Leases - Land Lease Obligations (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
Lease costs
Land lease expense	$ 400	$ 325	$ 1,135	$ 977
Finance lease right-of-use asset amortization and interest expense	100	0	200	0
Operating cash outflows	$ 282	$ 267	$ 816	$ 802
Weighted-average remaining lease term - operating leases (years)	33 years 10 months 24 days	38 years 2 months 12 days	33 years 10 months 24 days	38 years 2 months 12 days
Weighted-average discount rate - operating leases	4.13%	4.13%	4.13%	4.13%
Operating cash outflows	$ 64	$ 0	$ 151	$ 0
Financing cash outflows	$ 19	$ 0	$ 73	$ 0
Weighted-average remaining lease term - finance leases (years)	3 years	0 years	3 years	0 years
Weighted-average discount rate - operating leases	4.13%	0.00%	4.13%	0.00%
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 0	$ 6,302	$ 0
Right-of-use assets net change	$ 0	$ 0	$ 6,302	$ 0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets		Other Assets		Other Assets
Right of use assets	$ 61,100		$ 61,100		$ 44,500
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts Payable and Accrued Liabilities		Accounts Payable and Accrued Liabilities		Accounts Payable and Accrued Liabilities
Operating Lease Liability, Before Depreciation	$ 25,000		$ 25,000		$ 17,300
Maturity Analysis of Lease Liabilities for Operating Leases
Lease payments 2021 (remaining)	295		295
Lease payments 2022	1,197		1,197
Lease payments 2023	1,197		1,197
Lease payments 2024	1,197		1,197
Lease payments 2025	1,197		1,197
Lease payment Thereafter	31,045		31,045
Total lease payments	36,128		36,128
Imputed interest 2021 (remaining)	(186)		(186)
Imputed interest 2022	(730)		(730)
Imputed interest 2023	(711)		(711)
Imputed interest 2024	(690)		(690)
Imputed interest 2025	(669)		(669)
Imputed interest Thereafter	(15,137)		(15,137)
Total imputed interest	(18,123)		(18,123)
Total Lease Liabilities 2021 (remaining)	109		109
Total Lease Liabilities 2022	467		467
Total Lease Liabilities 2023	486		486
Total Lease Liabilities 2024	507		507
Total Lease Liabilities 2025	528		528
Total Lease Liabilities Thereafter	15,908		15,908
Total lease liabilities	18,005		18,005
Maturity Analysis of Lease Liabilities for Finance Leases
Lease payments 2021 (remaining)	84		84
Lease payments 2022	336		336
Lease payments 2023	336		336
Lease payments 2024	6,196		6,196
Lease Payment 2025	0		0
Thereafter	0		0
Total lease payments	6,952		6,952
Imputed interest 2021 (remaining)	(64)		(64)
Imputed interest 2022	(255)		(255)
Imputed interest 2023	(252)		(252)
Imputed interest 2024	(207)		(207)
Imputed interest 2025	0		0
Imputed interest Thereafter	0		0
Imputed interest Total	(778)		(778)
Total lease Liabilities 2021 (remaining)	20		20
Total Lease Liabilities 2022	81		81
Total Lease Liabilities 2023	84		84
Total Lease Liabilities 2024	5,989		5,989
Total Lease Liabilities 2025	0		0
Total Lease Liabilities Thereafter	0		0
Total lease liabilities	$ 6,174		$ 6,174