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Loans (Weighted Average Risk Grades for All Commercial Loans b Class) (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) Grade | Dec. 31, 2015 USD ($) Grade
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 4,344,000 | $ 4,120,522
Loans | 4,835,448 | 4,292,727
Loans | $ 1,043,261 | $ 720,695
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.35 | 6.13
Loans | $ 4,344,000 | $ 4,120,522
Commercial and Industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.95 | 6.89
Loans | $ 1,386,061 | $ 1,758,195
Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.95 | 6.85
Loans | $ 3,792,187 | $ 3,572,032
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 7.01 | 7.01
Loans | $ 1,043,261 | $ 720,695
Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.01 | 5.88
Loans | $ 3,989,722 | $ 3,869,203
Risk Grade One To Eight [Member] | Commercial and Industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.34 | 6.12
Loans | $ 854,688 | $ 1,385,749
Risk Grade One To Eight [Member] | Commercial Real Estate, Buildings, Land and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.67 | 6.58
Loans | $ 3,463,064 | $ 3,280,435
Risk Grade One To Eight [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 6.97 | 6.91
Loans | $ 1,023,194 | $ 696,229
Risk Grade Nine [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans | $ 106,988 | $ 100,670
Risk Grade Nine [Member] | Commercial and Industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans | $ 78,524 | $ 212,250
Risk Grade Nine [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 | $ 109,110 | $ 140,900
Risk Grade Nine [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 9.00 | 9.00
Loans | $ 15,829 | $ 13,074
Risk Grade Ten [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans | $ 115,420 | $ 76,030
Risk Grade Ten [Member] | Commercial and Industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans | $ 150,872 | $ 62,163
Risk Grade Ten [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 | $ 145,067 | $ 72,577
Risk Grade Ten [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 10.00 | 10.00
Loans | $ 2,889 | $ 2,757
Risk Grade Eleven [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans | $ 100,245 | $ 49,508
Risk Grade Eleven [Member] | Commercial and Industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans | $ 244,406 | $ 76,853
Risk Grade Eleven [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 | $ 66,396 | $ 43,601
Risk Grade Eleven [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 11.00 | 11.00
Loans | $ 1,349 | $ 8,066
Risk Grade Twelve [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans | $ 25,939 | $ 22,644
Risk Grade Twelve [Member] | Commercial and Industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans | $ 53,821 | $ 19,180
Risk Grade Twelve [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 | $ 8,550 | $ 34,519
Risk Grade Twelve [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 12.00 | 12.00
Loans | $ 0 | $ 569
Risk Grade Thirteen [Member] | Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans | $ 5,686 | $ 2,467
Risk Grade Thirteen [Member] | Commercial and Industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans | $ 3,750 | $ 2,000
Risk Grade Thirteen [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 Thirteen [Member] | Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 13.00 | 13.00
Loans | $ 0 | $ 0
Minimum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 1.00 | 1.00
Maximum [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Weighted Average Risk Grade | Grade | 8.00 | 8.00

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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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