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Goodwill and Intangible Assets Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Goodwill and Intangible Assets Gross Carrying Value [Abstract] |  |
Goodwill not subject to amortization (effective 1/1/02) | $ 61,551 | $ 61,551
Total Goodwill And Intangible Assets, Gross Carrying Value | 88,159 | 88,159
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 | 19,038 | 18,521
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 | 19,862
Goodwill and Intangible Assets Accumulated Amortization [Abstract] |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 10,115 | 9,644
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 | $ 2,148 | $ 2,102

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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