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Loans - Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial and industrial | $ 5,179,780 | $ 5,111,957
Energy: | 1,546,918 | 1,602,598
Commercial mortgages | 4,555,171 | 4,121,966
Construction | 1,370,206 | 1,267,717
Land | 290,706 | 306,755
Total commercial real estate | 6,216,083 | 5,696,438
Home equity loans | 363,224 | 353,924
Home equity lines of credit | 350,461 | 337,168
Other | 458,618 | 427,898
Total consumer real estate | 1,172,303 | 1,118,990
Total real estate | 7,388,386 | 6,815,428
Consumer and other | 519,844 | 569,750
Total loans | $ 14,634,928 | $ 14,099,733
Total commercial and industrial percentage of total loans | 35.40% | 36.30%
Percentage of total energy loans to total loans | 10.50% | 11.40%
Commercial mortgages percentage of total loans | 31.10% | 29.20%
Construction percentage of total loans | 9.40% | 9.00%
Land percentage of total loans | 2.00% | 2.20%
Total commercial real estate percentage of total loans | 42.50% | 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 | 50.50% | 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: | $ 1,282,180 | $ 1,309,314
Percentage of energy production loans to total loans | 8.70% | 9.30%
Energy Service [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Energy: | $ 189,350 | $ 168,775
Percentage of energy service loans to total loans | 1.30% | 1.20%
Energy Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Energy: | $ 75,388 | $ 124,509
Percentage of other energy loans to total loans | 0.50% | 0.90%

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