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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Investment [Line Items] |  |
Estimated fair value less than 12 months | $ 68,938 | $ 153,056
Estimated fair value 12 months or more | 42,568 |
Estimated fair value total | 111,506 | 153,056
Unrealized losses, less than 12 months | 499 | 3,731
Unrealized losses, 12 months or more | 884 |
Unrealized losses, total | 1,383 | 3,731
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Estimated fair value less than 12 months | 34,755 | 140,384
Estimated fair value 12 months or more | 31,251 |
Estimated fair value total | 66,006 | 140,384
Unrealized losses, less than 12 months | 123 | 3,328
Unrealized losses, 12 months or more | 538 |
Unrealized losses, total | 661 | 3,328
U.S. government agencies [Member] |  |
Investment [Line Items] |  |
Estimated fair value less than 12 months | 34,183 | 12,672
Estimated fair value 12 months or more | 11,317 |
Estimated fair value total | 45,500 | 12,672
Unrealized losses, less than 12 months | 376 | 403
Unrealized losses, 12 months or more | 346 |
Unrealized losses, total | 722 | 403
Certificates of Deposit [Member] |  |
Investment [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 |  |

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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 twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&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 in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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