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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Investment [Line Items] |  |
Estimated fair value less than 12 months | $ 153,056 | $ 3,638
Estimated fair value 12 months or more |  | 1,208
Estimated fair value total | 153,056 | 4,846
Unrealized losses, less than 12 months | 3,731 | 5
Unrealized losses, 12 months or more |  | 8
Unrealized losses, total | 3,731 | 13
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Estimated fair value less than 12 months | 140,384 | 3,638
Estimated fair value 12 months or more |  | 1,208
Estimated fair value total | 140,384 | 4,846
Unrealized losses, less than 12 months | 3,328 | 5
Unrealized losses, 12 months or more |  | 8
Unrealized losses, total | 3,328 | 13
U.S. government agencies [Member] |  |
Investment [Line Items] |  |
Estimated fair value less than 12 months | 12,672 |
Estimated fair value 12 months or more |  |
Estimated fair value total | 12,672 |
Unrealized losses, less than 12 months | 403 |
Unrealized losses, 12 months or more |  |
Unrealized losses, total | 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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27290-111563 + Details
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