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Mortgage Servicing Rights and Mortgage Servicing Activity (Details Textual) (USD $)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]            
Mortgage Servicing Rights $ 22,150,000 $ 22,604,000 $ 22,469,000 $ 22,760,000 $ 21,378,000 $ 21,316,000
Unpaid principal balances from sale of residential mortgage loans 143,600,000 310,100,000        
Recognized pretax gains 3,500,000 6,700,000        
Related mortgage servicing rights from loans sold and receives servicing fees 125,200,000 285,300,000        
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%          
Residential Mortgages
           
Servicing Assets at Fair Value [Line Items]            
Loan servicing fees 3,300,000 3,100,000        
Servicing Asset $ 2,700,000,000