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Loans and Allowance for Credit Losses - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) Asset | Dec. 31, 2023 USD ($) Asset | Dec. 31, 2022 USD ($) Asset | Mar. 31, 2023 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan purchase discounts | $ 35,200,000 |  |  |
Loans held for sale | 10,700,000 |  |  |
Loans | $ 21,797,404,000 | $ 20,848,176,000 |  |
Percentage of Loans Related to Single Industry on Loans | 10.00% | 10.00% |  |
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans | 81.30% | 83.00% |  |
Loans and Leases Receivable, Related Parties | $ 266,000 | $ 292,000 | $ 547,000 |
Loans held for investment | $ 21,057,616,000 | $ 20,352,559,000 |  |
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate | 0.37% | 0.34% | 0.15% |
Nonperforming assets, number of credits or other real estate properties | Asset | 368 |  |  |
Loans and leases receivable, nonaccrual loans | $ 73,600,000 | $ 68,700,000 | $ 19,600,000 |
Financing Receivable, Allowance for Credit Losses on Loans | $ 351,800,000 | $ 332,400,000 |  |
Allowance for Credit Losses as Percentage of Loans | 1.59% | 1.57% |  |
Increase in allowance for credit losses for loans | $ 19,400,000 |  |  |
Increase in allowance for credit losses for loans, percentage | 5.80% |  |  |
Provision for credit losses | $ 9,066,000 | $ 18,540,000 | 0 |
Net charge-offs | 14,558,000 | 37,991,000 | 4,804,000 |
General reserve | 15,400,000 |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,646,000 | 36,503,000 | 29,947,000 |
Commitments expected to fund | 1,720,000,000 |  |  |
Nonaccrual loans | 73,647,000 | 68,688,000 |  |
First Bancshares of Texas, Inc. [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans |  |  |  | $ 1,650,000,000
Provision for credit losses |  | 12,000,000 |  |
Merger [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Net charge-offs | 26,100,000 |  |  |
LSSB Merger [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Provision for credit losses | 7,900,000 |  |  |
Troubled Debt Restructuring [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,600,000 | 36,500,000 |  |
Troubled Debt Restructuring [Member] | First Bancshares of Texas, Inc. [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Provision for credit losses |  | 6,500,000 |  |
Troubled Debt Restructuring [Member] | LSSB Merger [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Provision for credit losses | 1,200,000 |  |  |
PCD Loans [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Net charge-offs | 3,400,000 |  |  |
Nonperforming Financial Instruments [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans held for investment | $ 81,500,000 | $ 72,700,000 | $ 27,500,000 |
Nonperforming assets, number of credits or other real estate properties | Asset |  | 292 | 170 |
Warehouse Purchase Program [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Participation interest in mortgage loans acquired percentage | 100.00% |  |  |
Loans | $ 1,080,000.00 |  |  |
Loans held for investment | $ 1,080,903,000 | $ 822,245,000 |  |
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan collateralized | 89.00% |  |  |
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loans held for investment | $ 5,800,985,000 | 5,662,948,000 |  |
Net charge-offs | 222,000 | 17,116,000 | $ 860,000 |
Nonaccrual loans | $ 18,455,000 | $ 18,662,000 |  |
Real Estate [Member] | FHA and VA Loans [Member] | 1-4 Family Residential (Includes Home Equity) [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Debt instrument, term | 30 years |  |  |
Minimum [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan evaluation by loan concurrence officers | $ 1,000,000 |  |  |
Minimum [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Debt instrument, term | 12 months |  |  |
Minimum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Debt instrument, term | 5 years |  |  |
Minimum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Debt instrument, term | 15 years |  |  |
Maximum [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Loan evaluation by loan concurrence officers | $ 5,000,000 |  |  |
Maximum [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Debt instrument, term | 180 months |  |  |
Maximum [Member] | Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Debt instrument, term | 30 years |  |  |
Maximum [Member] | Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |
Period of fixed interest | 5 years |  |  |
Debt instrument, term | 25 years |  |  |

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