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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) Grade | Dec. 31, 2015 USD ($) Grade
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 4,253,822 | $ 4,120,522
Loans | 4,475,617 | 4,292,727
Loans | $ 804,341 | $ 720,695
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.25 | 6.13
Loans | $ 4,253,822 | $ 4,120,522
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 8.07 | 6.89
Loans | $ 1,503,608 | $ 1,758,195
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.89 | 6.85
Loans | $ 3,671,276 | $ 3,572,032
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.08 | 7.01
Loans | $ 804,341 | $ 720,695
Risk grades 1-8 [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 5.95 | 5.88
Loans | $ 3,953,406 | $ 3,869,203
Risk grades 1-8 [Member] | Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.19 | 6.12
Loans | $ 812,591 | $ 1,385,749
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 | 6.62 | 6.58
Loans | $ 3,375,360 | $ 3,280,435
Risk grades 1-8 [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.05 | 6.91
Loans | $ 794,323 | $ 696,229
Risk grade 9 [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans | $ 98,610 | $ 100,670
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 | $ 124,776 | $ 212,250
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 | $ 122,532 | $ 140,900
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 | $ 7,818 | $ 13,074
Risk grade 10 [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans | $ 88,370 | $ 76,030
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 | $ 295,723 | $ 62,163
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 | $ 77,356 | $ 72,577
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 | $ 1,598 | $ 2,757
Risk grade 11 [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans | $ 85,456 | $ 49,508
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 | $ 227,763 | $ 76,853
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 | $ 84,559 | $ 43,601
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 | $ 51 | $ 8,066
Risk grade 12 [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans | $ 23,041 | $ 22,644
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 | $ 40,255 | $ 19,180
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 | $ 10,594 | $ 34,519
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 | $ 551 | $ 569
Risk grade 13 [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans | $ 4,939 | $ 2,467
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 | $ 2,500 | $ 2,000
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 | $ 875 | $ 0
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=66008989&loc=d3e5066-111524 + Details
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- Definition Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans 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 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524 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)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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