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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable Securities [Line Items] |  |
Estimated fair value less than 12 months | $ 3,801 | $ 121,657
Estimated fair value 12 months or more | 17,593 | 98,551
Estimated fair value total | 21,394 | 220,208
Unrealized losses, less than 12 months | 12 | 686
Unrealized losses, 12 months or more | 157 | 2,537
Unrealized losses, total | 169 | 3,223
State and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Estimated fair value less than 12 months |  | 91,248
Estimated fair value 12 months or more |  | 60,546
Estimated fair value total |  | 151,794
Unrealized losses, less than 12 months |  | 556
Unrealized losses, 12 months or more |  | 1,250
Unrealized losses, total |  | 1,806
U.S. government agencies [Member] |  |
Marketable Securities [Line Items] |  |
Estimated fair value less than 12 months | 3,801 | 30,409
Estimated fair value 12 months or more | 17,593 | 38,005
Estimated fair value total | 21,394 | 68,414
Unrealized losses, less than 12 months | 12 | 130
Unrealized losses, 12 months or more | 157 | 1,287
Unrealized losses, total | 169 | 1,417
Certificates of Deposit [Member] |  |
Marketable Securities [Line Items] |  |
Estimated fair value less than 12 months |  |
Estimated fair value 12 months or more |  |
Estimated fair value total |  |
Unrealized losses, less than 12 months |  |
Unrealized losses, 12 months or more |  |
Unrealized losses, total |  |

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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