Derivative Financial Instruments - Notional Amounts and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivatives designated as hedging instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	$ 22,825	$ 23,190
Derivatives designated as hedging instruments | Interest rate swaps | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(1,423)	(682)
Derivatives Not Designated as Hedging Instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	2,976,810	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	159,873	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	11
Derivatives Not Designated as Hedging Instruments | Interest rate caps and floors | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(11)
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative)
Notional amounts and fair values of derivatives
Notional Amount	91,410	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	(920)	(4,233)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
Notional amounts and fair values of derivatives
Notional Amount	$ 113	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