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Loans - Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | $ 5,876,899 | $ 5,767,743 | $ 5,510,887
Commercial mortgages | 3,222,107 | 3,080,202 |
Construction | 718,991 | 629,988 |
Land | 280,749 | 291,907 |
Total commercial real estate | 4,221,847 | 4,002,097 | 4,020,478
Home equity loans | 339,336 | 342,725 |
Home equity lines of credit | 226,874 | 220,128 |
Other | 305,460 | 286,198 |
Total consumer real estate | 871,670 | 849,051 | 847,068
Total real estate | 5,093,517 | 4,851,148 |
Consumer installment | 408,928 | 385,479 |
Other | 4,044 | 8,122 |
Total consumer and other | 412,972 | 393,601 | 391,480
Unearned discounts | (24,438) | (24,957) | (23,147)
Total loans | $ 11,358,950 | $ 10,987,535 | $ 10,746,766
Total commercial and industrial percentage of total loans | 51.70% | 52.50% |
Commercial mortgages percentage of total loans | 28.40% | 28.00% |
Construction percentage of total loans | 6.30% | 5.70% |
Land percentage of total loans | 2.50% | 2.70% |
Total commercial real estate percentage of total loans | 37.20% | 36.40% |
Home equity loans percentage of total loans | 3.00% | 3.10% |
Home equity lines of credit percentage of total loans | 2.00% | 2.00% |
Other percentage of total loans | 2.70% | 2.60% |
Total consumer real estate percentage of total loans | 7.70% | 7.70% |
Total real estate percentage of total loans | 44.90% | 44.10% |
Consumer installment percentage of total loans | 3.60% | 3.50% |
Other percentage of total loans | 0.00% | 0.10% |
Total consumer and other percentage of total loans | 3.60% | 3.60% |
Unearned discounts percentage of total loans | (0.20%) | (0.20%) |
Total loans percentage | 100.00% | 100.00% |
Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | $ 5,533,383 | $ 5,429,206 |
Total commercial and industrial percentage of total loans | 48.70% | 49.40% |
Leases [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | $ 343,516 | $ 338,537 |
Total commercial and industrial percentage of total loans | 3.00% | 3.10% |

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- Definition Amount before allowance of revolving, open-end loan, extended under a line of credit and secured by the borrower's residential property. 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 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: 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)(3),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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