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v3.22.1

Loans - Additional Information (Detail) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 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% |  |  |
Maximum percentage loan related to single industry | 10.00% |  |  |
U.S. dollar denominated loans and commitments to borrowers in Mexico | $ 0 |  | $ 0 |
Loans and Leases Receivable, Related Parties | 346,500 |  | $ 350,500 |
Loans modified as troubled debt restructurings | $ 0 | $ 0 |  |
Texas Leading Index economic condition indicator | 141.2 |  | 135.9 |
Financing Receivable, Allowance for Credit Loss | $ 246,835 |  | $ 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 | 6.30% |  |  |
Percentage of total energy loans to total loans excluding PPP Loans | 6.30% |  |  |
Financing Receivable, Allowance for Credit Loss | $ 15,422 | 33,472 | 17,217 | $ 39,553
Paycheck Protection Program [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 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 | 407 | $ 453 |  |
Commitments to Extend Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Unfunded balances | 862,200 |  |  |
Standby Letters of Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Unfunded balances | 76,000 |  |  |
Loans Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Interest Receivable | $ 39,500 |  | $ 40,000 |

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