Derivative Financial Instruments - Notional Amounts and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives designated as hedging instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	$ 22,451	$ 22,451
Derivatives designated as hedging instruments | Interest rate swaps | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(1,084)	(1,276)
Derivatives Not Designated as Hedging Instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	3,000,461	3,002,333
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other assets
Notional amounts and fair values of derivatives
Asset Derivatives	80,126	129,888
Derivatives Not Designated as Hedging Instruments | Interest rate caps and floors
Notional amounts and fair values of derivatives
Notional Amount	148,800	148,800
Derivatives Not Designated as Hedging Instruments | Interest rate caps and floors | Included in other assets
Notional amounts and fair values of derivatives
Asset Derivatives	56	7
Derivatives Not Designated as Hedging Instruments | Interest rate caps and floors | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(56)	(7)
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative)
Notional amounts and fair values of derivatives
Notional Amount	95,799	92,647
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	$ (3,382)	(4,554)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
Notional amounts and fair values of derivatives
Notional Amount		$ 326