ 0	$ 0	$ 0	$ 0
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Minimum
Derivative financial instruments
Derivative, Floating rate	5.82%		5.82%
Fixed interest rate (as a percent)	2.39%		2.39%		2.39%
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Maximum
Derivative financial instruments
Derivative, Floating rate	8.33%		8.33%
Fixed interest rate (as a percent)	5.86%		5.86%		6.13%
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Customer swap program
Derivative financial instruments
Notional Amount	$ 2,800,000,000		$ 2,800,000,000		$ 2,800,000,000
Positive fair value, derivative asset	3,100,000		3,100,000		3,200,000
Negative fair value, derivative liability	1,200,000		1,200,000		$ 42,400,000
Upfront fees on the dealer swap	$ 0	$ 400,000	$ 1,500,000	$ 1,800,000