Loans (Details Textual) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Loans (Textual) [Abstract]
Concentrations of loans	$ 0		$ 0
Minimum percentage of concentrations of loans	10.00%		10.00%
Allowance for loan losses	10,579,000	10,600,000	10,648,000
Ratio of the allowance for loan losses to total loans	1.95%	1.89%	1.98%
Company's annualized net charge off ratios	0.33%	1.08%	0.52%
Ratios of allowance for loan losses to non-accrual loans	150.35%	94.59%	138.99%
Annual reviews of loan to ascertain the borrowers continued ability to service	1,000,000
Loans past due period for classify to risk grade	60 days
Loans past due period for classify to substandard grade	12 months
Company's impaired loans	43,665,000	82,200,000	66,604,000
Related Allowance	$ 2,664,000	$ 4,600,000	$ 3,841,000