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Goodwill and Intangible Assets Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Goodwill and Intangible Assets Gross Carrying Value [Abstract] |  |
Goodwill not subject to amortization (effective 1/1/02) | $ 108,752 | $ 108,752
Total Goodwill And Intangible Assets, Gross Carrying Value | 160,511 | 160,251
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 | 29,608 | 28,438
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 | 18,589 | 17,746
Customer Lists [Member] |  |
Goodwill and Intangible Assets Gross Carrying Value [Abstract] |  |
Finite-Lived Intangible Assets, Gross | 16,389 | 16,129
Goodwill and Intangible Assets Accumulated Amortization [Abstract] |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 4,244 | $ 3,917

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