Derivative Instruments and Hedging Activities - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Not Designated as Hedging Instrument
Derivative Asset [Abstract]
Notional Amount	$ 1,248,628	$ 1,248,628	$ 1,167,314
Fair Value	87,733	87,733	114,242
Derivative Liability [Abstract]
Notional Amount	1,233,435	1,233,435	1,145,720
Fair Value	87,504	87,504	113,948
Not Designated as Hedging Instrument | Interest rate swaps
Derivative Asset [Abstract]
Notional Amount	1,188,491	1,188,491	1,102,753
Fair Value	87,483	87,483	113,848
Derivative Liability [Abstract]
Notional Amount	1,188,491	1,188,491	1,102,753
Fair Value	87,483	87,483	113,848
Not Designated as Hedging Instrument | FX forwards
Derivative Asset [Abstract]
Notional Amount	1,036	1,036	9,146
Fair Value	20	20	52
Derivative Liability [Abstract]
Notional Amount	269	269	9,856
Fair Value	3	3	70
Not Designated as Hedging Instrument | RPAs sold
Derivative Asset [Abstract]
Notional Amount	0	0	0
Fair Value	0	0	0
Derivative Liability [Abstract]
Notional Amount	44,675	44,675	33,111
Fair Value	18	18	30
Not Designated as Hedging Instrument | RPAs purchased
Derivative Asset [Abstract]
Notional Amount	59,101	59,101	55,415
Fair Value	230	230	342
Derivative Liability [Abstract]
Notional Amount	0	0	0
Fair Value	0	0	$ 0
Designated as Hedging Instrument | Interest rate swaps
Derivative Asset [Abstract]
Notional Amount	100,000	100,000
Fair Value	342	342
Derivative Liability [Abstract]
Notional Amount	50,000	50,000
Fair Value	764	764
Amount of Gain (Loss) Recognized in OCI on Derivative	4,948	176
Designated as Hedging Instrument | Interest rate swaps | Interest Income
Derivative Liability [Abstract]
Amount of Gain (Loss) Reclassified from OCI into Income	$ 413	$ 599