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Leases - Land Lease Obligations (Details) | 12 Months Ended
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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 |  |

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