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Acquisitions and Divestitures (Narrative) (Details) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) branch shares | Apr. 03, 2017 USD ($) | Oct. 02, 2015 USD ($) branch shares | Oct. 31, 2017 professional | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 16, 2016 USD ($) | Dec. 31, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill (Note 7) |  |  |  |  | $ 1,386,853 | $ 191,371 | $ 191,307 |  | $ 145,932
Net interest income |  |  |  |  | 842,314 | 729,084 | 653,720 |  |
Noninterest expense |  |  |  |  | 1,023,661 | 925,204 | $ 1,053,791 |  |
Total assets |  |  |  |  | 41,423,388 | 28,555,231 |  |  |
Capital Bank Financial Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity interest issued, number of shares | shares | 92,043,171 |  |  |  |  |  |  |  |
Payments to acquire business | $ 423,592 |  |  |  |  |  |  |  |
Total consideration paid | $ 2,216,351 |  |  |  |  |  |  |  |
Number of bank branches operated | branch | 178 |  |  |  |  |  |  |  |
Goodwill (Note 7) | $ 1,146,901 |  |  |  |  |  |  |  |
Goodwill expected to be tax deductible | $ 17,000 |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |  |  |  |  |  |  |  |
Acquisition-related expenses | $ 1,000 |  |  |  |  |  |  |  |
Capital Bank Financial Corporation | Amortization Of Premiums And Accretion Of Discounts |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  | (34,500) | (46,500) |  |  |
Capital Bank Financial Corporation | Eliminate Amortization Of Premiums And Accretion Of Discounts |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  | 24,400 | 25,900 |  |  |
Capital Bank Financial Corporation | Amortization Of Acquired Intangibles |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Noninterest expense |  |  |  |  | $ 15,800 | $ 18,000 |  |  |
Coastal Securities, Inc |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire business |  | $ 131,473 |  |  |  |  |  |  |
Goodwill (Note 7) |  | $ 44,964 |  |  |  |  |  |  |
GE Capital |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loans acquired |  |  |  |  |  |  |  | $ 537,400 |
Trust Atlantic Financial Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity interest issued, number of shares | shares |  |  | 5,093,657 |  |  |  |  |  |
Payments to acquire business |  |  | $ 23,888 |  |  |  |  |  |
Total consideration paid |  |  | $ 96,679 |  |  |  |  |  |
Number of bank branches operated | branch |  |  | 5 |  |  |  |  |  |
Goodwill (Note 7) |  |  | $ 45,375 |  |  |  |  |  |
Professional Mortgage Company, Inc. (PMC) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of professionals | professional |  |  |  | 11 |  |  |  |  |

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