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Loans - Loans (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | $ 5,624,833 | $ 4,907,076 | $ 4,772,617
Commercial mortgages | 2,985,184 | 2,800,760 |
Construction | 577,446 | 426,639 |
Land | 272,959 | 239,937 |
Total commercial real estate | 3,835,589 | 3,467,336 | 3,371,268
Home equity loans | 336,890 | 329,853 |
Home equity lines of credit | 213,109 | 195,132 |
1-4 family residential mortgages | 35,625 | 32,447 |
Construction | 21,506 | 13,123 |
Other | 256,085 | 237,649 |
Total consumer real estate | 863,215 | 808,204 | 785,205
Total real estate | 4,698,804 | 4,275,540 |
Consumer installment | 371,648 | 350,827 |
Other | 6,581 | 7,289 |
Total consumer and other | 378,229 | 358,116 | 325,322
Unearned discounts | (22,489) | (25,032) | (21,869)
Total loans | 10,679,377 | 9,515,700 | 9,232,543
Total commercial and industrial percentage of total loans | 52.70% | 51.60% |
Commercial mortgages percentage of total loans | 28.00% | 29.40% |
Construction percentage of total loans | 5.40% | 4.50% |
Land percentage of total loans | 2.50% | 2.50% |
Total commercial real estate percentage of total loans | 35.90% | 36.40% |
Home equity loans percentage of total loans | 3.20% | 3.50% |
Home equity lines of credit percentage of total loans | 2.00% | 2.10% |
1-4 family residential mortgages percentage of total loans | 0.30% | 0.30% |
Construction percentage of total loans | 0.20% | 0.10% |
Other percentage of total loans | 2.40% | 2.50% |
Total consumer real estate percentage of total loans | 8.10% | 8.50% |
Total real estate percentage of total loans | 44.00% | 44.90% |
Consumer installment percentage of total loans | 3.40% | 3.70% |
Other percentage of total loans | 0.10% | 0.10% |
Total consumer and other percentage of total loans | 3.50% | 3.80% |
Unearned discounts percentage of total loans | (0.20%) | (0.30%) |
Total loans percentage | 100.00% | 100.00% |
Commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | 5,322,752 | 4,587,499 |
Total commercial and industrial percentage of total loans | 49.90% | 48.20% |
Leases [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and industrial: | $ 302,081 | $ 319,577 |
Total commercial and industrial percentage of total loans | 2.80% | 3.40% |

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