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v3.25.2

Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Concentration of loans in a single industry in excess of ten percent | 0.00% |  | 0.00% |  |
Maximum percentage loan related to single industry | 10.00% |  | 10.00% |  |
U.S. dollar denominated loans and commitments to borrowers in Mexico | $ 0 |  | $ 0 |  | $ 0
Loans and Leases Receivable, Related Parties | 280,800 |  | 280,800 |  | 295,800
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 19,800,000 |  | 19,800,000 |  | 19,200,000
Federal Home Loan Bank Borrowings, Fair Value Disclosure | 0 |  | 0 |  | 0
Loans, net of unearned discounts | $ 21,254,495 |  | $ 21,254,495 |  | $ 20,754,813
Texas Leading Index economic condition indicator | 126.1 |  | 126.1 |  | 125.3
Combination: Payment Delay and Term Extention |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | $ 0 |  | $ 0 |  |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | $ 62,310 |  | $ 62,310 |  |
Automobile Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of total loans | 5.50% |  | 5.50% |  |
Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage of total loans | 6.20% |  | 6.20% |  |
Loans, net of unearned discounts | $ 1,315,227 |  | $ 1,315,227 |  | $ 1,128,895
Commercial and Industrial Total Energy Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 1,104 |  | 1,104 |  |
Non Accrual Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Impaired Interest Lost On Nonaccrual Loans | 1,300 | $ 1,300 | 2,700 | $ 2,500 |
Total consumer real estate loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 3,339,275 |  | 3,339,275 |  | 3,103,389
Total consumer real estate loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 19,316 |  | 19,316 |  |
Commercial Portfolio Segment [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 6,069,215 |  | 6,069,215 |  | 6,109,532
Commercial Portfolio Segment [Member] | Additional Funding Agreement Terms |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 0 |  | 0 |  |
Commercial Portfolio Segment [Member] | Combination: Payment Delay and Term Extention |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 0 | $ 27,731 | 0 | $ 27,731 |
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 26,553 |  | 26,553 |  |
Consumer Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 437,029 |  | 437,029 |  | 444,474
Consumer Loan [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 4,546 |  | 4,546 |  |
Bank Overdrafts | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Nonperforming Financial Instruments [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 7,600 |  | 7,600 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 3,800 |  | 3,800 |  |
Commercial mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans, net of unearned discounts | 7,472,048 |  | 7,472,048 |  | 7,165,220
Commitments to Extend Credit [Member] | Automobile Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded balances | 519,700 |  | 519,700 |  |
Commitments to Extend Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded balances | 1,100,000 |  | 1,100,000 |  |
Standby Letters of Credit [Member] | Automobile Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded balances | 20,000 |  | 20,000 |  |
Standby Letters of Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Unfunded balances | 67,300 |  | 67,300 |  |
Loans Receivable [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Interest Receivable | $ 88,800 |  | $ 88,800 |  | $ 86,800

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