Derivative Financial Instruments - Notional Amounts and Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives designated as hedging instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	$ 22,451	$ 23,190
Derivatives designated as hedging instruments | Interest rate swaps | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(1,276)	(682)
Derivatives Not Designated as Hedging Instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	3,002,333	2,818,803
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other assets
Notional amounts and fair values of derivatives
Asset Derivatives	129,888	63,527
Derivatives Not Designated as Hedging Instruments | Interest rate caps and floors
Notional amounts and fair values of derivatives
Notional Amount	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	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	(7)
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative)
Notional amounts and fair values of derivatives
Notional Amount	92,647	82,900
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(4,554)	(4,233)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
Notional amounts and fair values of derivatives
Notional Amount	$ 326	1,428
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts | Included in other assets
Notional amounts and fair values of derivatives
Asset Derivatives		$ 12