Investment Securities (Details 3) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Investment securities available for sale, Amortized Cost
More than One Year to Five Years	$ 4,739,000
More than Five Years to Ten Years	74,075,000
More than Ten Years	219,685,000
Total	298,499,000
Investment securities available for sale, Fair Value
More than One Year to Five Years	4,744,000
More than Five Years to Ten Years	74,484,000
More than Ten Years	221,932,000
Total	301,160,000	84,066,000	150,739,000
Stock, Amortized Cost
FHLB	8,955,000	9,228,000	9,956,000
Federal Reserve Bank	2,019,000	2,019,000	2,019,000
Total equities held at cost	10,974,000	11,247,000	11,975,000
Stock, Fair Value
FHLB	8,955,000	9,228,000	9,956,000
Federal Reserve Bank stock	2,019,000	2,019,000	2,019,000
Total stock	10,974,000	11,247,000	11,975,000
Total securities, Amortized Cost
One Year or Less	10,974,000
More than One Year to Five Years	4,739,000
More than Five Years to Ten Years	74,075,000
More than Ten Years	219,685,000
Amortized Cost	309,473,000	93,436,000	162,037,000
Total securities, Fair Value
One Year or Less	10,974,000
More than One Year to Five Years	4,744,000
More than Five Years to Ten Years	74,484,000
More than Ten Years	221,932,000
Total securities	312,134,000	95,313,000	162,714,000
Accumulated other comprehensive income (loss)	2,700,000	1,900,000
Accumulated other comprehensive income (loss), net of tax	1,566,000	1,105,000	399,000
U.S. Treasury
Investment securities available for sale, Amortized Cost
More than Five Years to Ten Years	74,000
Total	74,000
Investment securities available for sale, Fair Value
More than Five Years to Ten Years	85,000
Total	85,000
Municipal bonds
Investment securities available for sale, Amortized Cost
More than One Year to Five Years	4,716,000
More than Five Years to Ten Years	61,012,000
More than Ten Years	88,815,000
Total	154,543,000
Investment securities available for sale, Fair Value
More than One Year to Five Years	4,720,000
More than Five Years to Ten Years	61,297,000
More than Ten Years	89,922,000
Total	155,939,000
Mortgage-backed securities
Investment securities available for sale, Amortized Cost
More than One Year to Five Years	23,000
More than Five Years to Ten Years	12,989,000
More than Ten Years	130,870,000
Total	143,882,000
Investment securities available for sale, Fair Value
More than One Year to Five Years	24,000
More than Five Years to Ten Years	13,102,000
More than Ten Years	132,010,000
Total	$ 145,136,000