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Loans - Unallocated Portion of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 149,773 | $ 149,714 | $ 135,859 | $ 110,373 | $ 106,607 | $ 99,542
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 7,785 |  | 4,378 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 141,988 |  | 131,481 |  |  |
Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 93,896 |  | 77,089 |  |  |
Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,785 |  | 4,378 |  |  |
General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 15,004 |  | 12,603 |  |  |
Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 33,088 |  | 41,789 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 49,131 | 47,578 | 42,993 | 43,219 | 42,425 | 44,273
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 4,410 |  | 2,378 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 44,721 |  | 40,615 |  |  |
Commercial Portfolio Segment [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 31,026 |  | 25,428 |  |  |
Commercial Portfolio Segment [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,410 |  | 2,378 |  |  |
Commercial Portfolio Segment [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,957 |  | 7,339 |  |  |
Commercial Portfolio Segment [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,738 |  | 7,848 |  |  |
Commercial and industrial, Energy [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 62,243 | 66,339 | 54,696 | 27,584 | 26,300 | 14,919
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 2,500 |  | 2,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 59,743 |  | 52,696 |  |  |
Commercial and industrial, Energy [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 39,689 |  | 21,195 |  |  |
Commercial and industrial, Energy [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,500 |  | 2,000 |  |  |
Commercial and industrial, Energy [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 3,164 |  | 5,525 |  |  |
Commercial and industrial, Energy [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 16,890 |  | 25,976 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 29,217 | 27,063 | 24,313 | 25,883 | 24,935 | 27,163
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 875 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 28,342 |  | 24,313 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 16,403 |  | 15,544 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 875 |  | 0 |  |  |
Commercial Real Estate Portfolio Segment [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,488 |  | 4,619 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 7,451 |  | 4,150 |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,167 | 3,935 | 4,659 | 4,804 | 4,702 | 5,178
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 4,167 |  | 4,659 |  |  |
Consumer Real Estate [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 2,237 |  | 2,109 |  |  |
Consumer Real Estate [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer Real Estate [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 1,450 |  | 2,052 |  |  |
Consumer Real Estate [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 480 |  | 498 |  |  |
Consumer and Other [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 5,015 | $ 4,799 | 9,198 | $ 8,883 | $ 8,245 | $ 8,009
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 5,015 |  | 9,198 |  |  |
Consumer and Other [Member] | Historical Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 4,541 |  | 12,813 |  |  |
Consumer and Other [Member] | Specific Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | 0 |  | 0 |  |  |
Consumer and Other [Member] | General Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | (55) |  | (6,932) |  |  |
Consumer and Other [Member] | Macroeconomic Valuation Allowances [Member] |  |  |  |  |  |
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items] |  |  |  |  |  |
Portion of allowance for loan losses | $ 529 |  | $ 3,317 |  |  |

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