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Long-term Debt (Narrative) (Details) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 Facility | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |
Long-term debt outstanding |  | $ 32,903,000 | $ 48,024,000 |
Number of lease agreement under non-cancelable finance lease | Facility | 1 |  |  |
FHLB prepayment |  | 20,000,000 |  |
FHLB prepayment penalty |  | 93,000 | 0 | $ 0
FHLB fixed rate instruments, aggregate principal amounts due, 2019 |  | 27,746,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2020 |  | 258,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2021 |  | 271,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2022 |  | 284,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, 2023 |  | 299,000 |  |
FHLB fixed rate instruments, aggregate principal amounts due, thereafter |  | 535,000 |  |
FHLB [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letter of credit outstanding, amount |  | $ 169,051,000 | $ 36,850,000 |

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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=6876686&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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- Definition Amount of advances from Federal Home Loan Bank (FHLBank) maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: 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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