Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	$ (470)	$ 1,427
Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	310	114
Interest rate lock commitments—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	(1,759)	2,606
Forward sale contracts—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	$ 979	$ (1,293)