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Goodwill and Other Intangible Assets (Carrying Value of Intangible Assets Subject to Amortization) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | $ 307,417 | $ 275,917
Accumulated Amortization | 200,610 | 179,766
Carrying Value | 106,807 | 96,151
Core Deposit Intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | 247,455 | 215,955
Accumulated Amortization | 168,577 | 151,446
Carrying Value | 78,878 | 64,509
Credit Card and Trust Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | 49,962 | 49,962
Accumulated Amortization | 22,448 | 19,564
Carrying Value | 27,514 | 30,398
Merchant Processing Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchase Value | 10,000 | 10,000
Accumulated Amortization | 9,585 | 8,756
Carrying Value | $ 415 | $ 1,244

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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/disclosureRef -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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