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Investment in Securities (Schedule of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Fair Value	$ 431,979	$ 390,552
Gross Unrealized Gains	11,256	5,239
Gross Unrealized Losses	1,404	3,731
Amortized Cost	422,127	389,044
State and Political Subdivisions [Member]
Investment [Line Items]
Fair Value	414,115	370,134
Gross Unrealized Gains	11,256	5,239
Gross Unrealized Losses	1,076	3,328
Amortized Cost	403,935	368,223
U.S. government agencies [Member]
Investment [Line Items]
Fair Value	12,118	12,672
Gross Unrealized Gains
Gross Unrealized Losses	328	403
Amortized Cost	12,446	13,075
Certificates of Deposit [Member]
Investment [Line Items]
Fair Value	5,746	7,746
Gross Unrealized Gains
Gross Unrealized Losses
Amortized Cost	$ 5,746	$ 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
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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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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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