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Goodwill and Intangible Assets Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Gross Carrying Value [Abstract]    
Goodwill not subject to amortization (effective 1/1/02) $ 108,752 $ 109,037
Total Goodwill And Intangible Assets, Gross Carrying Value 160,151 160,436
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 27,259 23,440
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 32,355 32,355
Goodwill and Intangible Assets Accumulated Amortization [Abstract]    
Finite-Lived Intangible Assets, Accumulated Amortization 16,884 14,017
Customer Lists [Member]    
Goodwill and Intangible Assets Gross Carrying Value [Abstract]    
Finite-Lived Intangible Assets, Gross 16,029 16,029
Goodwill and Intangible Assets Accumulated Amortization [Abstract]    
Finite-Lived Intangible Assets, Accumulated Amortization $ 3,600 $ 2,648