Operating Leases (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021 USD ($) Property	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Property	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Other information related to leases [Abstract]
Operating lease cost		$ 2,003	$ 1,932	$ 4,019	$ 3,927
Variable lease cost		507	675	1,009	1,155
Total Lease costs		$ 2,510	$ 2,607	5,028	5,082
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases				4,074	4,010
Right-of-use assets obtained in exchange for lease obligations:				$ 1,107	$ 287
Weighted average remaining lease term		8 years 10 months 24 days	9 years	8 years 10 months 24 days	9 years
Weighted average discount rate		3.13%	3.25%	3.13%	3.25%
Future minimum lease payments under non-cancellable leases [Abstract]
2021	[1]	$ 4,092		$ 4,092
2022		7,780		7,780
2023		7,475		7,475
2024		7,350		7,350
2025		6,976		6,976
Thereafter		24,616		24,616
Total lease payments		58,289		58,289
Less: Interest		7,703		7,703
Present value of lease liabilities		50,586		50,586		$ 52,784
Director [Member]
Future minimum lease payments under non-cancellable leases [Abstract]
Total lease payments		3,800		3,800
Less: Interest		$ 552		$ 552
Number of Properties Under Lease Owned by Related Party | Property		5		5
Minimum [Member]
Leases, operating [Abstract]
Operating lease expiration term		6 months		6 months
Maximum [Member]
Leases, operating [Abstract]
Operating lease expiration term		23 years 3 months 18 days		23 years 3 months 18 days

[1] Excluding the six months ended June 30, 2021.