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Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of cost basis and fair values of investment securities
Investment securities available for sale, Cost Basis	$ 169,940	$ 176,173
Investment securities available for sale, Gross Unrealized Gains	7,030	6,785
Investment securities available for sale, Gross Unrealized Losses	(74)	(35)
Investment securities available for sale, Fair Value	176,896	182,923
Investment securities held to maturity, Cost Basis	14,895	12,280
Investment securities held to maturity, Gross Unrealized Gains	638	643
Investment securities held to maturity, Gross Unrealized Losses	(76)	(9)
Investment securities held to maturity, Fair Value	15,457	12,914
U.S. Agency [Member]
Summary of cost basis and fair values of investment securities
Investment securities available for sale, Cost Basis	7,248	10,689
Investment securities available for sale, Gross Unrealized Gains	70	48
Investment securities available for sale, Gross Unrealized Losses	(1)	(28)
Investment securities available for sale, Fair Value	7,317	10,709
U.S. Agency mortgage-backed securities [Member]
Summary of cost basis and fair values of investment securities
Investment securities available for sale, Cost Basis	156,701	165,484
Investment securities available for sale, Gross Unrealized Gains	6,960	6,737
Investment securities available for sale, Gross Unrealized Losses	(26)	(7)
Investment securities available for sale, Fair Value	163,635	172,214
Investment securities held to maturity, Cost Basis	10,895	9,280
Investment securities held to maturity, Gross Unrealized Gains	638	643
Investment securities held to maturity, Fair Value	11,533	9,923
Corporate bonds [Member]
Summary of cost basis and fair values of investment securities
Investment securities available for sale, Cost Basis	5,991
Investment securities available for sale, Gross Unrealized Losses	(47)
Investment securities available for sale, Fair Value	5,944
Other Securities [Member]
Summary of cost basis and fair values of investment securities
Investment securities held to maturity, Cost Basis	4,000	3,000
Investment securities held to maturity, Gross Unrealized Losses	(76)	(9)
Investment securities held to maturity, Fair Value	$ 3,924	$ 2,991

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

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