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Investment in Securities (Schedule of Investement Securities) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Investment [Line Items]
Amortized Cost	$ 301,081	$ 322,087
Gross Unrealized Losses	9,944	19,960
Gross Unrealized Gains	2,304	112
Fair Value	308,721	341,935
State and Political Subdivisions [Member]
Investment [Line Items]
Amortized Cost	297,331	315,345
Gross Unrealized Losses	9,944	19,960
Gross Unrealized Gains	2,304	112
Fair Value	304,971	335,193
Certificates Of Deposit [Member]
Investment [Line Items]
Amortized Cost	3,750	6,742
Gross Unrealized Losses
Gross Unrealized Gains
Fair Value	$ 3,750	$ 6,742

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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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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.

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-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

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-Section 50

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