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Acquisitions - Textual (Details) |  |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2019 $ / shares shares | Apr. 12, 2019 USD ($) shares | Sep. 30, 2019 USD ($) financial_center $ / shares | Oct. 29, 2019 shares | Jun. 30, 2019 USD ($) | Apr. 11, 2019 financial_center | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Stock issued for Reliance acquisition |  |  | $ 144,830,000 |  |  |  |  |
Number of financial centers | financial_center |  |  | 212 |  |  |  |  |
Assets |  |  | $ 17,758,511,000 |  |  |  | $ 16,543,337,000 | $ 15,000,000,000
Net loans |  |  | 12,936,959,000 |  |  |  | 11,666,572,000 |
Deposits |  |  | 13,468,009,000 |  |  |  | 12,398,752,000 |
Goodwill |  |  | $ 926,648,000 |  |  |  | $ 845,687,000 |
Common stock, Class A, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  |  | $ 0.01 |
Reliance Bancshares, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  | 3,999,623 |  |  |  |  |  |
Payments to acquire businesses, gross |  | $ 62,700,000 |  |  |  |  |  |
Stock issued for Reliance acquisition |  | 42,000,000.0 |  |  |  |  |  |
Number of financial centers | financial_center |  |  |  |  |  | 22 |  |
Assets |  | 1,500,000,000 |  |  |  |  |  |
Net loans |  | 1,100,000,000 |  |  |  |  |  |
Deposits |  | 1,200,000,000 |  |  |  |  |  |
Goodwill |  | $ 80,961,000 |  |  | $ 81,000,000.0 |  |  |
Landrum Company |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 17,350,000 |  |  |  |  |  |  |
Number of financial centers | financial_center |  |  | 39 |  |  |  |  |
Assets |  |  | $ 3,300,000,000 |  |  |  |  |
Net loans |  |  | 2,000,000,000.0 |  |  |  |  |
Deposits |  |  | $ 2,900,000,000 |  |  |  |  |
Series A or B Preferred Stock | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Shares issued, conversion ratio (in shares) |  | 1 |  |  |  |  |  |
Series C Preferred Stock | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Shares issued, conversion ratio (in shares) |  | 1 |  |  |  |  |  |
Common Class A | Landrum Company |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common stock, Class A, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |
Preferred Class B | Landrum Company |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Preferred stock, Class B, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |
Subsequent Event | Series C Preferred Stock | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  | 140 |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  | 0 |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  | 0 |  |  |  |

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