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Goodwill, Core Deposit Premium and Other Intangible Assets (Mortgage loans servicing) (Details) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Valuation servicing rights in tranches [Line Items]      
Mortgage loans serviced for others $ 3,360,000,000   $ 3,050,000,000
Servicing asset at amortized value 33,260,000 31,179,000 32,000,000
Mortgage Servicing Rights 15-year Tranche [Member]
     
Valuation servicing rights in tranches [Line Items]      
Servicing asset, agreement term 15 years    
Mortgage Servicing Rights 30-year Tranche [Member]
     
Valuation servicing rights in tranches [Line Items]      
Servicing asset, agreement term 30 years    
Mortgage Servicing Rights [Member]
     
Valuation servicing rights in tranches [Line Items]      
Prepayment rate 11.00%   9.65%
Discount rate 9.68%   10.15%
Fees collected for servicing of mortgage loans $ 6,400,000 $ 4,900,000  
Mortgage Servicing Rights [Member] | Minimum
     
Valuation servicing rights in tranches [Line Items]      
Average cap rate 0.75%   0.79%
Mortgage Servicing Rights [Member] | Maximum
     
Valuation servicing rights in tranches [Line Items]      
Average cap rate 1.39%   1.39%