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Goodwill and Intangible Assets Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Gross Carrying Value [Abstract]    
Goodwill not subject to amortization (effective 1/1/02) $ 61,551 $ 44,767
Total Goodwill And Intangible Assets, Gross Carrying Value 89,219 66,715
Goodwill and Intangible Assets Accumulated Amortization [Abstract]    
Goodwill not subject to amortization (effective 1/1/02) 3,760 3,760
Total Goodwill and Intangible Assets, Accumulated Amortization 18,010 16,711
Intangibles from branch acquisition    
Goodwill and Intangible Assets Gross Carrying Value [Abstract]    
Finite-Lived Intangible Assets, Gross 3,015 3,015
Goodwill and Intangible Assets Accumulated Amortization [Abstract]    
Finite-Lived Intangible Assets, Accumulated Amortization 3,015 3,015
Core Deposits [Member]    
Goodwill and Intangible Assets Gross Carrying Value [Abstract]    
Finite-Lived Intangible Assets, Gross 19,862 15,202
Goodwill and Intangible Assets Accumulated Amortization [Abstract]    
Finite-Lived Intangible Assets, Accumulated Amortization 9,180 8,017
Customer Lists [Member]    
Goodwill and Intangible Assets Gross Carrying Value [Abstract]    
Finite-Lived Intangible Assets, Gross 3,731 3,731
Goodwill and Intangible Assets Accumulated Amortization [Abstract]    
Finite-Lived Intangible Assets, Accumulated Amortization 2,055 1,919
Mortgage Servicing Rights [Member]    
Goodwill and Intangible Assets Gross Carrying Value [Abstract]    
Finite-Lived Intangible Assets, Gross $ 1,060 $ 0