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Goodwill, Core Deposit Premium and Other Intangible Assets (Mortgage loans servicing) (Details) - USD ($)
9 Months Ended 12 Months Ended
Jan. 16, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Valuation servicing rights in tranches [Line Items]        
Mortgage loans serviced for others   $ 3,960,000,000   $ 3,500,000,000
Valuation allowance   0   0
Mortgage Servicing Rights        
Valuation servicing rights in tranches [Line Items]        
Servicing asset at amortized value   $ 40,166,000 $ 33,260,000 $ 34,200,000
Prepayment rate   10.79%   11.40%
Discount rate   9.23%   9.20%
Fees collected for servicing of mortgage loans   $ 7,800,000 6,400,000  
Mortgage Servicing Rights | Minimum        
Valuation servicing rights in tranches [Line Items]        
Average cap rate   0.65%   0.75%
Mortgage Servicing Rights | Maximum        
Valuation servicing rights in tranches [Line Items]        
Average cap rate   1.38%   1.39%
Mortgage Servicing Rights 15-year Tranche        
Valuation servicing rights in tranches [Line Items]        
Servicing asset, agreement term   15 years    
Mortgage Servicing Rights 30-year Tranche        
Valuation servicing rights in tranches [Line Items]        
Servicing asset, agreement term   30 years    
Commercial Servicing Rights        
Valuation servicing rights in tranches [Line Items]        
Servicing asset at amortized value   $ 4,412,000 $ 0  
Fees collected for servicing of mortgage loans $ 438,000      
Loans serviced for Small Business Administration and US Department of Agriculture $ 158,800,000