Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Sales-type lease, interest income	$ 3,200		$ 5,100
Lease renewal term	15 years		15 years
Security deposit	$ 800		$ 800
Letters of credit outstanding, amount	5,500		5,500
Operating lease assets	82,612		82,612		$ 0
Right-of-use asset, adjustment			1,700
Operating lease impairment	0	$ 2,700	1,000	$ 2,700
Radius Bancorp, Inc. Merger
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 5,000		$ 5,000
Minimum
Lessee, Lease, Description [Line Items]
Lease term	1 year		1 year
Sublease term			1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term	10 years		10 years