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Goodwill and Other Intangible Assets (Narrative) (Details) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 27, 2015 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  | $ 621,193 | $ 621,193 |  |
Weighted approach percentage of fair market value of goodwill higher than book value |  |  |  |  | 23.00%
Goodwill impairment charges |  | $ 0 | $ 0 | $ 0 |
Core Deposit Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-average remaining life |  | 9 years |  |  |
Other Identifiable Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-average remaining life |  | 6 years |  |  |
Texas [Member] | Core Deposit Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangibles eliminated in conjunction with sale of branches | $ 1,100 |  |  |  |
Number of branches sold | item | 4 |  |  |  |

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