Operating Leases (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021 USD ($) Property Lease	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Property Lease	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Leases, operating [Abstract]
Number of lease for which construction not started | Lease		1		1
Other information related to leases [Abstract]
Operating lease cost		$ 2,010	$ 1,966	$ 6,029	$ 5,893
Variable lease cost		499	369	1,508	1,524
Total Lease costs		$ 2,509	$ 2,335	7,537	7,417
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases				6,121	6,022
Right-of-use assets obtained in exchange for lease obligations:				$ 2,696	$ 287
Weighted average remaining lease term		8 years 8 months 12 days	8 years 10 months 24 days	8 years 8 months 12 days	8 years 10 months 24 days
Weighted average discount rate		3.07%	3.25%	3.07%	3.25%
Future minimum lease payments under non-cancellable leases [Abstract]
2021	[1]	$ 2,072		$ 2,072
2022		8,014		8,014
2023		7,719		7,719
2024		7,595		7,595
2025		7,223		7,223
Thereafter		25,291		25,291
Total lease payments		57,914		57,914
Less: Interest		7,399		7,399
Present value of lease liabilities		50,515		50,515		$ 52,784
Director [Member]
Future minimum lease payments under non-cancellable leases [Abstract]
Total lease payments		3,700		3,700
Less: Interest		$ 525		$ 525
Number of Properties Under Lease Owned by Related Party | Property		5		5
Minimum [Member]
Leases, operating [Abstract]
Operating lease expiration term		5 months		5 months
Maximum [Member]
Leases, operating [Abstract]
Operating lease expiration term		23 years		23 years

[1] Excluding the nine months ended September 30, 2021.