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Leases - Land Lease Obligations (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lease costs      
Land lease expense $ 1,301,000 $ 1,242,000 $ 645,000
Lessee, Finance Lease, Number Of Contracts | contract 2    
Finance lease right-of-use asset amortization and interest expense $ 0    
Operating lease costs 1,705,000 1,131,000  
Variable lease costs 0 0  
Total non-variable lease costs 1,705,000 1,131,000  
Right-of-use assets obtained in exchange for new operating lease liabilities 1,064,000 19,672,000  
Right-of-use assets removed in exchange for real property 0 (3,025,000)  
Right-of-use assets net change 1,064,000 16,647,000  
Operating cash outflows from operating leases $ 1,069,000 $ 1,073,000  
Weighted-average remaining lease term - operating leases (years) 38 years 3 months 18 days 38 years 2 months 12 days  
Weighted-average discount rate - operating leases 4.13% 4.13%  
Maturity Analysis of Lease Liabilities      
Lease payments 2021 $ 1,033,000    
Lease payments 2022 1,026,000    
Lease payments 2023 1,031,000    
Lease payments 2024 1,031,000    
Lease Payment 2025 1,031,000    
Lease Payment Thereafter 30,036,000    
Total lease payments 35,188,000    
Imputed interest 2021 (685,000)    
Imputed interest 2022 (676,000)    
Imputed interest 2023 (661,000)    
Imputed interest 2024 (645,000)    
Imputed Interest 2025 (629,000)    
Imputed Interest Thereafter (15,025,000)    
Total imputed interest (18,321,000)    
Total Lease Liabilities 2021 348,000    
Total Lease Liabilities 2022 350,000    
Total Lease Liabilities 2023 370,000    
Total Lease Liabilities 2024 386,000    
Total Lease Liabilities 2025 402,000    
Total Lease Liabilities Thereafter 15,011,000    
Total lease liabilities $ 16,867,000