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Investment in Securities (Schedule of Investement Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment [Line Items]
Amortized Cost	$ 352,467	$ 342,219
Gross Unrealized Gains	10,762	14,120
Gross Unrealized Losses	76	198
Fair Value	363,153	356,141
State and Political Subdivisions [Member]
Investment [Line Items]
Amortized Cost	347,721	338,469
Gross Unrealized Gains	10,762	14,120
Gross Unrealized Losses	76	198
Fair Value	358,407	352,391
Certificates Of deposit [Member]
Investment [Line Items]
Amortized Cost	$ 4,746	$ 3,750
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	$ 4,746	$ 3,750

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

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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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