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Loans - Impaired Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 106,771 | $ 89,981
Recorded Investment With No Allowance | 74,504 | 60,944
Recorded Investment With Allowance | 15,058 | 16,534
Total Recorded Investment | 89,562 | 77,478
Related Allowance | 7,785 | 4,378
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 38,174 | 26,067
Recorded Investment With No Allowance | 23,709 | 18,776
Recorded Investment With Allowance | 5,159 | 4,084
Total Recorded Investment | 28,868 | 22,860
Related Allowance | 4,410 | 2,378
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 54,251 | 25,240
Recorded Investment With No Allowance | 43,080 | 8,689
Recorded Investment With Allowance | 8,298 | 12,450
Total Recorded Investment | 51,378 | 21,139
Related Allowance | 2,500 | 2,000
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 13,007 | 37,126
Recorded Investment With No Allowance | 6,686 | 32,425
Recorded Investment With Allowance | 1,601 | 0
Total Recorded Investment | 8,287 | 32,425
Related Allowance | 875 | 0
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 326 | 793
Recorded Investment With No Allowance | 326 | 569
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 326 | 569
Related Allowance | 0 | 0
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 971 | 755
Recorded Investment With No Allowance | 662 | 485
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 662 | 485
Related Allowance | 0 | 0
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 42 | 0
Recorded Investment With No Allowance | 41 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 41 | 0
Related Allowance | $ 0 | $ 0

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