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Loans and Asset Quality Information (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Indemnification asset expense $ 5,700 $ 10,300    
Loans pledged as collateral   2,400,000 $ 2,000,000  
Loans to officers and directors   2,600 3,600  
Additions to loans, officers and directors   300    
Repayments of loans, officers and directors   1,300    
Accretion of loan discount   4,451 4,751 $ 16,009
Accretion of discount - covered purchased nonimpaired loans   1,908    
Discount related to purchased nonaccruing loans   795    
Remaining loan discount   11,258    
Payments that exceeded the initial carrying amount on purchased impaired loans   1,160 332  
Discount accretion loan interest income - purchased impaired loans paid off   786 275  
Additional loan interest income - purchased impaired loans paid off   374 57  
Interest income on non accrual loans   266 575 1,176
Interest income on restructured loans   423 1,392 2,003
Consumer loans recategorized from special mention to pass   29,700    
Real estate - mortgage - residential (1-4 family) first mortgages [Member]        
Nonaccrual loans in process of foreclosure   1,700 2,500  
Non Accrual Loans [Member]        
Interest income forgone   1,893 3,213 4,115
Restructured Loans [Member]        
Interest income forgone   $ 1,417 $ 2,044 $ 3,045