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Securities (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Contract
Dec. 31, 2012
Contract
Securities (Textual) [Abstract]    
Number of U.S. agency and mortgage-backed securities 16 12
Number of obligations of state and political subdivisions in an unrealized loss position 12 9
Percentage of investment portfolio 100.00% 100.00%
Weighted-average period of re-pricing of portfolio 4 years 3 months 18 days 3 years 7 months 6 days
Impairment recognized $ 0