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Goodwill and Other Intangible Assets (Carrying Value of Intangible Assets Subject to Amortization) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | $ 248,355 | $ 223,055
Accumulated Amortization | 157,715 | 135,298
Carrying Value | 90,640 | 87,757
Core Deposit Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | 215,955 | 190,655
Accumulated Amortization | 132,878 | 113,436
Carrying Value | 83,077 | 77,219
Credit Card and Trust Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | 22,400 | 22,400
Accumulated Amortization | 16,882 | 14,907
Carrying Value | 5,518 | 7,493
Merchant Processing Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | 10,000 | 10,000
Accumulated Amortization | 7,955 | 6,955
Carrying Value | $ 2,045 | $ 3,045

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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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- Definition Amount before 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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- Definition Amount after 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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