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Loans - Age Analysis of Past Due Loans, Segregated by Class of Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 103,087 |
Current Loans | 12,082,558 |
Total loans | 12,185,645 | $ 11,975,392
Accruing Loans 90 or More Days Past Due | 6,814 |
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 44,353 |
Current Loans | 4,357,923 |
Total loans | 4,402,276 |
Accruing Loans 90 or More Days Past Due | 3,014 |
Commercial and industrial, Energy [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 32,408 |
Current Loans | 1,330,148 |
Total loans | 1,362,556 |
Accruing Loans 90 or More Days Past Due | 628 |
Commercial real estate, Buildings, land and other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 11,457 |
Current Loans | 3,913,433 |
Total loans | 3,924,890 |
Accruing Loans 90 or More Days Past Due | 1,834 |
Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,228 |
Current Loans | 1,061,666 |
Total loans | 1,063,894 |
Accruing Loans 90 or More Days Past Due | 113 |
Consumer Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 7,375 |
Current Loans | 941,601 |
Total loans | 948,976 |
Accruing Loans 90 or More Days Past Due | 695 |
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 5,266 |
Current Loans | 477,787 |
Total loans | 483,053 |
Accruing Loans 90 or More Days Past Due | 530 |
Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 41,608 |
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 | 20,566 |
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 | 2,941 |
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 | 6,243 |
Financing Receivables, 30 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,115 |
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 | 5,145 |
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 | 4,598 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 61,479 |
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 | 23,787 |
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 | 29,467 |
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 | 5,214 |
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 | 113 |
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 | 2,230 |
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 | $ 668 |

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