Operating Leases (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2021 USD ($) Lease Property	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Leases, operating [Abstract]
Number of lease for which construction not started | Lease		1
Other information related to leases [Abstract]
Operating lease cost		$ 2,016	$ 1,995
Variable lease cost		502	480
Total Lease costs		2,518	2,475
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases		2,038	1,995
Right-of-use assets obtained in exchange for lease obligations:		$ 302	$ 0
Weighted average remaining lease term		8 years 10 months 24 days	9 years 2 months 12 days
Weighted average discount rate		3.16%	3.25%
Future minimum lease payments under non-cancellable leases [Abstract]
2021	[1]	$ 6,155
2022		7,780
2023		7,475
2024		7,350
2025		6,976
Thereafter		23,660
Total lease payments		59,396
Less: Interest		7,947
Present value of lease liabilities		51,449		$ 52,784
Director [Member]
Future minimum lease payments under non-cancellable leases [Abstract]
Total lease payments		4,400
Less: Interest		$ 620
Number of Properties Under Lease Owned by Related Party | Property		6
Minimum [Member]
Leases, operating [Abstract]
Operating lease expiration term		6 months
Maximum [Member]
Leases, operating [Abstract]
Operating lease expiration term		23 years 6 months

[1] Excluding three months ended March 31, 2021.