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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 16, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 28, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of common stock | $ 259,000 |  |  | $ 259,299 |  |
Treasury stock shares |  |  | 1,200,000 | 1,300,000 |  |
Treasury stock, Carry basis |  |  | $ 25,500 | $ 24,100 |  |
Tax computed at statutory rate |  |  | 35.00% | 35.00% | 35.00% |
Reclassification of certain tax effects |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Number of shares nonvested |  |  | 1,500,000 | 2,000,000 |  |
2015 Stock Repurchase Plan [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares authorized for repurchase |  |  |  |  |  | 5.00%
Number of shares authorized for repurchase |  |  |  |  |  | 3,900,000
Stock repurchase plan expiration date |  |  | Sep. 01, 2016 |  |  |
Repurchased common stock shares |  |  | 0 | 0 |  |
Common Stock [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares sold, price per share | $ 41.00 |  |  |  |  |
Shares sold | 6,300,000 |  |  |  |  |
Reclassification of certain tax effects |  |  |  |  |  |
Hancock Holding Company [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 15,312 | $ 262,961 | $ 347 |
Minimum risk-based capital ratio |  |  | 8.00% | 8.00% |  |
Minimum Tier 1 capital ratio |  |  | 6.00% | 6.00% |  |
Minimum Tier 1 leverage capital ratio |  |  | 4.00% | 4.00% |  |
Minimum Tier 1 common equity |  |  | 4.50% | 4.50% |  |
Well capitalized total risk based capital ratio |  |  | 10.00% | 10.00% |  |
Well capitalized Tier 1 risk-based capital ratio |  |  | 8.00% | 8.00% |  |
Well capitalized Tier 1 leverage capital ratio |  |  | 5.00% | 5.00% |  |
Well capitalized Tier 1 common equity |  |  | 6.50% | 6.50% |  |
Bank Holding Companies and Banks that Meet Certain Criteria [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Minimum Tier 1 leverage capital ratio |  |  | 3.00% |  |  |
Scenario, Plan [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Tax computed at statutory rate |  | 21.00% |  |  |  |

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