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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment [Line Items] |  |
Fair Value | $ 441,534 | $ 470,523
Gross Unrealized Gains | 3,877 | 9,528
Gross Unrealized Losses | 3,223 | 1,383
Amortized Cost | 440,880 | 462,378
State and Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Fair Value | 334,717 | 417,032
Gross Unrealized Gains | 3,791 | 9,528
Gross Unrealized Losses | 1,806 | 661
Amortized Cost | 332,732 | 408,165
U.S. government agencies [Member] |  |
Investment [Line Items] |  |
Fair Value | 104,822 | 45,500
Gross Unrealized Gains | 86 |
Gross Unrealized Losses | 1,417 | 722
Amortized Cost | 106,153 | 46,222
Certificates of Deposit [Member] |  |
Investment [Line Items] |  |
Fair Value | 1,995 | 7,991
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Amortized Cost | $ 1,995 | $ 7,991

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