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Mortgage Servicing Rights and Mortgage Servicing Activity (Details Textual) (USD $)
6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Residential Mortgages [Member]
Jun. 30, 2012
Residential Mortgages [Member]
Apr. 12, 2013
Citizens Republic Bancorp
Apr. 12, 2013
Citizens Republic Bancorp
Residential Mortgages [Member]
Servicing Assets at Fair Value [Line Items]                    
Loan servicing fees             $ 3,100,000 $ 2,800,000    
Servicing Asset             2,700,000,000 2,400,000,000   200,000,000
Mortgage Servicing Rights 22,604,000 21,273,000 21,378,000 21,316,000 20,946,000 21,179,000     1,065,000  
Unpaid principal balances from sale of residential mortgage loans 310,100,000 410,200,000                
Recognized pretax gains 6,700,000 4,200,000                
Related mortgage servicing rights from loans sold and receives servicing fees $ 285,300,000 $ 394,300,000                
Minimum percentage adverse change in prepayment speed 10.00%                  
Maximum percentage adverse change in prepayment speed 25.00%                  
Percentage of variation in prepayment speed 10.00%