Investment Securities (Details 3) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Investment securities available for sale, Amortized Cost
One Year or Less	$ 2,006,000
More than One Year to Five Years	15,285,000
More than Five Years to Ten Years	59,351,000
More than Ten Years	239,223,000
Total	315,865,000
Investment securities available for sale, Fair Value
One Year or Less	2,006,000
More than One Year to Five Years	15,200,000
More than Five Years to Ten Years	58,481,000
More than Ten Years	237,360,000
Total	313,047,000	84,066,000	146,134,000
Accumulated other comprehensive income (loss)	(2,800,000)	1,900,000
Accumulated other comprehensive income (loss), net of tax	(1,659,000)	1,105,000	1,159,000
U.S. Treasury
Investment securities available for sale, Amortized Cost
More than One Year to Five Years	73,000
Total	73,000
Investment securities available for sale, Fair Value
More than One Year to Five Years	83,000
Total	83,000
Corporate
Investment securities available for sale, Amortized Cost
One Year or Less	2,006,000
More than One Year to Five Years	7,163,000
Total	9,169,000
Investment securities available for sale, Fair Value
One Year or Less	2,006,000
More than One Year to Five Years	7,163,000
Total	9,169,000
Municipal bonds
Investment securities available for sale, Amortized Cost
More than One Year to Five Years	7,998,000
More than Five Years to Ten Years	43,271,000
More than Ten Years	44,988,000
Total	96,257,000
Investment securities available for sale, Fair Value
More than One Year to Five Years	7,900,000
More than Five Years to Ten Years	42,550,000
More than Ten Years	44,297,000
Total	94,747,000
Mortgage-backed securities
Investment securities available for sale, Amortized Cost
More than One Year to Five Years	51,000
More than Five Years to Ten Years	16,080,000
More than Ten Years	194,235,000
Total	210,366,000
Investment securities available for sale, Fair Value
More than One Year to Five Years	54,000
More than Five Years to Ten Years	15,931,000
More than Ten Years	193,063,000
Total	$ 209,048,000