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v3.22.2

Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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 | $ 342,500 |  | $ 342,500 |  |  | $ 350,500 |  |
Texas Leading Index economic condition indicator | 138.4 |  | 138.4 |  |  | 135.9 |  |
Financing Receivable, Allowance for Credit Loss | $ 239,632 |  | $ 239,632 |  |  | $ 248,666 |  |
Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total energy loans to total loans | 5.90% |  | 5.90% |  |  |  |  |
Percentage of total energy loans to total loans excluding PPP Loans | 5.90% |  | 5.90% |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 16,267 | $ 28,010 | $ 16,267 | $ 28,010 | $ 15,422 | 17,217 | $ 33,472 | $ 39,553
Paycheck Protection Program [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | 0 | 0 | 0 | 0 |  | 0 |  |
Non Accrual Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Additional interest that would have been recognized on non-accrual loans, net of tax | 436 | $ 427 | 843 | $ 881 |  |  |  |
Commitments to Extend Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Unfunded balances | 887,300 |  | 887,300 |  |  |  |  |
Standby Letters of Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Unfunded balances | 79,100 |  | 79,100 |  |  |  |  |
Loans Receivable [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Interest Receivable | $ 44,800 |  | $ 44,800 |  |  | $ 40,000 |  |

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