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Goodwill, Core Deposit Intangibles and Other Intangible Assets (Mortgage Loans Servicing) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill, Core Deposit Premium and Other Intangible Assets [Abstract]      
Mortgage loans serviced for others $ 3,050,000,000 $ 2,200,000,000  
Custodial escrow balances maintained 12,800,000 10,000,000  
Valuation servicing rights in tranches [Line Items]      
Servicing asset at amortized value, fair value 32,000,000 16,000,000  
Valuation allowance for impairment of recognized servicing assets 0 496,000  
Servicing asset at amortized cost 21,788,000 15,653,000 11,276,000
Mortgage Servicing Rights 30-year Tranche
     
Valuation servicing rights in tranches [Line Items]      
Servicing asset at amortized value, fair value 23,700,000 12,600,000  
Valuation allowance for impairment of recognized servicing assets   496,000  
Servicing asset, agreement term 30 years    
Servicing asset at amortized cost 16,400,000 12,600,000  
Mortgage Servicing Rights 15-year Tranche
     
Valuation servicing rights in tranches [Line Items]      
Servicing asset at amortized value, fair value 4,700,000 3,300,000  
Servicing asset, agreement term 15 years    
Servicing asset at amortized cost 3,100,000 3,000,000  
GNMA
     
Valuation servicing rights in tranches [Line Items]      
Servicing asset at amortized value, fair value 3,500,000    
Servicing asset at amortized cost 2,300,000    
Mortgage Servicing Rights
     
Valuation servicing rights in tranches [Line Items]      
Prepayment rate 9.65% 17.99%  
Discount rate 10.15% 10.06%  
Fees collected for servicing of mortgage loans $ 6,900,000 $ 4,400,000 $ 3,600,000
Minimum | Mortgage Servicing Rights
     
Valuation servicing rights in tranches [Line Items]      
Average cap rate 79.00% 79.00%  
Maximum | Mortgage Servicing Rights
     
Valuation servicing rights in tranches [Line Items]      
Average cap rate 139.00% 107.00%