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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 108,591 |
Current Loans | 11,472,819 |
Total loans | 11,581,410 | $ 11,486,531
Accruing Loans 90 or More Days Past Due | 20,862 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 33,232 |
Current Loans | 4,131,682 |
Total loans | 4,164,914 |
Accruing Loans 90 or More Days Past Due | 7,590 |
Commercial and industrial, Energy [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 27,557 |
Current Loans | 1,357,350 |
Total loans | 1,384,907 |
Accruing Loans 90 or More Days Past Due | 5,294 |
Commercial real estate, Buildings, land and other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 31,720 |
Current Loans | 3,695,399 |
Total loans | 3,727,119 |
Accruing Loans 90 or More Days Past Due | 5,863 |
Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,919 |
Current Loans | 908,864 |
Total loans | 911,783 |
Accruing Loans 90 or More Days Past Due | 0 |
Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 7,591 |
Current Loans | 921,666 |
Total loans | 929,257 |
Accruing Loans 90 or More Days Past Due | 993 |
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,572 |
Current Loans | 457,858 |
Total loans | 463,430 |
Accruing Loans 90 or More Days Past Due | 1,122 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 63,339 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 8,751 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial and industrial, Energy [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 19,489 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Commercial real estate, Buildings, land and other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 22,273 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,593 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,924 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,309 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 45,252 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 24,481 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial, Energy [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 8,068 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate, Buildings, land and other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 9,447 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 326 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,667 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 1,263 |

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