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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Fair Value | $ 507,047 | $ 357,726
Gross Unrealized Gains | 17,457 | 19,679
Gross Unrealized Losses | 472 |
Amortized Cost | 490,062 | 338,047
State and political subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 351,695 | 305,974
Gross Unrealized Gains | 16,004 | 18,915
Gross Unrealized Losses | 48 |
Amortized Cost | 335,739 | 287,059
U.S. government agencies [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 90,933 | 51,752
Gross Unrealized Gains | 601 | 764
Gross Unrealized Losses | 424 |
Amortized Cost | 90,756 | $ 50,988
Corporate Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 64,419 |
Gross Unrealized Gains | 852 |
Gross Unrealized Losses |  |
Amortized Cost | $ 63,567 |

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