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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Fair Value	$ 440,863	$ 470,523
Gross Unrealized Gains	3,284	9,528
Gross Unrealized Losses	5,289	1,383
Amortized Cost	442,868	462,378
State and Political Subdivisions [Member]
Investment [Line Items]
Fair Value	343,685	417,032
Gross Unrealized Gains	3,276	9,528
Gross Unrealized Losses	3,441	661
Amortized Cost	343,850	408,165
U.S. government agencies [Member]
Investment [Line Items]
Fair Value	89,938	45,500
Gross Unrealized Gains	8
Gross Unrealized Losses	1,848	722
Amortized Cost	91,778	46,222
Certificates of Deposit [Member]
Investment [Line Items]
Fair Value	7,240	7,991
Gross Unrealized Gains
Gross Unrealized Losses
Amortized Cost	$ 7,240	$ 7,991

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

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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=82897076&loc=d3e27161-111563

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

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