Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Securities Available-for-Sale
Amortized Cost	$ 173,206	$ 218,693
Gross Unrealized Gains	10,226	10,567
Gross Unrealized Losses		(37)
Estimated Fair Value	183,432	229,223
Obligations of U.S. government corporations and agencies [Member]
Securities Available-for-Sale
Amortized Cost	161,785	207,284
Gross Unrealized Gains	9,794	10,100
Gross Unrealized Losses
Estimated Fair Value	171,579	217,384
Obligations of states and political subdivisions [Member]
Securities Available-for-Sale
Amortized Cost	9,562	9,561
Gross Unrealized Gains	389	467
Gross Unrealized Losses
Estimated Fair Value	9,951	10,028
Corporate debt securities [Member]
Securities Available-for-Sale
Amortized Cost	1,859	1,848
Gross Unrealized Gains	43
Gross Unrealized Losses		(37)
Estimated Fair Value	$ 1,902	$ 1,811

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

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 9: http://www.xbrl.org/2003/role/presentationRef

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

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+ Details

- Definition

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+ Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details