Leases - Net Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lessee, Lease, Description [Line Items]
Net lease costs	$ (3,240)	$ (3,036)	$ (6,680)	$ (6,122)
Variable lease costs	400	300	500	700
Occupancy
Lessee, Lease, Description [Line Items]
Operating lease costs	(4,777)	(4,573)	(9,754)	(9,193)
Other non-interest income
Lessee, Lease, Description [Line Items]
Sublease revenue	$ 1,537	$ 1,537	$ 3,074	$ 3,071