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Loans - Net (Charge-Offs)/Recoveries, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | $ (6,371) | $ (15,298) | $ (20,977) | $ (35,632)
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | (1,520) | (7,807) | (5,912) | (19,030)
Commercial and industrial, Energy [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | (1,260) | (5,347) | (3,184) | (10,272)
Commercial real estate, Buildings, land and other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | 38 | 33 | (466) | (288)
Construction Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | 8 | 3 | 14 | 11
Consumer Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | (103) | (388) | (2,078) | (1,078)
Consumer and Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
(Net charge-offs)/Recoveries | $ (3,534) | $ (1,792) | $ (9,351) | $ (4,975)

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