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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Marketable Securities [Line Items] |  |
Fair Value | $ 422,665 | $ 441,534
Gross Unrealized Gains | 14,234 | 3,877
Gross Unrealized Losses | 169 | 3,223
Amortized Cost | 408,600 | 440,880
State and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 324,447 | 334,717
Gross Unrealized Gains | 13,727 | 3,791
Gross Unrealized Losses |  | 1,806
Amortized Cost | 310,720 | 332,732
U.S. government agencies [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 97,718 | 104,822
Gross Unrealized Gains | 507 | 86
Gross Unrealized Losses | 169 | 1,417
Amortized Cost | 97,380 | 106,153
Certificates of Deposit [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 500 | 1,995
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Amortized Cost | $ 500 | $ 1,995

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