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Allowance for Credit Losses, Credit Quality and Other - Additional Information (Detail) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) contract loan | Dec. 31, 2021 USD ($) | Apr. 01, 2022 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Provision for credit losses on loans |  | $ 11,950,000 | $ 50,170,000 | $ 0 |  |
Provision for unfunded commitments |  | (1,500,000) | 11,410,000 | (4,752,000) |  |
Allowance for credit losses on PCD loans |  |  | 16,816,000 |  |  |
Non-accrual loans |  | 59,971,000 | 51,011,000 |  |  |
Loans past due over 90 days still accruing |  | 4,130,000 | 9,845,000 |  |  |
Nonaccrual loans with specific reserve |  | 2,500,000 | 8,400,000 |  |  |
Interest income on nonaccrual loans |  | 0 | 0 | 0 |  |
Collateral-dependent impaired loans |  | 94,900,000 | 221,100,000 |  |  |
Interest recognized on impaired loans |  | 2,500,000 | 9,600,000 | 14,700,000 |  |
Amount of loan assessed for impairment on a quarterly basis |  | 2,000,000 |  |  |  |
Revolver loans converted to term loans |  | $ 69,000,000 | $ 28,300,000 |  |  |
Number of revolving loans convert to term loans | loan |  | 217 | 183 |  |  |
Restructured loans, amount |  | $ 19,500,000 | $ 11,140,000 |  |  |
Number of loans |  | 21 | 44 |  |  |
Loans, ending balance |  | $ 21,000,000 |  |  |  |
Post modification outstanding balance |  | 24,610,000 | $ 5,745,000 |  |  |
Loan balance, nonaccrual |  | 905,000 |  |  |  |
Allowance for credit loss |  | $ 288,234,000 | 289,669,000 | 236,714,000 |  | $ 245,473,000
Three Modified Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Number of loans | loan |  | 3 |  |  |  |
Post modification outstanding balance |  | $ 18,200,000 |  |  |  |
Two Modified Loans | Extended Maturity, Interest Only Payments And Interest Rate Increase |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Number of loans | loan |  | 2 |  |  |  |
Interest only payments, term |  | 36 months |  |  |  |
Term extension |  | 36 months |  |  |  |
Increase in interest rate |  | 0.0009 |  |  |  |
One Modified Loan | Extended Maturity And Interest Rate Increase |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Term extension |  | 49 months |  |  |  |
Increase in interest rate |  | 3.45 |  |  |  |
Increased Loan Growth |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Provision for credit losses on loans |  |  | 5,000,000 |  |  |
Deteriorated Credit Quality | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13 |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit loss |  | $ 130,700,000 | 142,500,000 |  |  |
Happy Bancshares, Inc. |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Provision for credit losses on loans | $ (1,500,000) | 12,000,000 | 11,400,000 |  |  |
Net loan discounts | (4,400,000) |  |  |  |  |
Allowance for credit losses | $ 16,816,000 |  | 16,800,000 |  | $ 42,224,000 |
Provision for credit losses |  |  | 45,200,000 |  |  |
Happy Bancshares, Inc. | Deteriorated Credit Quality | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13 |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit loss |  | 130,400,000 | 142,100,000 |  |  |
LH-Finance | Deteriorated Credit Quality | Cumulative Effect Period of Adoption Adjustment | Accounting Standards Update 2016-13 |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit loss |  | 376,100 | 415,000 |  |  |
Non-current Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans, ending balance |  | 20,100,000 |  |  |  |
Loans Past Due 60-89 Days |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loans, ending balance |  | $ 1,500,000 |  |  |  |
Construction / Land Development and Other Commercial Real Estate Loans | Minimum |  |  |  |  |  |
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 |  |  |  |
Construction / Land Development and Other Commercial Real Estate Loans | Maximum |  |  |  |  |  |
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% |  |  |  |
Residential Real Estate |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses on PCD loans |  |  | 980,000 |  |  |
Allowance for credit loss |  | $ 55,860,000 | 50,963,000 | 48,458,000 |  | 53,216,000
Residential Real Estate | Maximum |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Loan-to-value ratio |  | 90.00% |  |  |  |
Commercial and Industrial Loans |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses on PCD loans |  |  | 5,596,000 |  |  |
Non-accrual loans |  | $ 9,982,000 | 14,920,000 |  |  |
Loans past due over 90 days still accruing |  | 1,535,000 | 6,300,000 |  |  |
Restructured loans, amount |  |  | $ 3,199,000 |  |  |
Number of loans | contract |  |  | 15 |  |  |
Post modification outstanding balance |  | 4,170,000 | $ 951,000 |  |  |
Allowance for credit loss |  | $ 92,810,000 | 89,354,000 | $ 53,062,000 |  | $ 46,530,000
Commercial and Industrial Loans | Minimum |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Commercial loans terms |  | 1 year |  |  |  |
Inventory financing percentage |  | 50.00% |  |  |  |
Commercial and Industrial Loans | Minimum | Accounts Receivable Less than 60 Days Past Due |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Accounts receivable financed percentage |  | 50.00% |  |  |  |
Commercial and Industrial Loans | Maximum |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Commercial loans terms |  | 7 years |  |  |  |
Inventory financing percentage |  | 80.00% |  |  |  |
Commercial and Industrial Loans | Maximum | Accounts Receivable Less than 60 Days Past Due |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Accounts receivable financed percentage |  | 80.00% |  |  |  |
Total real estate |  |  |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |  |  |
Non-accrual loans |  | $ 46,054,000 | 32,557,000 |  |  |
Loans past due over 90 days still accruing |  | 2,516,000 | 3,249,000 |  |  |
Restructured loans, amount |  |  | $ 7,923,000 |  |  |
Number of loans | contract |  |  | 27 |  |  |
Post modification outstanding balance |  | $ 20,410,000 | $ 4,782,000 |  |  |

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