Fair Value of Financial Instruments (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Fair Value Disclosures
Impaired loans	$ 3,752	$ 2,736	$ 4,628
Other real estate owned	1,561	2,258	1,768
Fair Value Measurement Using: Level 2
Fair Value Disclosures
Loans held for sale	3,643	3,681	62
Non-recurring basis | Fair Value Measurement Using: Level 2
Fair Value Disclosures
Loans held for sale	3,643		62
Other real estate owned	1,561		1,768
Total assets	5,204		1,830
Non-recurring basis | Fair Value Measurement Using: Level 3
Fair Value Disclosures
Impaired loans	3,752		4,628
Total assets	3,752		4,628
Non-recurring basis | Assets at Fair Value
Fair Value Disclosures
Impaired loans	3,752		4,628
Loans held for sale	3,643		62
Other real estate owned	1,561		1,768
Total assets	$ 8,956		$ 6,458