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Loans - Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 16,596,326 | $ 17,481,309
Total loans percentage | 100.00% | 100.00%
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 4,755,345 | $ 4,955,341
Total commercial and industrial percentage of total loans | 28.70% | 28.40%
Energy Production [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 812,862 | $ 976,473
Percentage of energy production loans to total loans | 4.90% | 5.60%
Energy Service [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 89,153 | $ 116,825
Percentage of energy service loans to total loans | 0.60% | 0.70%
Energy Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 121,187 | $ 141,900
Percentage of other energy loans to total loans | 0.70% | 0.80%
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,023,202 | $ 1,235,198
Percentage of total energy loans to total loans | 6.20% | 7.10%
Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,926,824 | $ 2,433,849
Percentage Of Payment Protection Program Loans To Loans | 11.60% | 13.90%
Commercial mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 5,577,069 | $ 5,478,806
Commercial mortgages percentage of total loans | 33.60% | 31.30%
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,166,309 | $ 1,223,814
Construction percentage of total loans | 7.00% | 7.00%
Commercial land loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 312,668 | $ 317,847
Land percentage of total loans | 1.90% | 1.80%
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 7,056,046 | $ 7,020,467
Total commercial real estate percentage of total loans | 42.50% | 40.10%
Home Equity Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 313,891 | $ 329,390
Home equity loans percentage of total loans | 1.90% | 1.90%
Home Equity Line of Credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 479,099 | $ 452,854
Home equity lines of credit percentage of total loans | 2.90% | 2.60%
Other consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 558,988 | $ 548,530
Other percentage of total loans | 3.30% | 3.10%
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,351,978 | $ 1,330,774
Total consumer real estate percentage of total loans | 8.10% | 7.60%
Real Estate Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 8,408,024 | $ 8,351,241
Total real estate percentage of total loans | 50.60% | 47.70%
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 482,931 | $ 505,680
Total consumer and other percentage of total loans | 2.90% | 2.90%

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