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Acquisitions - Narrative (Details) |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |
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Nov. 19, 2021 USD ($) loan shares | Oct. 08, 2021 USD ($) branch shares | Oct. 31, 2019 USD ($) $ / shares shares | Apr. 12, 2019 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) center | Nov. 17, 2021 $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Oct. 30, 2019 USD ($) branch | Oct. 29, 2019 $ / shares shares | Apr. 11, 2019 USD ($) branch | Feb. 27, 2009 $ / shares shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 1,146,007,000 |  | $ 1,075,305,000 |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01
Number of financial centers | center |  |  |  |  |  | 199 |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  |  |  |  | 40,040,000 |  |  |  | 40,040,000
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  |  | 767 |  |  |  |
Landmark Community Bank |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable (in shares) | shares |  | 4,499,872 |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  | $ 138,200,000 |  |  |  |  |  |  |  |  |  |
Stock issued for acquisition |  | $ 6,451,727,430 |  |  |  |  |  |  |  |  |  |
Number of bank branches acquired | branch |  | 8 |  |  |  |  |  |  |  |  |  |
Assets acquired |  | $ 968,500,000 | $ 968,493,000 |  |  |  |  |  | $ 966,006,000 |  |  |
Loans acquired |  | 789,300,000 | 789,318,000 |  |  |  |  |  | 785,551,000 |  |  |
Deposits acquired |  | 802,700,000 | 802,671,000 |  |  |  |  |  | 803,005,000 |  |  |
Goodwill |  | $ 31,700,000 | 31,733,000 |  |  |  |  |  |  |  |  |
Triumph Bancshares, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable (in shares) | shares |  | 4,164,712 |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  | $ 127,900,000 |  |  |  |  |  |  |  |  |  |
Stock issued for acquisition |  | $ 1,693,402,930 |  |  |  |  |  |  |  |  |  |
Number of bank branches acquired | branch |  | 6 |  |  |  |  |  |  |  |  |  |
Assets acquired |  | $ 848,200,000 | 848,201,000 |  |  |  |  |  | 845,523,000 |  |  |
Loans acquired |  | 700,400,000 | 700,440,000 |  |  |  |  |  | 702,460,000 |  |  |
Deposits acquired |  | 719,700,000 | 719,734,000 |  |  |  |  |  | 718,640,000 |  |  |
Goodwill |  | $ 39,000,000 | $ 38,968,000 |  |  |  |  |  |  |  |  |
Landrum Company |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable (in shares) | shares |  |  | 17,349,722 |  |  |  |  |  |  |  |  |
Stock issued for acquisition |  |  |  |  | $ 415,772,000 |  |  |  |  |  |  |
Assets acquired |  |  | $ 3,399,152,000 |  |  |  |  |  | 3,381,889,000 |  |  |
Loans acquired |  |  | 2,005,486,000 |  |  |  |  |  | 2,049,137,000 |  |  |
Deposits acquired |  |  | 3,049,600,000 |  |  |  |  |  | $ 3,049,301,000 |  |  |
Goodwill |  |  | $ 151,125,000 |  | 131,300,000 |  |  |  |  |  |  |
Number of financial centers | branch |  |  |  |  |  |  |  |  | 39 |  |  |
Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable (in shares) | shares |  |  |  | 3,999,623 |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  |  |  | $ 62,700,000 |  |  |  |  |  |  |  |
Stock issued for acquisition |  |  |  | 42,000,000 | 144,830,000 |  |  |  |  |  |  |
Assets acquired |  |  |  | 1,534,312,000 |  |  |  |  |  |  | $ 1,549,954,000 |
Loans acquired |  |  |  | 1,096,870,000 |  |  |  |  |  |  | 1,138,527,000 |
Deposits acquired |  |  |  | 1,225,267,000 |  |  |  |  |  |  | $ 1,227,058,000 |
Goodwill |  |  |  | $ 78,493,000 | $ 78,500,000 |  |  |  |  |  |  |
Number of financial centers | branch |  |  |  |  |  |  |  |  |  |  | 22 |
Spirit of Texas Bancshares, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable (in shares) | shares | 18,325,000 |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, gross | $ 581,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of bank branches acquired | loan | 37 |  |  |  |  |  |  |  |  |  |  |
Assets acquired | $ 3,300,000,000 |  |  |  |  |  |  |  |  |  |  |
Loans acquired | 2,300,000,000 |  |  |  |  |  |  |  |  |  |  |
Deposits acquired | $ 2,800,000,000 |  |  |  |  |  |  |  |  |  |  |
Closing price of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 31.73 |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Share received from merger (in shares) | 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 |  |  |  |  |  |  |  |  |
Equity interest issued or issuable, 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] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable (in shares) | shares |  |  | 767 |  |  |  |  |  |  |  |  |
Series A or B Preferred Stock | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable, conversion ratio (in shares) |  |  |  | 1 |  |  |  |  |  |  |  |
Series C Preferred Stock | Reliance Bancshares, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued or issuable, conversion ratio (in shares) |  |  |  | 1 |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  |  |  |  |  |  | 140 |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 0 |  |

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