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Loans (Narrative) (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Grade Item | Dec. 31, 2019 USD ($) Grade | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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% |  |
Commercial and industrial loans related to overdraft for correspondent bank customer | $ 5,600 | $ 9,000 |  |
Number Of COVID-19 Loan Deferments At Period-End | Item | 39 |  |  |
COVID 19 Loan Deferment | $ 45,900 |  |  |
Financing Receivable, Threshold Period Past Due | 90 days |  |  |
Interest income recognized subsequent to classification as impaired |  | $ 0 | $ 0 |
Number of days past due for payment of interest on loans, minimum | 120 days |  |  |
Texas Leading Index economic condition indicator | 118.3 | 127.1 |  |
Financing Receivable, Allowance for Credit Loss | $ 263,177 | $ 132,167 |  |
Loans Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Accrued interest receivable | $ 48,700 | $ 45,500 |  |
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percentage of total energy loans to total loans | 7.10% | 11.20% |  |
Percentage of total energy loans to total loans excluding PPP Loans | 8.20% |  |  |
Weighted Average Risk Grade | Grade | 6.85 | 6.39 |  |
Financing Receivable, Allowance for Credit Loss | $ 39,553 | $ 37,382 | 29,052 | $ 51,528
Commercial and Industrial Total Energy Loans [Member] | Risk Grade One To Eight [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 5.99 | 5.90 |  |
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 | $ 2,900 | $ 3,900 | 5,200 |
Grade 12 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
General percentage of valuation allowance in excess of principal balance, maximum | 30.00% |  |  |
Grade 13 [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
General percentage of valuation allowance in excess of principal balance, minimum | 30.00% |  |  |
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 6.45 | 6.44 |  |
Financing Receivable, Allowance for Credit Loss | $ 73,843 | $ 51,593 | 48,580 | 59,614
Commercial Portfolio Segment [Member] | Risk Grade One To Eight [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 6.13 | 6.17 |  |
Commercial and Industrial, Other Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of days past due for payment of interest on loans, minimum | 180 days |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 7.32 | 7.07 |  |
Financing Receivable, Allowance for Credit Loss | $ 134,892 | $ 31,037 | 38,777 | 30,948
Commercial Real Estate Portfolio Segment [Member] | Risk Grade One To Eight [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade |  | 6.88 |  |
Commercial Real Estate Buildings Land And Other Financing Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 7.34 | 7.01 |  |
Commercial Real Estate Buildings Land And Other Financing Receivable [Member] | Risk Grade One To Eight [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 6.97 | 6.78 |  |
Construction Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 7.22 | 7.31 |  |
Construction Loans [Member] | Risk Grade One To Eight [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Weighted Average Risk Grade | Grade | 6.99 | 7.25 |  |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 6,963 | $ 8,042 | $ 9,620 | $ 7,617
Paycheck Protection Program [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 0 |  |  |
Commitments to Extend Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Unfunded balances | 919,100 |  |  |
Standby Letters of Credit [Member] | Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Unfunded balances | $ 60,700 |  |  |

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