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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended | 17 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 21, 2019 | Sep. 23, 2019 | Sep. 21, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Oct. 18, 2019 | Jan. 01, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock shares |  |  |  | 4,000,000.0 | 900,000 |  |  |
Treasury stock, Cost basis |  |  |  | $ 135,800 | $ 18,500 |  |  |
Payments for repurchase of common stock |  |  |  | $ 185,000 | $ 8,267 |  |  |
Shares repurchased |  |  |  | 3,611,870 |  |  |  |
Minimum risk-based capital ratio |  |  |  | 8.00% | 8.00% |  |  |
Minimum Tier 1 common equity |  |  |  | 4.50% | 4.50% |  |  |
Minimum Tier 1 capital ratio |  |  |  | 6.00% | 6.00% |  |  |
Minimum Tier 1 leverage capital ratio |  |  |  | 4.00% | 4.00% |  |  |
Well capitalized total risk based capital ratio |  |  |  | 10.00% | 10.00% |  |  |
Well capitalized Tier 1 common equity |  |  |  | 6.50% | 6.50% |  |  |
Well capitalized Tier 1 risk-based capital ratio |  |  |  | 8.00% | 8.00% |  |  |
Well capitalized Tier 1 leverage capital ratio |  |  |  | 5.00% | 5.00% |  |  |
Minimum requirement of capital conservation buffer ratio |  |  |  |  |  |  |  | 2.50%
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% |  |  |
Accelerated Share Repurchase Agreement | Common Stock [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Share repurchase, authorized amount |  |  |  |  |  |  | $ 185,000 |
Payments for repurchase of common stock | $ 185,000 |  |  |  |  |  |  |
Shares repurchased | 3,611,870 |  |  |  |  |  |  |
Percentage of shares repurchased among authorized | 75.00% |  |  |  |  |  |  |
Treasury stock, value | $ 138,800 |  |  |  |  |  |  |
Repurchased shares treated as forward contract for final settlement value | $ 46,200 |  |  |  |  |  |  |
2018 Stock Buyback Program [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized for repurchase |  | 5,500,000 |  |  |  |  |  |
Stock repurchase expiration date |  | Dec. 31, 2020 |  |  |  |  |  |
Shares repurchased |  |  |  |  |  | 200,000 |  |
Shares purchased price per share |  |  |  |  |  | $ 41.30 |  |
MidSouth [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Business combination, number of common stock issued |  |  | 5,044,332,000,000 | 5,000,000.0 |  |  |  |
Business combination, common stock value |  |  | $ 193,800 | $ 193,800 |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares nonvested |  |  |  | 1,400,000 | 1,300,000 |  |  |

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