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Acquisitions - Textual (Details) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended |  |  |  |  |  |  |
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Oct. 31, 2019 USD ($) $ / shares shares | Apr. 12, 2019 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) financial_center $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Oct. 30, 2019 USD ($) financial_center | Oct. 29, 2019 $ / shares shares | Apr. 11, 2019 USD ($) financial_center | Feb. 12, 2019 shares | Feb. 27, 2009 $ / shares shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  | $ 0.01
Number of financial centers | financial_center |  |  |  | 226 |  |  |  |  |  |
Goodwill |  |  |  | $ 1,075,305 | $ 1,055,520 |  |  |  |  |
Stock issued for Reliance acquisition – 3,999,623 shares |  |  | $ 144,830 |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  | 40,040,000 | 40,040,000 |  |  |  |  | 40,040,000
Preferred stock, shares issued (in shares) | shares |  |  |  | 767 | 767 |  |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  | 767 | 767 |  |  |  |  |
Landrum Company |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 17,349,722 |  |  |  |  |  |  |  |  |
Number of financial centers | financial_center |  |  |  |  |  | 39 |  |  |  |
Assets acquired | $ 3,399,152 |  |  |  |  | $ 3,381,889 |  |  |  |
Loans acquired | 2,005,486 |  |  |  |  | 2,049,137 |  |  |  |
Deposits acquired | 3,049,600 |  |  |  |  | 3,049,301 |  |  |  |
Goodwill | $ 151,125 |  |  |  | $ 131,300 | $ 407 |  |  |  |
Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares |  | 3,999,623 |  |  |  |  |  |  |  |
Number of financial centers | financial_center |  |  |  |  |  |  |  | 22 |  |
Assets acquired |  | $ 1,534,312 |  |  |  |  |  | $ 1,549,954 |  |
Loans acquired |  | 1,096,870 |  |  |  |  |  | 1,138,527 |  |
Deposits acquired |  | 1,225,267 |  |  |  |  |  | $ 1,227,058 |  |
Goodwill |  | 78,493 |  |  | $ 78,500 |  |  |  |  |
Payments to acquire businesses, gross |  | 62,700 |  |  |  |  |  |  |  |
Stock issued for Reliance acquisition – 3,999,623 shares |  | $ 42,000 |  |  |  |  |  |  |  |
Common Class A | Landrum Company |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |
Preferred Class B | Landrum Company |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |
Series E Preferred Stock | Landrum Company |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued, conversion ratio (in shares) | 17,350,000 |  |  |  |  |  |  |  |  |
Series D Preferred Stock | Landrum Company |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |
Shares issued, conversion ratio (in shares) | 1 |  |  |  |  |  |  |  |  |
Series D Preferred Stock | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.01 |  |  |
Preferred Stock | Landrum Company |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | shares | 767 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  |  |  | 140 |  | 140 |
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  | 0 |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  |  |  | 0 |  |  |

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