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Investment in Securities (Schedule of the Fair Values of Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Estimated fair value, less than 12 months | $ 7,084 | $ 121,657
Estimated fair value, 12 months or more | 25,809 | 98,551
Estimated fair value, total | 32,893 | 220,208
Unrealized losses, less than 12 months | 19 | 686
Unrealized losses, 12 months or more | 225 | 2,537
Unrealized losses, total | 244 | 3,223
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Estimated fair value, less than 12 months | 1,117 | 91,248
Estimated fair value, 12 months or more |  | 60,546
Estimated fair value, total | 1,117 | 151,794
Unrealized losses, less than 12 months | 1 | 556
Unrealized losses, 12 months or more |  | 1,250
Unrealized losses, total | 1 | 1,806
U.S. government agencies [Member] |  |
Investment [Line Items] |  |
Estimated fair value, less than 12 months | 5,967 | 30,409
Estimated fair value, 12 months or more | 25,809 | 38,005
Estimated fair value, total | 31,776 | 68,414
Unrealized losses, less than 12 months | 18 | 130
Unrealized losses, 12 months or more | 225 | 1,287
Unrealized losses, total | $ 243 | $ 1,417

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