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Loans - Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial and industrial | $ 4,184,960 | $ 4,120,522
Total energy | 1,656,360 | 1,758,195
Commercial mortgages | 3,351,533 | 3,285,041
Construction | 752,916 | 720,695
Land | 282,354 | 286,991
Total commercial real estate | 4,386,803 | 4,292,727
Home equity loans | 341,327 | 340,528
Home equity lines of credit | 236,290 | 233,525
Other | 302,611 | 306,696
Total consumer real estate | 880,228 | 880,749
Total real estate | 5,267,031 | 5,173,476
Consumer and other | 433,684 | 434,338
Total loans | $ 11,542,035 | $ 11,486,531
Total commercial and industrial percentage of total loans | 36.30% | 35.90%
Percentage of total energy loans to total loans | 14.40% | 15.30%
Commercial mortgages percentage of total loans | 29.00% | 28.60%
Construction percentage of total loans | 6.50% | 6.30%
Land percentage of total loans | 2.50% | 2.50%
Total commercial real estate percentage of total loans | 38.00% | 37.40%
Home equity loans percentage of total loans | 3.00% | 3.00%
Home equity lines of credit percentage of total loans | 2.00% | 2.00%
Other percentage of total loans | 2.60% | 2.60%
Total consumer real estate percentage of total loans | 7.60% | 7.60%
Total real estate percentage of total loans | 45.60% | 45.00%
Total consumer and other percentage of total loans | 3.70% | 3.80%
Total loans percentage | 100.00% | 100.00%
Energy Production [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total energy | $ 1,175,149 | $ 1,249,678
Percentage of energy production loans to total loans | 10.20% | 10.90%
Energy Service [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total energy | $ 251,147 | $ 272,934
Percentage of energy service loans to total loans | 2.20% | 2.40%
Energy Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total energy | $ 230,064 | $ 235,583
Percentage of other energy loans to total loans | 2.00% | 2.00%

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- Definition Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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