Derivative Financial Instruments - Notional Amounts and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives designated as hedging instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	$ 23,892	$ 41,317
Derivatives designated as hedging instruments | Interest rate swaps | Included in other assets
Notional amounts and fair values of derivatives
Asset Derivatives		31
Derivatives designated as hedging instruments | Interest rate swaps | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(352)	(44)
Derivatives Not Designated as Hedging Instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	2,334,559	2,269,247
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other assets
Notional amounts and fair values of derivatives
Asset Derivatives	29,034	12,305
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(1,897)	(12,007)
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative)
Notional amounts and fair values of derivatives
Notional Amount	64,395	62,039
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(1,839)	(2,607)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
Notional amounts and fair values of derivatives
Notional Amount	2,473	1,191
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts | Included in other assets
Notional amounts and fair values of derivatives
Asset Derivatives	3
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	$ (2)	$ (34)