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Loans - Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial and industrial | $ 5,380,487 | $ 5,111,957
Energy: | 1,481,349 | 1,602,598
Commercial mortgages | 4,291,781 | 4,121,966
Construction | 1,323,040 | 1,267,717
Land | 299,435 | 306,755
Total commercial real estate | 5,914,256 | 5,696,438
Home equity loans | 356,754 | 353,924
Home equity lines of credit | 349,061 | 337,168
Other | 453,083 | 427,898
Total consumer real estate | 1,158,898 | 1,118,990
Total real estate | 7,073,154 | 6,815,428
Consumer and other | 524,159 | 569,750
Total loans | $ 14,459,149 | $ 14,099,733
Total commercial and industrial percentage of total loans | 37.20% | 36.30%
Percentage of total energy loans to total loans | 10.20% | 11.40%
Commercial mortgages percentage of total loans | 29.70% | 29.20%
Construction percentage of total loans | 9.20% | 9.00%
Land percentage of total loans | 2.10% | 2.20%
Total commercial real estate percentage of total loans | 41.00% | 40.40%
Home equity loans percentage of total loans | 2.50% | 2.50%
Home equity lines of credit percentage of total loans | 2.40% | 2.40%
Other percentage of total loans | 3.10% | 3.00%
Total consumer real estate percentage of total loans | 8.00% | 7.90%
Total real estate percentage of total loans | 49.00% | 48.30%
Total consumer and other percentage of total loans | 3.60% | 4.00%
Total loans percentage | 100.00% | 100.00%
Energy Production [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Energy: | $ 1,197,717 | $ 1,309,314
Percentage of energy production loans to total loans | 8.30% | 9.30%
Energy Service [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Energy: | $ 173,473 | $ 168,775
Percentage of energy service loans to total loans | 1.20% | 1.20%
Energy Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Energy: | $ 110,159 | $ 124,509
Percentage of other energy loans to total loans | 0.70% | 0.90%

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