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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment [Line Items]
Fair Value	$ 426,315	$ 390,552
Gross Unrealized Gains	6,961	5,239
Gross Unrealized Losses	2,940	3,731
Amortized Cost	422,294	389,044
State and Political Subdivisions [Member]
Investment [Line Items]
Fair Value	407,433	370,134
Gross Unrealized Gains	6,961	5,239
Gross Unrealized Losses	2,539	3,328
Amortized Cost	403,011	368,223
U.S. government agencies [Member]
Investment [Line Items]
Fair Value	12,386	12,672
Gross Unrealized Gains
Gross Unrealized Losses	401	403
Amortized Cost	12,787	13,075
Certificates of Deposit [Member]
Investment [Line Items]
Fair Value	6,496	7,746
Gross Unrealized Gains
Gross Unrealized Losses
Amortized Cost	$ 6,496	$ 7,746

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
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-Topic 320
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-Section 50
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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
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