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Borrowings (Details 3) (USD $)
 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Mar. 17, 2005
Exchange Statutory Trust II
Dec. 31, 2013
Exchange Statutory Trust II
Mar. 17, 2004
Exchange Statutory Trust I
Dec. 31, 2013
Exchange Statutory Trust I
Borrowings            
Trust preferred securities issued     $ 23,000,000   $ 25,000,000  
Term     30 years      
Description of variable rate       three-month LIBOR   three-month LIBOR
Basis spread on variable rate (as a percent)       1.83%   2.70%
Interest rate at end of period (as a percent)       2.07%   2.94%
Period of time after issuance in which TPS can be repaid without penalty       5 years    
Investment in common interests of the trust during the period 712,000          
Investment in preferred interests of the trust by a third party during the period 23,000,000          
Subordinated notes 49,486,000 49,486,000        
Investment in common securities of the trust $ 1,500,000