Investment Securities (Details 3) (USD $)	Mar. 31, 2013	Dec. 31, 2012
The recorded book value, fair value and approximate yield of investment securities by contractual maturity
Within One Year, Amortized Cost	$ 973,000
After One But Within Five Years, Amortized Cost	7,480,000
After Five But Within Ten Years, Amortized Cost	61,196,000
After Ten Years, Amortized Cost	26,552,000
Amortized Cost, Total	96,201,000
Available-for-sale securities, Amortized Cost	171,959,000	173,190,000
Within One year, Fair Value	986,000
After One But Within Five Years, Fair value	7,570,000
After Five But Within Ten Years, Fair Value	62,390,000
After Ten Years, Fair Value	28,418,000
Fair Value, Total	99,364,000
Available-for-sale (at fair value)	175,853,312	178,207,974
Available-for-sale securities, Yield	3.04%	3.00%
U.S. Government corporations and agencies [Member]
The recorded book value, fair value and approximate yield of investment securities by contractual maturity
Within One Year, Amortized Cost	2,000	10,000
After One But Within Five Years, Amortized Cost	6,000,000	6,000,000
After Five But Within Ten Years, Amortized Cost	39,588,000	41,088,000
After Ten Years, Amortized Cost	3,000	3,000
Amortized Cost, Total	45,593,000	47,101,000
Available-for-sale securities, Amortized Cost	45,593,000	47,101,000
Within One year, Fair Value	2,000	10,000
After One But Within Five Years, Fair value	6,011,000	6,034,000
After Five But Within Ten Years, Fair Value	39,664,000	41,248,000
After Ten Years, Fair Value	3,000	3,000
Fair Value, Total	45,680,000	47,295,000
Available-for-sale (at fair value)	45,680,000	47,295,000
Within One Year, Yield	0.01%	0.01%
After One But Within Five Years, Yield	1.88%	1.88%
After Five But Within Ten years, Yield	1.70%	1.75%
After Ten Years, Yield	0.86%	0.87%
Yield, total	1.72%	1.77%
States and political subdivisions [Member]
The recorded book value, fair value and approximate yield of investment securities by contractual maturity
Within One Year, Amortized Cost	971,000	970,000
After One But Within Five Years, Amortized Cost	1,480,000	1,101,000
After Five But Within Ten Years, Amortized Cost	21,608,000	19,439,000
After Ten Years, Amortized Cost	26,549,000	26,883,000
Amortized Cost, Total	50,608,000	48,393,000
Available-for-sale securities, Amortized Cost	50,608,000	48,393,000
Within One year, Fair Value	983,000	990,000
After One But Within Five Years, Fair value	1,560,000	1,158,000
After Five But Within Ten Years, Fair Value	22,726,000	20,633,000
After Ten Years, Fair Value	28,415,000	29,249,000
Fair Value, Total	53,684,000	52,030,000
Available-for-sale (at fair value)	53,684,000	52,030,000
Within One Year, Yield	4.99%	4.98%
After One But Within Five Years, Yield	6.13%	5.92%
After Five But Within Ten years, Yield	5.14%	5.23%
After Ten Years, Yield	5.77%	5.90%
Yield, total	5.50%	5.62%
Mortgage-Backed Securities [Member]
The recorded book value, fair value and approximate yield of investment securities by contractual maturity
Available-for-sale securities, Amortized Cost	75,573,000	77,513,000
Available-for-sale (at fair value)	76,274,000	78,678,000
Available-for-sale securities, Yield	2.10%	2.01%
Equity securities [Member]
The recorded book value, fair value and approximate yield of investment securities by contractual maturity
Available-for-sale securities, Amortized Cost	185,000	183,000
Available-for-sale (at fair value)	$ 215,000	$ 205,000
Available-for-sale securities, Yield	3.81%	1.97%