Derivatives and Hedging Activity - Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	$ 40,555	$ 28,943
Fair Value of Derivatives in a Liability Position	41,324	8,740
Interest rate swaps | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	33,841	14,385
Fair Value of Derivatives in a Liability Position	4
Interest Rate Swap Guarantees | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in a Liability Position	849	614
Foreign exchange contracts | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	6,585	14,558
Fair Value of Derivatives in a Liability Position	39,951	7,834
Credit spread instrument | Derivatives not designated as hedging instruments
Fair value of derivative instruments
Fair Value of Derivatives in an Asset Position	129
Fair Value of Derivatives in a Liability Position	$ 520	$ 292