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Loans (Net (Charge-Offs)/Recoveries, Segregated by Class of Loans) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | $ (34,487) | $ (15,528) | $ (9,210)
Commercial Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | (12,259) | (6,535) | (2,911)
Commercial and Industrial, Energy [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | (18,588) | (5,997) | (1,237)
Commercial Real Estate, Buildings, Land and Other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | 813 | 314 | (2,348)
Construction Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | 23 | 18 | 348
Residential Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | (257) | (91) | (733)
Consumer Portfolio Segment [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | $ (4,219) | $ (3,237) | $ (2,329)

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