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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Fair Value | $ 427,244 | $ 357,726
Gross Unrealized Gains | 16,301 | 19,679
Gross Unrealized Losses | 885 |
Amortized Cost | 411,828 | 338,047
State and political subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 327,983 | 305,974
Gross Unrealized Gains | 15,678 | 18,915
Gross Unrealized Losses | 174 |
Amortized Cost | 312,479 | 287,059
U.S. government agencies [Member] |  |
Marketable Securities [Line Items] |  |
Fair Value | 99,261 | 51,752
Gross Unrealized Gains | 623 | 764
Gross Unrealized Losses | 711 |
Amortized Cost | $ 99,349 | $ 50,988

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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