Derivative Financial Instruments - Notional Amounts and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Interest rate swaps
Notional amounts and fair values of derivatives
Financial instruments pledged as collateral	$ 1,300	$ 12,100
Cash pledged as collateral	29,900	18,300
Derivatives designated as hedging instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	198,181	200,504
Derivatives designated as hedging instruments | Interest rate swaps | Other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(4,480)	(5,296)
Derivatives Not Designated as Hedging Instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	1,456,427	1,297,101
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other assets
Notional amounts and fair values of derivatives
Asset Derivatives	17,629	15,982
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(19,693)	(18,299)
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative)
Notional amounts and fair values of derivatives
Notional Amount	38,553	37,143
Liability Derivatives	(7,000)	(7,500)
Derivatives Not Designated as Hedging Instruments | Funding Swap (Visa Derivative) | Other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(6,987)	(7,460)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
Notional amounts and fair values of derivatives
Notional Amount	4,911	3,664
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts | Other assets
Notional amounts and fair values of derivatives
Asset Derivatives	78
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts | Other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	$ (20)	$ (147)