Derivatives and Hedging Activity - Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	$ 38,029	$ 40,555
Fair Value of Derivatives in a Liability Position	34,805	41,324
Interest rate swaps | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	25,331	33,841
Fair Value of Derivatives in a Liability Position	4	4
Interest Rate Swap Guarantees | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in a Liability Position	498	849
Foreign exchange contracts | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	12,617	6,585
Fair Value of Derivatives in a Liability Position	34,002	39,951
Credit spread instrument | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	81	129
Fair Value of Derivatives in a Liability Position	$ 301	$ 520