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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	$ (111)	$ (307)	$ (1,265)	$ 1,941
Interest rate swap contracts—commercial loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	22	(537)	337	(485)
Interest rate lock commitments—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	192	86	712	2,877
Forward sale contracts—mortgage loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives (Loss)/Gain	$ (325)	$ 144	$ (2,314)	$ (451)