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Loans - Net (Charge-Offs)/Recoveries, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | $ (21,355) | $ (1,974) | $ (23,834) | $ (3,970)
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | (3,966) | (1,683) | (5,098) | (2,535)
Commercial and industrial, Energy [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | (16,747) | 1 | (17,758) | 3
Commercial real estate, Buildings, land and other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | 481 | 279 | 542 | (28)
Construction Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | 2 | 15 | 9 | 16
Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | 74 | 81 | 173 | 53
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | $ (1,199) | $ (667) | $ (1,702) | $ (1,479)

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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 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(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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