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Acquisitions- Textual (Details) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 19, 2021 USD ($) branch shares | Oct. 08, 2021 USD ($) branch shares | Sep. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 20, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Stock issued for acquisition |  |  | $ 464,918,000 |  |
Goodwill |  |  | $ 1,309,000,000 | $ 1,146,007,000 |
Spirit of Texas Bancshares, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares issued (in shares) | shares | 18,275,074 |  |  |  |
Payments to acquire businesses, gross | $ 464,900,000 |  |  |  |
Stock issued for acquisition | $ 1,393,508,900 |  |  |  |
Number of bank branches acquired | branch | 35 |  |  |  |
Assets acquired, after acquisition method adjustments | $ 3,120,000,000 |  |  |  |
Loans acquired, after acquisition method adjustments | 2,290,000,000 |  |  |  |
Customer deposits acquired, after acquisition method adjustments | 2,720,000,000 |  |  |  |
Goodwill | 162,300,000 |  |  |  | $ 162,347,000
Assets acquired | 3,200,312,000 |  |  |  | 3,118,149,000
Loans acquired | 2,314,085,000 |  |  |  | 2,294,160,000
Deposits acquired | $ 2,718,100,000 |  |  |  | $ 2,719,016,000
Landmark Community Bank |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares issued (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 |  |  |
Goodwill |  | $ 31,400,000 |  |  |
Assets acquired |  | 968,800,000 |  |  |
Loans acquired |  | 789,500,000 |  |  |
Deposits acquired |  | $ 802,700,000 |  |  |
Triumph Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Shares issued (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 |  |  |
Goodwill |  | $ 39,900,000 |  |  |
Assets acquired |  | 847,200,000 |  |  |
Loans acquired |  | 698,800,000 |  |  |
Deposits acquired |  | $ 719,700,000 |  |  |

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