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Acquisitions and Divestitures - Narrative (Details) $ in Thousands |  |  |  |  |  | 3 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2019 USD ($) branch | Nov. 04, 2019 office state directors | Mar. 23, 2018 USD ($) branch | Nov. 30, 2017 USD ($) branch shares | Apr. 03, 2017 USD ($) | Jun. 30, 2018 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  | $ 43,310,900 | $ 40,832,258 |  |  |
Loans |  |  |  |  |  |  |  | 30,860,804 | 27,355,108 |  |  |
Deposits |  |  |  |  |  |  |  | 32,429,535 | 32,682,992 |  |  |
Goodwill |  |  |  |  |  |  |  | 1,432,787 | 1,432,787 | $ 1,386,853 | $ 191,371 |
Goodwill expected to be tax deductible |  |  |  | $ 17,000 |  |  |  |  |  |  |  |
Noninterest expense |  |  |  |  |  |  |  | 1,210,187 | 1,220,317 | 842,314 |  |
IBERIABANK Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion price of shares |  | 4.584 |  |  |  |  |  |  |  |  |  |
Conversion percentage of shares |  | 44.00% |  |  |  |  |  |  |  |  |  |
Number of board of directors | directors |  | 17 |  |  |  |  |  |  |  |  |  |
SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 30 |  |  |  |  |  |  |  |  |  |  |
Deposits | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |
Deposits premium percent | 3.40% |  |  |  |  |  |  |  |  |  |  |
Loans | $ 410,000 |  |  |  |  |  |  |  |  |  |  |
Capital Bank Financial Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of bank branches | branch |  |  |  | 178 |  |  |  |  |  |  |  |
Deposits |  |  |  | $ 8,140,102 |  |  |  |  |  |  |  |
Loans |  |  |  | $ 7,276,544 |  |  |  |  |  |  |  |
Equity interest issued, number of shares (in shares) | shares |  |  |  | 92,042,232 |  |  |  |  |  |  |  |
Payments to acquire business |  |  |  | $ 423,600 |  | $ 46,000 | $ 469,615 |  |  |  |  |
Total consideration paid |  |  |  | 2,216,333 |  |  |  |  |  |  |  |
Number of shares canceled (in shares) | shares |  |  |  |  |  | 2,373,220 |  |  |  |  |  |
Assets acquired |  |  |  | 9,833,737 |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  | 1,193,393 |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,192,839 |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  | 10 years |  |  |  |  |  |  |  |
Coastal Securities, Inc |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business |  |  |  |  | $ 131,473 |  |  |  |  |  |  |
Assets acquired |  |  |  |  | 418,418 |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 44,964 |  |  |  |  |  |  |
IBERIABANK DIRECTORS |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of board of directors | directors |  | 8 |  |  |  |  |  |  |  |  |  |
FHN DIRECTORS | IBERIABANK Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of board of directors | directors |  | 9 |  |  |  |  |  |  |  |  |  |
Apex Bank |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of branches divested | branch |  |  | 2 |  |  |  |  |  |  |  |  |
Savings classified as held for sale |  |  | $ 30,000 |  |  |  |  |  |  |  |  |
Loans disposed of |  |  | $ 2,000 |  |  |  |  |  |  |  |  |
Portion of Sub-prime Auto Loan Portfolios |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans disposed of |  |  |  |  |  | $ 120,000 | $ 120,000 |  | $ 120,000 |  |  |
Discontinued Operations, Held-for-sale | Subprime Consumer Loans |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans disposed of |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
Amortization Of Premiums And Accretion Of Discounts | Capital Bank Financial Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noninterest expense |  |  |  |  |  |  |  |  |  | 34,500 | 46,500 |
Eliminate Amortization Of Premiums And Accretion Of Discounts | Capital Bank Financial Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noninterest expense |  |  |  |  |  |  |  |  |  | 24,400 | 25,900 |
Amortization Of Acquired Intangibles | Capital Bank Financial Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noninterest expense |  |  |  |  |  |  |  |  |  | $ 15,800 | $ 18,000 |
IBERIABANK Corporation |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of offices | office |  | 319 |  |  |  |  |  |  |  |  |  |
Number of states | state |  | 12 |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  | 31,700,000 |  |  |  |
Loans |  |  |  |  |  |  |  | 24,000,000 |  |  |  |
Deposits |  |  |  |  |  |  |  | $ 25,200,000 |  |  |  |
NORTH CAROLINA | SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 20 |  |  |  |  |  |  |  |  |  |  |
VIRGINIA | SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 8 |  |  |  |  |  |  |  |  |  |  |
GEORGIA | SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 2 |  |  |  |  |  |  |  |  |  |  |

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