Derivative Financial Instruments - Notional Amounts and Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives designated as hedging instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	$ 22,066	$ 22,451
Derivatives designated as hedging instruments | Interest rate swaps | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(852)	(1,276)
Derivatives Not Designated as Hedging Instruments | Interest rate swaps
Notional amounts and fair values of derivatives
Notional Amount	2,962,557	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	68,046	129,888
Derivatives Not Designated as Hedging Instruments | Visa Derivative
Notional amounts and fair values of derivatives
Notional Amount	102,430	92,647
Derivatives Not Designated as Hedging Instruments | Visa Derivative | Included in other liabilities
Notional amounts and fair values of derivatives
Liability Derivatives	(852)	(4,554)
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	4	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	(4)	(7)
Derivatives Not Designated as Hedging Instruments | Foreign exchange contracts
Notional amounts and fair values of derivatives
Notional Amount	$ 992	$ 326