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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Fair Value	$ 387,994	$ 422,665
Gross Unrealized Gains	13,574	14,234
Gross Unrealized Losses		169
Amortized Cost	374,420	408,600
State and Political Subdivisions [Member]
Marketable Securities [Line Items]
Fair Value	300,641	324,447
Gross Unrealized Gains	12,010	13,727
Gross Unrealized Losses
Amortized Cost	288,631	310,720
U.S. government agencies [Member]
Marketable Securities [Line Items]
Fair Value	86,853	97,718
Gross Unrealized Gains	1,564	507
Gross Unrealized Losses		169
Amortized Cost	85,289	97,380
Certificates of Deposit [Member]
Marketable Securities [Line Items]
Fair Value	500	500
Gross Unrealized Gains
Gross Unrealized Losses
Amortized Cost	$ 500	$ 500

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

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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=121645371&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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- Definition

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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