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Allowance for Credit Losses, Credit Quality and Other - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Apr. 01, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses on loans |  |  | $ 48,400,000 | $ 11,950,000 | $ 50,170,000 |  |  |
(Recovery of) provision for credit losses on unfunded commitments | $ 1,000,000 | $ 1,000,000 | 0 | (1,500,000) | 11,410,000 |  |  |
Nonaccrual |  |  | 93,853,000 | 59,971,000 |  |  |  |
Loans Past Due Over 90 Days Still Accruing |  |  | 5,034,000 | 4,130,000 |  |  |  |
Nonaccrual loans with specific reserve |  |  | 28,800,000 | 2,500,000 |  |  |  |
Interest income on nonaccrual loans |  |  | 0 | 0 | 0 |  |  |
Amortized cost |  |  | 268,000,000.0 | 94,900,000 |  |  |  |
Financing receivable, individually evaluated for credit loss, interest income |  |  | 13,500,000 | 2,500,000 | 9,600,000 |  |  |
Amount of loan assessed for impairment on a quarterly basis |  |  | 2,000,000.0 |  |  |  |  |
Revolver loans converted to term loans |  |  | $ 55,000,000.0 | $ 69,000,000.0 |  |  |  |
Number of revolving loans convert to term loans | loan |  |  | 213 | 217 |  |  |  |
Number of loans | loan |  |  | 13 |  |  |  |  |
Loans, ending balance |  |  | $ 100,500,000 |  |  |  |  |
Financing receivable, modified in period, amount |  |  | $ 122,675,000 | $ 24,610,000 |  |  |  |
Financing receivable, modifications, underwritten the interest rate basis points |  |  | 0.0012 |  |  |  |  |
Loans payable |  |  | $ 114,700,000 |  |  |  |  |
Financing receivable, modified specific reserve |  |  | 2,900,000 |  |  |  |  |
Financial receivable, excluding accrued interest, modified in period, premodification |  |  | 134,400,000 |  |  |  |  |
Loan balance, nonaccrual |  |  | 256,190 |  |  |  |  |
Allowance for credit loss |  |  | 275,880,000 | 288,234,000 | 289,669,000 |  |  | $ 236,714,000
Hurricane expense |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses on loans |  |  | 33,400,000 |  |  |  |  |
Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13 | Deteriorated Credit Quality |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss |  |  | 76,300,000 | 130,700,000 |  |  |  |
13 Modified Loan Borrowers |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Financial receivable, excluding accrued interest, modified in period, premodification |  |  | $ 108,400,000 |  |  |  |  |
Three Modified Loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan |  |  | 3 |  |  |  |  |
Financing receivable, modified in period, amount |  |  | $ 99,100,000 |  |  |  |  |
One Loan Charged-Off |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan |  |  | 1 |  |  |  |  |
Financing receivable, modified ,one of loans charged off |  |  | $ 26,100,000 |  |  |  |  |
Three New Loans Underwritten |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan |  |  | 3 |  |  |  |  |
Modified Loans Collateral Dependent |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan |  |  | 5 |  |  |  |  |
Happy Bancshares, Inc. |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses on loans |  |  |  |  | 11,400,000 |  |  |
Net loan discounts |  |  |  |  |  | $ 4,400,000 |  |
Allowance for credit losses |  |  |  |  | 16,800,000 | $ 16,816,000 | $ 42,224,000 |
Provision for credit losses |  |  |  |  | 45,200,000 |  |  |
Happy Bancshares, Inc. | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13 | Deteriorated Credit Quality |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss |  |  | $ 76,300,000 | 130,400,000 |  |  |  |
LH-Finance | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13 | Deteriorated Credit Quality |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss |  |  |  | 376,100 |  |  |  |
Increased Loan Growth | Happy Bancshares, Inc. |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Provision for credit losses on loans |  |  |  |  | 5,000,000 |  |  |
Total Past Due |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans, ending balance |  |  | 100,200,000 |  |  |  |  |
Residential Real Estate |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss |  |  | 50,835,000 | 55,860,000 | 50,963,000 |  |  | 48,458,000
Commercial & Industrial |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Nonaccrual |  |  | 10,931,000 | 9,982,000 |  |  |  |
Loans Past Due Over 90 Days Still Accruing |  |  | 2,263,000 | 1,535,000 |  |  |  |
Financing receivable, modified in period, amount |  |  | 69,871,000 | 4,170,000 |  |  |  |
Allowance for credit loss |  |  | $ 49,621,000 | $ 92,810,000 | $ 89,354,000 |  |  | $ 53,062,000
Minimum | Construction / Land Development and Other Commercial Real Estate Loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans collateralized by first liens on real estate amortized period |  |  | 15 years |  |  |  |  |
Loans collateralized by first liens on real estate balloon payments due period |  |  | 1 year |  |  |  |  |
Minimum | Commercial & Industrial |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Commercial loans terms |  |  | 1 year |  |  |  |  |
Inventory financing percentage |  |  | 50.00% |  |  |  |  |
Minimum | Commercial & Industrial | Loans Past Due 30-59 Days |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Accounts receivable financed percentage |  |  | 50.00% |  |  |  |  |
Maximum | Construction / Land Development and Other Commercial Real Estate Loans |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loans collateralized by first liens on real estate amortized period |  |  | 30 years |  |  |  |  |
Loans collateralized by first liens on real estate balloon payments due period |  |  | 5 years |  |  |  |  |
Percentage of loan value of improved property |  |  | 85.00% |  |  |  |  |
Percentage of loan value of raw land |  |  | 65.00% |  |  |  |  |
Percentage of loan value of land to be acquired and developed |  |  | 75.00% |  |  |  |  |
Maximum | Residential Real Estate |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Loan-to-value ratio |  |  | 90.00% |  |  |  |  |
Maximum | Commercial & Industrial |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Commercial loans terms |  |  | 7 years |  |  |  |  |
Inventory financing percentage |  |  | 80.00% |  |  |  |  |
Maximum | Commercial & Industrial | Loans Past Due 30-59 Days |  |  |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |  |  |
Accounts receivable financed percentage |  |  | 80.00% |  |  |  |  |

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