Loans and Allowance for Loan Losses (Details Textual) (USD $)
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]    
Due days of accrual of interest on all loans 90 days  
Originate loans with a loan-to-value 80.00%  
Unallocated reserves for loan losses $ 49,000,000 $ 0
Post-modification outstanding recorded investment 7,500,000 0
Loans sold with recourse 1,500,000 1,500,000
Residential mortgage [Member]
   
Loans and Allowance for Loan Losses (Textual) [Abstract]    
Loans previously sold and serviced 71,900,000 28,300,000
Indirect auto loans [Member]
   
Loans and Allowance for Loan Losses (Textual) [Abstract]    
Loans previously sold and serviced $ 88,900,000 $ 28,300,000