Leases - Schedule of Components of Lease Expense and Other lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 1,326	$ 1,364	$ 4,005	$ 4,140
Variable lease cost	348	338	1,090	1,014
Sublease income	(123)	(96)	(369)	(139)
Total lease cost	1,551	1,606	4,726	5,015
Cash paid for amounts included in measurement of lease liabilities
Operating cash outflows from operating leases	1,490	1,480	4,455	4,470
ROU assets obtained in exchange for new operating lease liabilities	4,434		4,699	15
Reduction to ROU assets resulting from reduction to lease liabilities		$ 18	1,250	18
Other non-cash reductions to ROU assets	48		48	$ 1,192
Operating lease ROU assets	$ 15,882		$ 15,882		$ 16,200
Operating Lease, Right-of-Use Asset, Statement of Financial Position	Other assets		Other assets		Other assets
Operating lease liabilities	$ 18,148		$ 18,148		$ 19,072
Operating Lease, Liability, Statement of Financial Position	Other liabilities		Other liabilities		Other liabilities
Weighted-average remaining lease term - operating leases	4 years 6 months 29 days		4 years 6 months 29 days		3 years 10 months 13 days
Weighted-average discount rate - operating leases	2.05%		2.05%		2.32%