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Loans - Impaired Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | $ 188,528 | $ 89,981
Recorded Investment With No Allowance | 80,951 | 60,944
Recorded Investment With Allowance | 90,869 | 16,534
Total Recorded Investment | 171,820 | 77,478
Related Allowance | 30,302 | 4,378
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 27,980 | 26,067
Recorded Investment With No Allowance | 20,367 | 18,776
Recorded Investment With Allowance | 4,390 | 4,084
Total Recorded Investment | 24,757 | 22,860
Related Allowance | 2,852 | 2,378
Commercial and industrial, Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 122,242 | 25,240
Recorded Investment With No Allowance | 27,612 | 8,689
Recorded Investment With Allowance | 86,479 | 12,450
Total Recorded Investment | 114,091 | 21,139
Related Allowance | 27,450 | 2,000
Commercial real estate, Buildings, land and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 36,348 | 37,126
Recorded Investment With No Allowance | 31,545 | 32,425
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 31,545 | 32,425
Related Allowance | 0 | 0
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 1,218 | 793
Recorded Investment With No Allowance | 970 | 569
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 970 | 569
Related Allowance | 0 | 0
Consumer Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unpaid Contractual Principal Balance | 740 | 755
Recorded Investment With No Allowance | 457 | 485
Recorded Investment With Allowance | 0 | 0
Total Recorded Investment | 457 | 485
Related Allowance | 0 | 0
Consumer and Other [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

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