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Loans - Impaired Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 133,508 | $ 113,188
Recorded Investment With No Allowance | 79,450 | 55,172
Recorded Investment With Allowance | 31,089 | 38,851
Total Recorded Investment | 110,539 | 94,023
Related Allowance | 3,601 | 9,186
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 35,005 | 40,288
Recorded Investment With No Allowance | 18,113 | 19,862
Recorded Investment With Allowance | 5,763 | 9,047
Total Recorded Investment | 23,876 | 28,909
Related Allowance | 2,751 | 5,436
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 84,912 | 60,522
Recorded Investment With No Allowance | 53,313 | 27,759
Recorded Investment With Allowance | 25,326 | 29,804
Total Recorded Investment | 78,639 | 57,563
Related Allowance | 850 | 3,750
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 11,635 | 11,369
Recorded Investment With No Allowance | 6,453 | 6,866
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 6,453 | 6,866
Related Allowance | 0 | 0
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 0 | 0
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 0 | 0
Related Allowance | 0 | 0
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 1,881 | 977
Recorded Investment With No Allowance | 1,548 | 655
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 1,548 | 655
Related Allowance | 0 | 0
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 75 | 32
Recorded Investment With No Allowance | 23 | 30
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 23 | 30
Related Allowance | $ 0 | $ 0

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