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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) Grade | Dec. 31, 2014 USD ($) Grade | Sep. 30, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 5,876,899 | $ 5,767,743 | $ 5,510,887
Loans | 4,221,847 | 4,002,097 | $ 4,020,478
Loans | $ 718,991 | $ 629,988 |
Commercial and industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 6.50 | 5.45 |
Loans | $ 1,788,508 | $ 1,773,945 |
Commercial and industrial, Other commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 6.15 | 6.16 |
Loans | $ 4,088,391 | $ 3,993,798 |
Commercial real estate, Buildings, land and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 6.84 | 6.76 |
Loans | $ 3,502,856 | $ 3,372,109 |
Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 6.89 | 6.97 |
Loans | $ 718,991 | $ 629,988 |
Risk grades 1-8 [Member] | Commercial and industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 6.01 | 5.37 |
Loans | $ 1,576,300 | $ 1,740,455 |
Risk grades 1-8 [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 5.91 | 5.93 |
Loans | $ 3,850,675 | $ 3,785,171 |
Risk grades 1-8 [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 6.59 | 6.53 |
Loans | $ 3,229,737 | $ 3,148,339 |
Risk grades 1-8 [Member] | Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 6.86 | 6.91 |
Loans | $ 711,523 | $ 617,805 |
Risk grade 9 [Member] | Commercial and industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00 |
Loans | $ 70,893 | $ 27,313 |
Risk grade 9 [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00 |
Loans | $ 96,444 | $ 65,166 |
Risk grade 9 [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00 |
Loans | $ 127,132 | $ 72,906 |
Risk grade 9 [Member] | Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00 |
Loans | $ 3,463 | $ 8,003 |
Risk grade 10 [Member] | Commercial and industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00 |
Loans | $ 56,139 | $ 161 |
Risk grade 10 [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00 |
Loans | $ 62,346 | $ 54,519 |
Risk grade 10 [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00 |
Loans | $ 69,812 | $ 87,889 |
Risk grade 10 [Member] | Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00 |
Loans | $ 3,379 | $ 1,323 |
Risk grade 11 [Member] | Commercial and industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00 |
Loans | $ 71,967 | $ 5,380 |
Risk grade 11 [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00 |
Loans | $ 53,739 | $ 55,034 |
Risk grade 11 [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00 |
Loans | $ 61,461 | $ 43,336 |
Risk grade 11 [Member] | Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00 |
Loans | $ 383 | $ 64 |
Risk grade 12 [Member] | Commercial and industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00 |
Loans | $ 13,209 | $ 636 |
Risk grade 12 [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00 |
Loans | $ 23,405 | $ 31,683 |
Risk grade 12 [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00 |
Loans | $ 14,643 | $ 19,501 |
Risk grade 12 [Member] | Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00 |
Loans | $ 243 | $ 2,793 |
Risk grade 13 [Member] | Commercial and industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00 |
Loans | $ 0 | $ 0 |
Risk grade 13 [Member] | Commercial and industrial, Other commercial [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00 |
Loans | $ 1,782 | $ 2,225 |
Risk grade 13 [Member] | Commercial real estate, Buildings, land and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00 |
Loans | $ 71 | $ 138 |
Risk grade 13 [Member] | Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00 |
Loans | $ 0 | $ 0 |

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- Definition Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans 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)(1)) -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 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5066-111524 + Details
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