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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2009 | Dec. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |
Long-term debt |  | $ 100,929 | $ 100,929
Partnership total assets |  | 8,000 | $ 8,200
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Long-term debt |  | 30,900 |
Equity method investments |  | $ 900 |
Liberty Mews Limited Partnership [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership in Liberty Mews Limited Partnership |  | 99.90% |
Subsidiaries [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments | $ 6,100 |  |
VIE financing | 10,600 |  |
Purchase of land for low income housing by Liberty Mews | $ 10,600 |  |
Federal investment tax credits |  | $ 8,400 |
Federal investment tax credit duration |  | 10 years |
Subsidiaries [Member] | Liberty Mews Limited Partnership [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Ownership in Liberty Mews Limited Partnership | 99.99% |  |
Liberty Mews Limited Partnership [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Equity method investments |  | $ 6,100 |
Impact of tax credits on total tax expense |  | $ (800) |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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