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Long-term Debt (Narrative) (Details) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 Facility | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Long-term debt outstanding |  | $ 75,115,000 | $ 32,903,000 |
Number of lease agreement under non-cancelable finance lease | Facility | 1 |  |  |
FHLB prepayment |  | 25,000,000 | 20,000,000 |
FHLB prepayment penalty |  | 165,000 | 93,000 | $ 0
FHLB fixed rate instruments, aggregate principal amounts due, 2021 |  | 258,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2022 |  | 70,271,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2023 |  | 284,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2024 |  | 299,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2025 |  | 313,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, thereafter |  | 223,000 |  |
FHLB [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letter of credit outstanding, amount |  | $ 288,950,000 | $ 169,051,000 |

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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64702-112823 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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