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Loans and Allowance for Loan Losses (Details 1) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Concentrations within the loan portfolio      
Loans $ 1,041,189,000 $ 1,072,422,000 $ 1,262,630,000
Commercial real estate loans to lessors of non-residential buildings, Percentage of Loan Portfolio 100.00% 100.00%  
Commercial real estate loans to lessors of non-residential buildings [Member]
     
Concentrations within the loan portfolio      
Loans $ 302,723,000 $ 320,536,000  
Commercial real estate loans to lessors of non-residential buildings, Percentage of Loan Portfolio 29.10% 29.90%