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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) Grade | Dec. 31, 2016 USD ($) Grade
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 4,402,276 | $ 4,344,000
Loans | 4,988,784 | 4,835,448
Loans | $ 1,063,894 | $ 1,043,261
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.38 | 6.35
Loans | $ 4,402,276 | $ 4,344,000
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.86 | 7.95
Loans | $ 1,362,556 | $ 1,386,061
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.96 | 6.95
Loans | $ 3,924,890 | $ 3,792,187
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.12 | 7.01
Loans | $ 1,063,894 | $ 1,043,261
Risk grades 1-8 [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.00 | 6.01
Loans | $ 3,981,338 | $ 3,989,722
Risk grades 1-8 [Member] | Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.33 | 6.34
Loans | $ 876,206 | $ 854,688
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 | 6.69 | 6.67
Loans | $ 3,605,460 | $ 3,463,064
Risk grades 1-8 [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.06 | 6.97
Loans | $ 1,037,166 | $ 1,023,194
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 | $ 194,639 | $ 106,988
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 | $ 55,136 | $ 78,524
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 | $ 107,441 | $ 109,110
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 | $ 21,193 | $ 15,829
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 | $ 87,107 | $ 115,420
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 | $ 152,360 | $ 150,872
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 | $ 132,850 | $ 145,067
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 | $ 446 | $ 2,889
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 | $ 112,511 | $ 100,245
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 | $ 199,479 | $ 244,406
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 | $ 71,531 | $ 66,396
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 | $ 5,089 | $ 1,349
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 | $ 23,681 | $ 25,939
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 | $ 78,525 | $ 53,821
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 | $ 7,608 | $ 8,550
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 | $ 0 | $ 0
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 | $ 3,000 | $ 5,686
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 | $ 850 | $ 3,750
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 | $ 0 | $ 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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