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Investment in Securities (Schedule of Investement Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Amortized Cost	$ 315,809	$ 312,153
Gross Unrealized Losses	10,801	8,537
Gross Unrealized Gains	1,498	2,923
Fair Value	325,112	317,767
State and Political Subdivisions [Member]
Investment [Line Items]
Amortized Cost	312,059	308,403
Gross Unrealized Losses	10,801	8,537
Gross Unrealized Gains	1,498	2,923
Fair Value	321,362	314,017
Certificates Of Deposit [Member]
Investment [Line Items]
Amortized Cost	3,750	3,750
Gross Unrealized Losses
Gross Unrealized Gains
Fair Value	$ 3,750	$ 3,750

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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)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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-Section 50

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

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