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Loans - Impaired Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 98,394 | $ 89,981
Recorded Investment With No Allowance | 61,588 | 60,944
Recorded Investment With Allowance | 16,341 | 16,534
Total Recorded Investment | 77,929 | 77,478
Related Allowance | 8,102 | 4,378
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 32,079 | 26,067
Recorded Investment With No Allowance | 18,723 | 18,776
Recorded Investment With Allowance | 6,251 | 4,084
Total Recorded Investment | 24,974 | 22,860
Related Allowance | 4,727 | 2,378
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 51,030 | 25,240
Recorded Investment With No Allowance | 34,217 | 8,689
Recorded Investment With Allowance | 8,410 | 12,450
Total Recorded Investment | 42,627 | 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 | 14,131 | 37,126
Recorded Investment With No Allowance | 7,840 | 32,425
Recorded Investment With Allowance | 1,680 | 0
Total Recorded Investment | 9,520 | 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 | 725 | 755
Recorded Investment With No Allowance | 428 | 485
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 428 | 485
Related Allowance | 0 | 0
Consumer and Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 103 | 0
Recorded Investment With No Allowance | 54 | 0
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 54 | 0
Related Allowance | $ 0 | $ 0

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