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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Estimated fair value less than 12 months | $ 121,657 | $ 68,938
Estimated fair value 12 months or more | 98,551 | 42,568
Estimated fair value total | 220,208 | 111,506
Unrealized losses, less than 12 months | 686 | 499
Unrealized losses, 12 months or more | 2,537 | 884
Unrealized losses, total | 3,223 | 1,383
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Estimated fair value less than 12 months | 91,248 | 34,755
Estimated fair value 12 months or more | 60,546 | 31,251
Estimated fair value total | 151,794 | 66,006
Unrealized losses, less than 12 months | 556 | 123
Unrealized losses, 12 months or more | 1,250 | 538
Unrealized losses, total | 1,806 | 661
U.S. government agencies [Member] |  |
Investment [Line Items] |  |
Estimated fair value less than 12 months | 30,409 | 34,183
Estimated fair value 12 months or more | 38,005 | 11,317
Estimated fair value total | 68,414 | 45,500
Unrealized losses, less than 12 months | 130 | 376
Unrealized losses, 12 months or more | 1,287 | 346
Unrealized losses, total | 1,417 | 722
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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