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Loans - Non-Accrual Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | $ 96,833 | $ 83,467
Commercial Portfolio Segment [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 32,010 | 25,111
Commercial and industrial, Energy [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 51,397 | 21,180
Commercial real estate, Buildings, land and other [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 10,058 | 34,519
Construction Loans [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 547 | 569
Consumer Real Estate [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | 2,488 | 1,862
Consumer and Other [Member] |  |
Non Accrual Loans Segregated By Class Of Loans [Line Items] |  |
Non-accrual loans | $ 333 | $ 226

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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524 + Details
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